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Car Loan CalculatorCalculate your car (auto) loan monthly payment, total amount paid, and total interest from the loan amount, term, and annual interest rate.
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MPGe CalculatorCalculate MPGe (miles per gallon equivalent) for electric vehicles from miles driven and kWh used, using the 33.7 kWh/gallon standard.
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Miles Per kWh CalculatorCalculate your electric vehicle's efficiency in miles per kWh. Enter miles driven and kWh used to get mi/kWh, kWh/100mi, and Wh/mile instantly.
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Horsepower to Amps CalculatorConvert horsepower (HP) to amps for DC, single-phase, and three-phase motors. Enter voltage, efficiency, and power factor to get current draw in amps.
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Fuel Economy CalculatorCalculate your vehicle's fuel economy in MPG from distance driven and fuel used. Also converts to L/100km and km/L instantly.
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Tire Manufacture Date CalculatorDecode the 4-digit DOT tire code to find the exact week and calendar date your tire was manufactured. Works for tires made in 2000 or later.
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Bike Chain Length CalculatorCalculate the correct bicycle chain length from chainstay length, largest chainring and largest cog using the rigid chain length equation. Results in inches and links.
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Bike Speed CalculatorCalculate your bike speed from cadence, gear ratio (chainring/cog) and wheel size. Get results in km/h, mph and m/s instantly.
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Bike Cadence CalculatorCalculate your cycling cadence (pedal RPM) from speed, wheel circumference, and gear ratio. Free, instant bike cadence calculator for any gearing.
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E-Bike Range CalculatorEstimate how far your electric bike can travel on a full charge using battery voltage, capacity (Ah), and energy consumption per kilometer.
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Bike Cadence and Speed CalculatorCalculate cycling speed from cadence, gear ratio and wheel size. Find your speed in km/h and mph from chainring, cog and wheel circumference.
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Reaction Time Distance CalculatorCalculate the distance your vehicle travels during your reaction time. Enter speed (km/h, mph, m/s) and reaction time to get reaction distance.
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Gear Ratio Speed CalculatorCalculate vehicle speed from engine RPM, tire diameter, transmission gear ratio, and final drive ratio. Get results in km/h, mph, and m/s instantly.
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Gear Ratio RPM CalculatorCalculate output RPM from input speed and gear ratio. Enter motor/engine RPM and the gear ratio to find the resulting shaft speed instantly.
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Fuel Economy Unit Converter (km/L ⇔ mpg ⇔ L/100km)Convert fuel economy between km/L, L/100km, L/km, US mpg and Imperial mpg, plus gal/100mi. Enter one value and get all eight units at once.
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Propeller Slip CalculatorCalculate boat propeller slip percentage from engine RPM, prop pitch, gear ratio and actual speed. Free online prop slip calculator with theoretical speed.
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Mean Piston Speed CalculatorCalculate mean piston speed (MPS) from stroke and RPM. Enter stroke in mm and engine speed to get piston speed in m/s and ft/min instantly.
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Piston Force CalculatorCalculate piston force from pressure and bore diameter using F = P × (π/4) × D². Supports SI (Pa, m → N) and Imperial (psi, in → lbf) units.
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Gear Ratio CalculatorCalculate gear ratio from driver and driven gear teeth, then find output speed (RPM) and output torque for any gear pair. Fast and free.
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Carburetor CFM CalculatorCalculate the carburetor CFM your engine needs from displacement (CID), max RPM, and volumetric efficiency. Free, fast carburetor sizing tool.
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Engine Displacement CalculatorCalculate total engine displacement from bore, stroke, and cylinder count. Get results in cc, liters, and cubic inches instantly with this free tool.
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Crawl Ratio CalculatorCalculate your 4x4 crawl ratio from transmission, transfer case, and axle gear ratios. Find total low-range reduction for off-road rock crawling.
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Quarter Mile CalculatorEstimate your car's quarter mile elapsed time (ET) and trap speed from vehicle weight and engine horsepower using Hale's classic formulas.
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Car Crash CalculatorEstimate the average impact force of a car crash from mass, speed and stopping distance. Also gives kinetic energy, deceleration and g-force.
