Free Automotive Tools
Calculators and converters for builds, tuning, and track work — search or filter by category.
40 tools
Length Conversion
Convert between metric and imperial length units.
Open tool →Mass Conversion
Convert kilograms, pounds, ounces, and more.
Open tool →Temperature Conversion
Convert Celsius, Fahrenheit, and Kelvin.
Open tool →Time Conversion
Convert seconds, minutes, hours, and race intervals.
Open tool →Curb Weight
Convert and compare vehicle curb weight units.
Open tool →Payload
Calculate payload capacity from GVWR and curb weight.
Open tool →Towing Capacity
Estimate safe towing capacity from vehicle ratings.
Open tool →Oil Capacity Conversion
Convert engine oil volume between quarts, liters, and gallons.
Open tool →Coolant / Brake Fluid / ATF
Convert coolant, brake fluid, and ATF volumes.
Open tool →Washer Fluid
Convert windshield washer fluid capacities.
Open tool →Acceleration
Convert acceleration units used in performance testing.
Open tool →Boost Pressure
Convert boost between PSI, bar, and kPa.
Open tool →Engine Calculator
Compute bore, stroke, displacement, and related specs.
Open tool →Engine Displacement
Convert engine displacement between liters and cubic inches.
Open tool →Horsepower
Convert HP, kW, and metric PS instantly.
Open tool →Top Speed
Convert and estimate top-speed figures across units.
Open tool →Torque
Convert torque between Nm, lb-ft, and kg-m.
Open tool →Acceleration Estimation
Estimate 0–60 and related times from power and weight.
Open tool →Gear Ratio Speed
Calculate road speed from gear ratios and tire size.
Open tool →Horsepower & Torque
Convert between horsepower and torque at a given RPM.
Open tool →Fuel Capacity
Convert fuel tank capacity between gallons and liters.
Open tool →Fuel Economy
Convert MPG, L/100km, and km/L economy figures.
Open tool →Fuel Flow Rate
Calculate fuel system flow requirements.
Open tool →Injector Flow Rate
Convert injector flow rates across common units.
Open tool →Cost Comparison
Compare fuel costs across blends and economy figures.
Open tool →Ethanol Blend
Mix two fuels to hit a target ethanol percentage.
Open tool →Ethanol Content Estimator
Estimate ethanol content from specific gravity readings.
Open tool →Fuel Consumption
Estimate trip fuel use from economy and distance.
Open tool →Injector Size
Size injectors for target horsepower and duty cycle.
Open tool →Downforce
Estimate aerodynamic downforce from speed and coefficient.
Open tool →Drag Force
Calculate aerodynamic drag force at speed.
Open tool →Brake Bias
Calculate front/rear brake bias percentages.
Open tool →Corner Weight
Analyze corner weights, cross weight, and balance.
Open tool →Ride Height Rake
Compute rake from front and rear ride heights.
Open tool →Wheel Alignment
Check camber, toe, and caster against setup targets.
Open tool →Lateral Acceleration
Convert and estimate lateral g from cornering data.
Open tool →Roll Center
Estimate roll-center height from suspension geometry.
Open tool →Weight Transfer
Calculate longitudinal and lateral weight transfer.
Open tool →Lap Time
Convert and analyze lap times and sector splits.
Open tool →Tire Degradation
Model tire wear impact on lap time over a stint.
Open tool →Important Disclaimer & Hold Harmless Agreement
Accuracy & Discrepancies
All calculations, estimations, and conversions provided on this free tools page are for simulation, reference, and educational purposes only. Real-world parameters such as friction, temperature, humidity, and component tolerances can cause substantial discrepancies between these estimates and actual results.
Verification Required
Users must always double-check and independently verify all calculation results (especially critical specs like wheel alignment angles, fuel flow rates, and torque capacities) using official factory service manuals or professional equipment before performing physical vehicle modifications.
Hold Harmless Policy
By using these tools, you explicitly agree to hold BuildLockr, its founders, and affiliates entirely harmless from any mechanical damage, part failures, physical injury, or financial loss resulting from the use or reliance of these calculations. You build and modify at your own risk.