Torquely is a small set of shop calculators: tire fitment, axle gears, horsepower from torque, compression, injectors, wheel offset, and unit converters for metric and imperial specs. Math runs in your browser. Each tool page publishes the formula it uses and when the number is the wrong tool for the job.
These are planning numbers, not a workshop manual. Confirm OEM torque, inflation, and clearances before you cut, order, or drive. Each calculator page publishes the formula so you can check the math — more about who publishes this .
Tire, speedo, and unit conversion tools.
Tire Size Calculator
Check fitment and speedometer impact of a tire size change.
Unit Converter
Cross-reference specs between metric and imperial.
Power Converter
Convert hp, kW, PS, and bhp.
Pressure Converter
Convert psi, bar, and kPa.
Displacement Converter
Convert liters to cubic inches for engine badges.
Torque Unit Converter
Convert lb·ft to N·m for wrenches and dyno sheets.
Length Converter
Convert mm to inches for offset, bore, and stroke.
Weight Converter
Convert pounds to kilograms for curb weight and parts.
Volume Converter
Convert liters, US gallons, and quarts.
Speed Converter
Convert mph to km/h for trap speed and cruise.
Temperature Converter
Convert °F to °C for coolant and oil temps.
Speedometer Calibration
Correct speedo reading after tire or gear changes.
Tire Pressure Calculator
Adjust recommended PSI for load, size, or towing.
Engine, gearing, and power calculators.
Horsepower Calculator
Calculate horsepower from torque and RPM.
Torque Calculator
Calculate torque from horsepower and RPM.
Gear Ratio Calculator
Dial in diff and axle gearing decisions.
RPM at Speed Calculator
Engine RPM at a given speed from tire size and gearing.
Compression Ratio Calculator
For piston, head swaps, and engine builds.
Engine Displacement Calculator
Total displacement from bore and stroke.
Quarter Mile Calculator
Estimate 1/4-mile ET and trap speed from weight and horsepower.
Cam, fuel, suspension, and wheel fitment tools.