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 weight and bag count with 10% overage.

🌿 Mulch Calculator

Shape

Mulch Type

Length (ft)

Width (ft)

Depth (inches)

Bag Size

Price per Bag ($)

Bulk Price per cu yd ($)

VOLUME (incl. 10% overage)

Coverage Area100.00 sq ft

Cubic Feet27.50 cu ft

Cubic Yards1.02 cu yd

Weight (approx)612 lbs

BAGS

Bags (2 cu ft)14 bags

COST COMPARISON

Bagged Cost$63

Bulk Cost$31

You Save (bulk)$33

💡 How to Calculate Mulch Needs

Mulch is essential for healthy landscaping throughout the United States. It retains soil moisture, suppresses weeds, regulates soil temperature, and creates a polished, finished look for garden beds, tree rings, and walkways. Knowing exactly how much mulch to buy prevents waste and ensures even coverage.

The calculator above supports 8 common mulch types, automatically includes 10% overage for settlement and spillage, calculates bags needed (2 or 3 cu ft), and compares bagged vs. bulk pricing so you can see exactly how much you'll save buying in bulk.

Convert volume with our cubic yards calculator. Measure bed area with our square footage calculator. For gravel, try our gravel calculator.

Mulch Types and Recommended Depth

Mulch Type	Recommended Depth	Weight per Cu Yd	Bag Cost (2 cu ft)	Bulk Cost per Cu Yd
Shredded Hardwood Bark	3–4 inches	~600 lbs	$4–$5	$25–$35
Cedar Mulch	2–3 inches	~550 lbs	$5–$7	$35–$45
Pine Bark Nuggets	3–4 inches	~450 lbs	$4–$6	$30–$40
Pine Straw	3–4 inches	~300 lbs	$5–$8/bale	$25–$35
Wood Chips	3–4 inches	~500 lbs	$3–$5	$20–$30
Dyed Mulch (black/red/brown)	2–3 inches	~600 lbs	$4–$6	$30–$40
Rubber Mulch	1–2 inches	~1,200 lbs	$7–$10	$150–$180
Decorative Stone Mulch	2 inches	~2,800 lbs	$5–$8	$45–$70

Step-by-Step Mulch Calculation

Step 1: Measure the Area

Measure the length and width of each bed in feet. For circular tree rings, measure the diameter. For irregular beds, break them into rectangles and circles, then add the results.

Step 2: Choose Depth

Select depth based on mulch type and purpose:

Fine mulch (decomposed, cocoa hull): 1–2 inches
Medium mulch (shredded bark, cedar): 2–3 inches
Coarse mulch (pine bark nuggets, wood chips): 3–4 inches
Rubber mulch (playgrounds): 3–6 inches for fall protection
Weed suppression only: 4+ inches with landscape fabric underneath

Step 3: Calculate Volume

Rectangle: Length (ft) × Width (ft) × Depth (in) ÷ 12 = Cubic Feet. Divide by 27 for Cubic Yards.

Circle: π × (Diameter ÷ 2)² × Depth (in) ÷ 12 = Cubic Feet. Divide by 27 for Cubic Yards.

Step 4: Add 10% Overage

Mulch is lightweight and tends to migrate and settle. Add 10% extra to account for spillage, settlement, and transport loss. If buying bags, always round up.

Mulch Coverage Chart

How much area does 1 cubic yard of mulch cover at different depths?

Depth	Coverage (sq ft)	Bags (2 cu ft)	Bags (3 cu ft)	Best For
1 inch	324 sq ft	14	9	Light top-up, fine mulch
2 inches	162 sq ft	14	9	Cedar, dyed, stone
3 inches	108 sq ft	14	9	Standard organic mulch
4 inches	81 sq ft	14	9	Heavy weed suppression
6 inches	54 sq ft	14	9	Playground rubber mulch

Note: Bag counts are per cubic yard regardless of depth. Coverage area changes with depth, but 1 cu yd always equals 27 cu ft = 14 bags (2 cu ft) or 9 bags (3 cu ft).

Bagged vs. Bulk: Which Is Cheaper?

Method	Cost per Cu Yd	Pros	Cons
Bagged (2 cu ft)	$54–$94 equivalent	Easy to transport, fits in car, no minimum order	More expensive per cu yd, more plastic waste
Bulk delivery	$20–$45 + delivery	40–60% cheaper, less waste	Needs driveway space, delivery fee ($50–$100)

Break-even point: For most mulch types, buying bulk becomes cheaper at about 3+ cubic yards (40+ bags). Below that, bags may be more practical despite the higher per-unit cost.

2025 US Mulch Price Guide

Mulch Type	Bagged (2 cu ft)	Bulk per Cu Yd	Delivery (5–10 mi)
Shredded Hardwood	$4–$5	$25–$35	$50–$100
Cedar	$5–$7	$35–$45	$50–$100
Pine Bark Nuggets	$4–$6	$30–$40	$50–$100
Dyed (black/red/brown)	$4–$6	$30–$40	$50–$100
Rubber	$7–$10	$150–$180	$75–$150
Wood Chips	$3–$5	$20–$30	$50–$100

Pro tip: Many municipalities offer free wood chip mulch from tree trimming programs. Check your city's public works department — you may only need to pay for delivery.

A 10×10 ft garden bed with 3 inches of mulch = 100 × 0.25 = 25 cu ft = 0.93 cu yd. That's about 13 bags (2 cu ft each). At $5/bag = $65 in bags vs. ~$35 for bulk.