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Gas Mileage / Fuel Economy CalculatorCalculate gas mileage and fuel economy in MPG (US), MPG (Imperial), km/L and L/100km from distance and fuel used, plus trip fuel cost.
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How Much Car Can I Afford? (Car Affordability Calculator)Find the max car price you can afford from a target monthly payment, loan term, APR, sales tax, down payment and trade-in. US sales-tax model.
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Car Loan Payment CalculatorEstimate your monthly car loan payment from price, sales tax, down payment, trade-in, term and interest rate. See total interest and financed amount.
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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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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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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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Speedometer Correction CalculatorFind your true speed after changing tire size. Enter indicated speed plus old and new tire diameters to see corrected speed and speedometer error.
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Monthly Fuel Cost CalculatorEstimate your monthly fuel cost from miles driven, MPG, and fuel price. See gallons used and yearly spend instantly with this gas cost calculator.
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Engine RPM from MPH CalculatorCalculate engine RPM at any speed from your gear ratio, final drive ratio, and tire diameter. Free RPM-from-MPH calculator with worked example.
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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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Fuel Injector CalculatorCalculate the optimal fuel injector size for your engine with our free online calculator. Input engine displacement, cylinder count, max horsepower, and fuel pressure for accurate results. Perfect for car enthusiasts and mechanics.
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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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BSFC (Brake Specific Fuel Consumption) CalculatorCalculate Brake Specific Fuel Consumption (BSFC) from fuel consumption rate and power output. Get results in kg/(kW·h) and g/(kW·h) instantly.
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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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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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Carburetor CFM CalculatorCalculate the carburetor CFM your engine needs from displacement (CID), max RPM, and volumetric efficiency. Free, fast carburetor sizing tool.
