Automotive Calculators โ Engine, Fuel, Tires, EV & Loan Tools
55+ free automotive calculators covering engine performance, fuel economy, wheels & tires, electric vehicles, and vehicle financing. From estimating horsepower and quarter-mile times to comparing tire sizes and calculating loan payments โ instant, accurate results for every automotive need.
Calculator Categories
Engine & Performance (10)
Horsepower, torque, displacement, compression ratio, carburetor CFM, quarter mile, gear ratio & more.
Fuel Economy (9)
Gas mileage (MPG), fuel cost, fuel savings, cost per mile, MPG โ L/100km converter & more.
Wheels & Tires (8)
Tire size calculator, tire comparison, speedometer error, wheel offset, bolt pattern & more.
EV Calculators (22)
EV vs gas comparison, charging cost & time, range estimator, tax credit eligibility, battery degradation & more.
Vehicle Loan Calculators (7)
Auto loan, car lease, lease vs buy, motorcycle, boat, RV, and ATV loan payment calculators.
๐ง Engine & Performance Calculators
Engine Horsepower Calculator
Calculate engine horsepower using RPM & torque, quarter-mile elapsed time, or trap speed methods. Supports HP, kW, and PS conversions.
โ โ โ โ โEngine Torque Calculator
Calculate engine torque from horsepower and RPM. Convert between lb-ft, Nm, and kg-m. See the torque curve relationship.
โ โ โ โ โEngine Displacement Calculator
Calculate engine displacement (CID/cc/L) from bore, stroke, and number of cylinders. Compare common engine configurations.
โ โ โ โ โEngine Compression Ratio Calculator
Calculate engine compression ratio from swept volume and clearance volume. Understand the impact on power and fuel octane requirements.
โ โ โ โ โCarburetor CFM Calculator
Calculate the correct carburetor size in CFM for your engine using displacement, RPM, and volumetric efficiency.
โ โ โ โ โ0โ60 & Quarter Mile Calculator
Estimate quarter-mile elapsed time and trap speed from vehicle weight and horsepower. Calculate 0-60 mph time.
โ โ โ โ โHorsepower-to-Weight Ratio Calculator
Calculate power-to-weight ratio in HP/ton, lb/HP, and HP/liter. Compare your vehicle's performance potential against common benchmarks.
โ โ โ โ โGear Ratio Calculator
Calculate overall gear ratio, RPM at speed, and speed at RPM from transmission gear, differential ratio, and tire size.
โ โ โ โ โTop Speed Estimator
Estimate a vehicle's theoretical top speed from horsepower, weight, drag coefficient, and frontal area.
โ โ โ โ โDyno Correction Factor Calculator
Calculate SAE J1349, DIN 70020, and STD dyno correction factors from temperature, barometric pressure, and humidity.
โ โ โ โ โโฝ Fuel Economy Calculators
Gas Mileage Calculator
Calculate your vehicle's gas mileage (MPG) from distance traveled and fuel used. See cost per mile and metric equivalents.
โ โ โ โ โFuel Cost Calculator
Calculate the fuel cost for any trip distance based on your vehicle's MPG and current gas price. Compare regular, mid-grade, and premium.
โ โ โ โ โFuel Savings Calculator
Compare annual fuel costs between two vehicles. See how much you'd save by switching to a more fuel-efficient car.
โ โ โ โ โCost Per Mile Calculator
Calculate the true all-in cost per mile including fuel, insurance, maintenance, depreciation, and financing.
โ โ โ โ โFuel Injector Flow Rate Calculator
Calculate required fuel injector flow rate (lb/hr or cc/min) based on target horsepower, BSFC, number of injectors, and duty cycle.
โ โ โ โ โFuel Tank Range Calculator
Calculate how far you can drive on a full tank or remaining fuel based on your vehicle's MPG and tank size.
โ โ โ โ โAnnual Fuel Cost Calculator
Calculate your total annual fuel expenditure based on yearly miles driven, vehicle MPG, and local fuel price.
โ โ โ โ โMPG Improvement Savings Calculator
Calculate how much money you save by improving your vehicle's fuel economy from one MPG to another over a year.
โ โ โ โ โMPG to L/100km Converter
Convert between MPG (US), MPG (Imperial), km/L, and L/100km. Bidirectional fuel economy unit conversion with instant results.
โ โ โ โ โ๐ Wheels & Tires Calculators
Tire Size Calculator
Decode any tire size (P-metric, LT-metric, flotation) into actual dimensions โ diameter, width, sidewall height, circumference, and revolutions per mile.
โ โ โ โ โTire Size Comparison Calculator
Compare two tire sizes side by side โ diameter difference, width difference, speedometer error, and fitment compatibility.
โ โ โ โ โTire Size Conversion Calculator
Convert tire sizes between P-metric (225/55R17), inches (28ร10.50R15), and metric (750-16) formats.
โ โ โ โ โSpeedometer Error Calculator
Calculate speedometer error caused by changing tire sizes. See your actual speed vs. displayed speed at any indicated speed.
โ โ โ โ โSpeedometer Gear Calculator
Calculate the correct speedometer driven gear tooth count for mechanical speedometers after changing tire size or axle ratio.
โ โ โ โ โWheel Offset Calculator
Calculate wheel offset (ET), backspacing, and track width change when switching to different wheels. Ensure safe fender clearance.
โ โ โ โ โTire Pressure Adjustment Calculator
Calculate the correct tire pressure adjustment for temperature changes, load variations, and altitude. PSI and bar units supported.
โ โ โ โ โBolt Pattern / PCD Calculator
Calculate Pitch Circle Diameter (PCD) from number of bolts and measurement between them. Find compatible wheel bolt patterns.
โ โ โ โ โ๐ก Why Use Our Automotive Calculators?
Whether you're building a high-performance engine, shopping for the right tires, planning a road trip on a budget, or financing your next vehicle โ these automotive calculators give you the precise numbers you need. Every tool provides instant results with both US and metric units displayed inline, so you never have to convert manually.
Our engine calculators use industry-standard formulas (SAE J1349, Roger Huntington's ยผ-mile method) and include preset data for popular engines. Fuel economy tools compare costs across vehicles and project multi-year savings. Tire calculators decode P-metric notation, flag speedometer errors, and verify fitment safety โ all in real time as you type.
Automotive Calculator FAQ
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