Construction Calculators — Concrete, Roofing, Flooring &amp; More

Concrete Calculator

Calculate how much concrete you need for slabs, footings, and columns. Get results in cubic feet, cubic yards, and ready-mix bags (60 lb & 80 lb).

Concrete Block Calculator

Calculate how many concrete blocks (CMU) you need for a wall. Enter wall dimensions and block size to get total blocks with 5% waste, mortar bags, grout fill, and cost estimate. Supports standard and custom sizes.

Flooring Calculator

Calculate how much flooring material you need for any room. Enter dimensions and waste factor to get total square footage, boxes, and cost estimate.

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Tile Calculator

Calculate how many tiles you need for floors or walls. Enter area and tile size with gap width to get total tiles, boxes, and grout needed.

Roofing Calculator

Calculate roofing materials needed for your project. Enter roof dimensions and pitch to get total squares, shingle bundles, and underlayment rolls.

Roof Pitch Calculator

Calculate roof pitch from rise and run. Get pitch ratio, angle in degrees, slope percentage, rafter multiplier, roof classification, and walkability rating. Choose from 7 common presets or enter custom values.

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Paint Calculator

Calculate how many gallons of paint you need for any room or exterior. Choose paint type, add ceiling and trim, include primer coats, and get a cost estimate. Supports 8 finishes and custom coverage.

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Drywall Calculator

Calculate drywall sheets needed for walls and ceilings. Choose from 5 drywall types and 3 sheet sizes. Get sheets with 10% waste, joint tape, compound, screws, weight, and total cost estimate.

Square Footage Calculator for Construction (Sq Ft & Area Tool)

Calculate square footage instantly for rooms, plots, and construction projects. Get accurate area in sq ft, sq m, and more with this easy-to-use calculator.

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Cubic Yards Calculator

Calculate cubic yards for gravel, mulch, topsoil, sand, concrete, or fill dirt. Choose rectangular or cylinder shape, select material for weight estimate, and get cost per cubic yard.

Gravel Calculator

Calculate how much gravel you need for driveways, paths, and landscaping. Choose from 8 gravel types, get weight in tons with compaction factor, and estimate total cost with delivery.

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Mulch Calculator

Calculate how much mulch you need for garden beds and landscaping. Choose from 8 mulch types, compare bagged vs. bulk cost, and get bag count with 10% overage.

Brick Calculator

Calculate how many bricks and mortar bags you need for walls, patios, or walkways. Choose from 6 brick sizes, estimate pallets, and get total material cost.

Fence Calculator

Calculate fence materials — posts, rails, pickets, panels, concrete, and screws. Choose from 7 fence styles with auto-presets and get a complete cost estimate.

Deck Calculator

Calculate decking materials — boards, joists, screws, and posts needed for your deck. Enter dimensions and board width for a complete material list.

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Staircase Calculator

Calculate staircase dimensions — number of steps, riser height, tread depth, and stringer length from total rise and run measurements.

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Lumber Calculator

Calculate board feet, weight, and cost for any lumber purchase. Choose from 11 wood species with density data and 8 dimensional lumber presets.

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Insulation Calculator

Calculate how much insulation you need for walls, attics, and floors. Get batt rolls or blown-in bags based on area and R-value requirements.

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Carpet Calculator

Calculate carpet, padding, and installation cost for any room. Choose from 6 carpet types with pricing, roll width, and seam estimation.

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Sand Calculator

Calculate how much sand you need for construction, landscaping, or filling projects. Get volume in cubic yards, tons, and bags needed.

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Topsoil Calculator

Calculate how much topsoil you need for gardens, lawns, and raised beds. Get volume in cubic yards, tons, and number of bags needed.

Retaining Wall Calculator

Calculate blocks, cap stones, and gravel backfill needed for a retaining wall. Enter wall length, height, and block dimensions for a complete material list.

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Asphalt Calculator

Calculate how much asphalt you need for driveways, parking lots, and roads. Get results in tons, cubic yards, and truckloads.

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Rebar Calculator

Calculate rebar needed for concrete slabs and footings. Get total bars, linear feet, and weight by bar size and spacing.

Siding Calculator

Calculate how much siding you need for your home exterior. Accounts for doors, windows, and gable ends to estimate squares of siding material.

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Gutter Calculator

Calculate gutters, downspouts, brackets, and elbows needed for your roof. Enter roof edge measurements for a complete material list.

Paver Calculator

Calculate how many pavers you need for patios, walkways, and driveways. Includes base material and joint sand estimates.

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Wallpaper Calculator

Calculate how many rolls of wallpaper you need for any room. Accounts for doors, windows, and pattern repeat to minimize waste.

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Pool Volume Calculator

Calculate the water volume of your swimming pool in gallons and liters. Supports rectangular, round, and oval pool shapes with variable depth.

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Fill Dirt Calculator

Calculate how much fill dirt you need for grading, backfilling, and leveling. Get volume in cubic yards, tons, and truckloads with compaction factor.

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Soil Amendment Calculator

Calculate how much soil amendment (lime, sulfur, gypsum, compost) to add based on your soil area and desired application rate.

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Concrete Stairs Calculator

Calculate the volume of concrete needed for poured stairs. Enter total rise, tread dimensions, and stair width for cubic yards and bags.

Aggregate Calculator

Calculate aggregate needed for sub-bases, drainage, and concrete mixing. Get cubic yards, tons, and cost by aggregate type.

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Column Calculator

Calculate concrete volume for round or square columns and footings. Get cubic feet, cubic yards, and bag counts for pier foundations.

Board & Batten Calculator

Calculate boards and battens needed for walls, siding, or accent features. Enter wall dimensions, board width, and batten width.

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Drainage Calculator

Calculate French drain materials — perforated pipe, gravel fill, and landscape fabric for drainage projects by trench dimensions.

Plywood Calculator

Calculate plywood sheets needed for floors, walls, roofs, or cabinets. Choose from 6 plywood types, 5 thicknesses, and get weight and cost estimates.

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Ceiling Tile Calculator

Calculate drop ceiling tiles, main runners, cross tees, and wall angle needed for suspended ceiling installations.

Gabion Wall Calculator

Calculate gabion baskets and rock fill needed for retaining walls and landscape features. Enter wall dimensions and basket specifications.

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Post Hole Calculator

Calculate concrete needed for post holes — enter hole diameter, depth, and number of posts for total cubic feet and bag counts.

Mortar Calculator

Calculate mortar mix needed for brick, block, or stone projects. Get bags of mortar mix by wall area and joint thickness.

Concrete Footing Calculator

Calculate concrete volume for continuous wall footings. Enter footing length, width, and depth for cubic yards and bag counts.

Landscape Rock Calculator

Calculate decorative landscape rock, river rock, or boulders needed for gardens and yards. Get tons, cubic yards, and coverage area.

Roof Truss Calculator

Calculate the number of roof trusses needed for a building. Enter building length and truss spacing for total count and lumber estimates.

Wainscoting Calculator

Calculate wainscoting panels, rails, stiles, and trim needed for any room. Enter room dimensions and panel specifications.

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Grading Calculator

Calculate cut and fill volumes for land grading and leveling. Enter existing and desired elevations for cubic yards of earthwork.

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Stucco Calculator

Calculate stucco mix, lath, and supplies needed for exterior or interior walls. Accounts for doors, windows, and multiple coat thicknesses.

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Rain Barrel Calculator

Calculate rainwater harvest potential from your roof area. Get gallons collected per inch of rain and number of barrels needed.

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Concrete Curb Calculator

Calculate concrete volume for curbs and landscape edging. Enter curb length, height, and width for cubic yards and bag counts.

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Wire Mesh Calculator

Calculate welded wire mesh (WWM) sheets or rolls needed for concrete reinforcement. Enter slab area for sheet counts and overlap.

Lintel Calculator

Calculate lintel size and concrete volume for door and window openings. Enter span, load type, and wall thickness for lintel dimensions.

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Concrete Slab Calculator

Calculate concrete volume for flat slabs — patios, garage floors, driveways. Enter dimensions and thickness for cubic yards, bags, and cost.

Roof Decking Calculator

Calculate roof decking (sheathing) sheets needed for your roof area. Accounts for roof pitch, waste, and panel size.

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Vapor Barrier Calculator

Calculate vapor barrier (polyethylene sheeting) needed for crawl spaces, slabs, and walls. Includes overlap and seam tape.

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Excavation Calculator

Calculate excavation volume for foundations, pools, and trenches. Get cubic yards and truck loads with swell factor adjustments.

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Crown Molding Calculator

Calculate crown molding needed for any room. Enter room dimensions and molding length for total pieces, cuts, and corner blocks.

Soffit Calculator

Calculate soffit panels, J-channel, and fascia needed for roof overhang enclosures. Enter house perimeter and overhang width.

Rip Rap Calculator

Calculate rip rap (large stone) needed for erosion control, embankments, and shoreline protection. Get tons and cubic yards by area and thickness.

Baseboard Calculator

Calculate baseboard trim needed for any room. Enter room dimensions and number of doors for linear feet and pieces of molding.

Concrete Wall Calculator

Calculate concrete volume for poured walls — foundation walls, retaining walls, and privacy walls. Enter length, height, and thickness.

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French Drain Calculator

Calculate gravel, pipe, and fabric needed for a French drain. Enter trench length, width, and depth for material quantities.

Concrete Pier Calculator

Calculate concrete volume for cylindrical piers and footings. Enter diameter, depth, and quantity for total cubic yards and bags.

House Wrap Calculator

Calculate house wrap (weather barrier) needed for exterior walls. Enter wall dimensions and number of openings for roll quantity.

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Stair Railing Calculator

Calculate stair railing materials — posts, rails, balusters, and hardware. Enter stair length and railing style.

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Drop Ceiling Calculator

Calculate drop ceiling tiles, main runners, cross tees, and wall angle needed for a suspended ceiling. Enter room dimensions.

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Concrete Column Calculator

Calculate concrete volume for rectangular or round columns. Enter dimensions, height, and quantity for total cubic yards.

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Flashing Calculator

Calculate roof and wall flashing needed for chimneys, valleys, and penetrations. Enter run lengths for total linear feet of flashing.

Baluster Calculator

Calculate the number of balusters needed for a deck or porch railing. Enter railing length, baluster width, and spacing.

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Backsplash Calculator

Calculate tile, grout, and adhesive needed for a kitchen or bathroom backsplash. Enter length, height, and tile size.

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Trench Fill Calculator

Calculate backfill material needed for trenches. Enter trench length, width, and depth for cubic yards of gravel, sand, or soil.

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Concrete Driveway Calculator

Calculate concrete volume for a new driveway. Enter length, width, and thickness for cubic yards, bags, and ready-mix cost estimate.

Shingle Calculator

Calculate roofing shingle bundles needed for your roof. Enter roof area, pitch, and waste factor for bundles and squares.

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Caulk Calculator

Calculate caulk tubes needed for sealing joints. Enter total joint length, width, and depth for the number of tubes required.

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Gable Wall Calculator

Calculate the area of a gable wall (triangular end wall) for siding, sheathing, or framing. Enter base width and peak height.

Deck Board Calculator

Calculate deck boards needed for your deck surface. Enter deck dimensions, board width, and gap spacing for total boards and screws.

Mortar Bed Calculator

Calculate mortar for a tile or stone setting bed. Enter area, bed thickness, and mortar type for bags needed.

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Window Trim Calculator

Calculate window trim (casing) needed for all your windows. Enter window sizes, number of windows, and trim width for total linear feet.

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Grout Calculator

Calculate grout needed for tile installations. Enter tile size, joint width, area, and tile thickness for pounds of grout.

Concrete Patio Calculator

Calculate concrete for a patio. Enter length, width, and thickness for volume, bags, and cost. Includes stamped concrete options.

Roof Underlayment Calculator

Calculate roof underlayment (felt or synthetic) needed. Enter roof area, pitch, and overlap for total rolls required.

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Anchor Bolt Calculator

Calculate anchor bolt quantity and spacing for sill plates, mudsills, and holdowns. Enter wall length, spacing, and bolt diameter.

Brick Veneer Calculator

Calculate bricks, mortar, wall ties, and flashing for brick veneer installations. Enter wall area and subtract openings.

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Concrete Washout Calculator

Estimate washout pit size and water volume needed for cleaning concrete trucks, pumps, and tools on site.

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Ridge Vent Calculator

Calculate ridge vent material for roof ventilation. Enter ridge length for linear feet of vent and matching cap shingles.

Stair Stringer Calculator

Calculate stair stringer length, number of risers, tread depth, and lumber needed. Enter total rise and desired riser height.

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Waterproofing Membrane Calculator

Calculate waterproofing membrane for basement walls, decks, and wet areas. Enter area for rolls, adhesive, and seam tape.

Weep Screed Calculator

Calculate weep screed for stucco and masonry wall bases. Enter wall perimeter for linear feet and piece count.

Board Foot Calculator

Convert lumber dimensions to board feet for pricing and ordering. Enter thickness, width, length, and quantity.

Concrete Beam Calculator

Calculate concrete volume and rebar for grade beams and structural beams. Enter beam length, width, and depth.

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Downspout Calculator

Calculate downspout count, length, and extensions for roof drainage. Enter roof area and gutter run for optimal placement.

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Cabinet Door Calculator

Calculate cabinet door sizes, hinge count, and overlay for kitchen and bathroom cabinets. Enter cabinet opening dimensions.

Framing Calculator

Calculate wall framing lumber — studs, plates, headers, and cripples. Enter wall length, height, and opening sizes.

Lumber Weight Calculator

Calculate the weight of lumber by species, dimensions, and moisture content. Covers common softwood and hardwood species.

Rafter Length Calculator

Calculate rafter length, birdsmouth cut, and tail length from roof span, pitch, and overhang. Includes HAP and seat cut.

Dimensional Lumber Calculator

Look up actual vs nominal lumber sizes. See real dimensions for 2×4, 2×6, 2×8, 2×10, 2×12, 4×4, and more.

Plywood Thickness Calculator

Look up actual plywood thickness vs nominal. Compare weights and strengths across plywood types and thicknesses.

Carpentry Cost Calculator

Estimate carpentry labor and material costs. Enter project type, area, and complexity for a total cost range.

Stud Calculator

Calculate wall studs needed for any wall. Enter wall length and stud spacing for total stud count including extras.

Joist Span Calculator

Find maximum allowable joist spans by lumber size, species, grade, and spacing. Covers floor and ceiling joists.

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Shelf Bracket Calculator

Calculate shelf brackets needed based on shelf length, load weight, and bracket spacing for safe support.

Concrete Block Fill Calculator

Calculate grout or concrete fill for hollow CMU blocks. Enter block count and size for cubic yards of fill needed.

Concrete Mix Calculator

Calculate bags of premix concrete needed. Enter dimensions for 40, 50, 60, and 80 lb bag counts with waste factor.

Concrete Weight Calculator

Calculate the weight of a concrete slab or structure. Enter volume or dimensions for weight in standard and lightweight concrete.

Rebar Weight Calculator

Look up rebar sizes, diameters, and weight per foot. Calculate total weight for ordering and structural planning.

Concrete Cost Calculator

Estimate total concrete project costs including material, delivery, labor, and finishing. Enter area and thickness.

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Soil Volume Calculator

Calculate soil volume for raised beds, planters, and landscaping. Enter dimensions for cubic yards and bags needed.

Roofing Cost Calculator

Estimate roofing costs by material type — asphalt shingles, metal, tile, or flat roof. Enter roof area and pitch.

Foundation Calculator

Calculate concrete for foundations — slab, crawl space, or basement. Enter perimeter, width, and depth for footing volume.

Beam Span Calculator

Find maximum beam span for LVL, glulam, steel, and dimensional lumber beams. Enter tributary load width and beam type.

Header Size Calculator

Determine the right header size for door and window openings. Enter span width and load condition for recommended lumber.

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Deck Stain Calculator

Calculate gallons of deck stain or sealer needed. Enter deck area, number of coats, and stain type for coverage estimate.

Paver Base Calculator

Calculate gravel base and sand bedding material for paver installations. Enter area and depth for tons and cubic yards.

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Polymeric Sand Calculator

Calculate polymeric sand for paver joints. Enter paver area, joint width, and paver thickness for bags needed.

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Asphalt Sealer Calculator

Calculate driveway sealcoat needed. Enter area and condition for gallons or buckets of asphalt sealer.

Gravel Driveway Calculator

Calculate gravel for a driveway. Enter length, width, and depth for tons needed with base and top layer breakdown.

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Fence Stain Calculator

Calculate gallons of fence stain or sealer. Enter fence length, height, and sides to stain for total coverage.

Vinyl Fence Calculator

Calculate vinyl fence panels, posts, and gates needed. Enter perimeter and fence style for a complete material list.

Fence Cost Calculator

Estimate total fence cost by material type. Enter length and height for material, labor, and total cost estimate.

Linear Feet to Square Feet Calculator

Convert linear feet to square feet and vice versa. Enter material width for instant conversion between measurement types.

Flooring Cost Calculator

Estimate flooring costs by material — hardwood, laminate, tile, vinyl, or carpet. Includes material, labor, and underlayment.

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Bathroom Renovation Cost Calculator

Estimate bathroom remodel costs by scope and size. Includes fixtures, tile, plumbing, electrical, and labor.

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Electrical Cost Calculator

Estimate electrical project costs — rewiring, panel upgrades, or new circuits. Enter square footage and project type.

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HVAC Cost Calculator

Estimate HVAC installation or replacement costs. Select system type and home size for a total cost range.

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Kitchen Renovation Cost Calculator

Estimate kitchen remodel costs by scope and size. Includes cabinets, countertops, appliances, flooring, and labor.

Acreage Calculator

Calculate land area in acres, square feet, hectares, and square meters. Enter length and width or total square footage.

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Elevation Grade Calculator

Calculate slope grade percentage, ratio, and angle from rise and run. Essential for drainage, roads, and ramps.

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Grass Seed Calculator

Calculate grass seed needed for new lawns or overseeding. Enter area and seed type for pounds and bags required.

Lawn Mowing Calculator

Calculate lawn mowing time, fuel cost, and seasonal expense. Enter lawn area and mower type for estimates.

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Plant and Flower Calculator

Calculate how many plants or flowers you need for a garden bed. Enter bed area and plant spacing for total count.

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Sod Calculator

Calculate sod rolls or pallets needed for a new lawn. Enter area and waste percentage for total coverage and cost.

Sod Weight Calculator

Calculate the weight of sod rolls and pallets. Enter quantity and moisture condition for total weight and transport needs.

Stone Calculator

Calculate stone or rock needed for landscaping, walls, and pathways. Enter area and depth for tons and cubic yards.

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Cubic Feet Calculator

Calculate volume in cubic feet from length, width, and height. Supports feet, inches, and metric inputs.

Cubic Inches Calculator

Calculate volume in cubic inches from dimensions. Convert between cubic inches, cubic feet, liters, and gallons.

Cubic Meters Calculator

Calculate volume in cubic meters. Convert between cubic meters, cubic feet, cubic yards, and liters.

Cubic Yards to Tons Calculator

Convert cubic yards to tons for gravel, sand, soil, mulch, and other bulk materials by density.

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Cylinder Cubic Footage Calculator

Calculate the volume of a cylinder in cubic feet. Enter diameter and height for volume in cu ft, gallons, and liters.

Cylinder Cubic Yardage Calculator

Calculate cylinder volume in cubic yards for concrete piers, columns, and round footings.

Feet and Inches Length Calculator

Add, subtract, multiply, and divide feet, inches, and fractions. Results in ft-in, decimal, yards, meters, cm, and mm.

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Inch Fraction Calculator

Convert decimal inches to fractions or fractions to decimal. Choose 1/8 to 1/64 precision. See mm, cm, and feet + inches equivalents.

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Scale Conversion Calculator

Convert scale to actual, actual to scale, or find scale factor. 12+ presets for architectural, engineering, and model scales plus custom ratio.

Square Feet to Cubic Feet Calculator

Convert square feet to cubic feet by adding depth or thickness. Essential for material volume calculations.

Square Feet to Cubic Yards Calculator

Convert square feet to cubic yards with depth. Select from 7 materials for weight and cost estimates. Adjustable waste factor.

Square Inches Calculator

Calculate square inches for rectangles, circles, and triangles. Enter in inches, cm, mm, or feet. Convert to sq ft, cm², mm², and m².

Square Meters Calculator

Calculate square meters for rectangles, circles, and triangles. Enter in meters, cm, feet, or inches. Add cost per m² for estimates.

Square Yards Calculator

Calculate square yards for rectangles, circles, and triangles. Add cost per sq yd and waste factor. Convert sq ft, sq m, and acres.

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Tank Volume Calculator

Calculate tank volume for 6 shapes with fill level and liquid weight. Supports cylinder, capsule, sphere, rectangle, and oval tanks.

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CFM Calculator

Calculate CFM airflow by room type. Auto-set ACH, ASHRAE occupant minimum, L/s metric, and duct size recommendation.

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Flow Rate Calculator

Calculate flow rate two ways: pipe velocity × area or volume ÷ time. Standard US pipe sizes, GPM, GPH, liters/min, CFS, and daily estimate.

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Furnace BTU Calculator

Calculate furnace BTU for your home. Adjust for climate zone, insulation, ceiling height, AFUE efficiency, fuel type, and see estimated annual heating cost.

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Pipe Volume Calculator

Calculate pipe volume by size and material. Get gallons, liters, cubic feet, water weight, and gallons per foot. Supports multiple pipes.

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Refrigerant Line Charge Calculator

Calculate additional refrigerant charge for HVAC line sets. Select R-410A, R-22, or R-407C with system tonnage, liquid + suction line sizes.

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Water Velocity Calculator

Calculate water velocity in pipes. Select standard pipe sizes, material, and temperature. Get Reynolds number, flow type, and velocity assessment.

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Window Air Conditioner Size Calculator

Calculate the right BTU window AC unit. Adjust for ceiling height, sun, insulation, kitchen, occupants. See electrical requirements and monthly cost.

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Ice & Water Shield Calculator

Calculate ice and water shield membrane for eaves, valleys, and penetrations. Choose roll size, roof pitch, and get rolls and cost.

Metal Roofing Calculator

Calculate metal roofing panels, screws, ridge cap, and cost. Choose from 5 panel types with roof pitch, gauge, and pricing.

Plywood Sheathing Calculator

Calculate plywood or OSB sheathing sheets for roofs, walls, or subfloors. Choose sheathing type, roof pitch, and get weight and cost estimates.

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Roof Snow Load Calculator

Calculate snow weight on your roof. Choose snow type, roof pitch, and compare against design load capacity with structural safety check.

Roofing Material Calculator

Calculate all roofing materials needed: shingles, underlayment, nails, ridge cap, drip edge, and flashing for a complete job.

Clapboard and Lap Board Siding Calculator

Calculate clapboard or lap siding boards, courses, linear feet, and cost. Choose from 5 board materials with exposure, overlap, and gable support.

Siding Material Calculator

Calculate siding squares for any home exterior. Choose from 6 siding types, account for gables, windows, and doors, and get weight and cost estimates.

Vinyl Siding Calculator

Calculate vinyl siding panels, J-channel, corners, and starter strips. Enter wall dimensions and openings for a complete material list.

Plastering Calculator

Calculate cement and sand needed for plastering walls and ceilings. Enter wall area, plaster thickness, and mix ratio to get material quantities in bags and cubic feet with cost estimate.

PCC Calculator

Calculate cement, sand, and aggregate for Plain Cement Concrete (PCC) work. Choose from standard mix ratios (1:2:4, 1:3:6, 1:4:8, 1:1.5:3) and get material quantities with dry volume factor.

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RCC Calculator

Calculate cement, sand, aggregate, and steel reinforcement for Reinforced Cement Concrete (RCC) work. Includes steel percentage input for beams, columns, slabs, and footings with material and cost breakdown.

Construction Cost Estimator

Estimate total house construction cost based on built-up area, number of floors, construction quality, and city tier. Get a detailed breakdown of material, labor, and finishing costs.

Carpet Area Calculator

Convert between carpet area, built-up area, and super built-up area for real estate. Enter any one area to calculate the other two using standard loading percentages. RERA compliant.

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Steel Quantity Calculator

Estimate total steel reinforcement needed for house construction based on built-up area, structure type, and number of floors. Get weight in kg/tons and number of bars by diameter.

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Anti-Termite Calculator

Calculate chemical solution quantity for pre-construction anti-termite treatment. Enter plinth area, treatment depth, and chemical concentration to get total solution needed per IS 6313 standard.

Compound Wall Calculator

Calculate precast panels, pillars, and foundation concrete for compound/boundary wall construction. Enter total wall length, height, and pillar spacing to get complete material quantities and cost.

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Countertop Calculator

Calculate countertop material for kitchen platforms and vanities. Enter counter dimensions and material type (granite, quartz, marble, laminate) to get area, slabs needed, and cost estimate.

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Solar Rooftop Calculator

Estimate solar panel system size for your rooftop. Enter roof area, monthly electricity bill, and location to get system capacity (kW), panel count, annual generation, and payback period.

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Solar Water Heater Calculator

Estimate the right solar water heater size for your household. Enter family size, daily hot water usage, and climate zone to get tank capacity, collector area, and annual energy savings.