Calculaxy Automotive
Automotive Calculators
Simple tools for checking engine speed, vehicle speed, electrical power, and other numbers used in everyday automotive work.
Choose a calculator
Each tool is built around a specific calculation, with simple inputs, clear results, examples, and useful notes so you can understand the number you get.
RPM Speed Calculator
Estimate vehicle speed from engine RPM and wheel or tire diameter, or work backward from speed to RPM.
Open calculatorAvailableAmps to Watts Conversion Calculator
Convert amps to watts and watts to amps using voltage and, when needed, power factor.
Open calculatorAvailableCompression Ratio Calculator
Calculate engine compression ratio from bore, stroke, chamber volume, piston dish or dome, gasket volume, and deck clearance.
Open calculatorAvailableGear Ratio RPM Calculator
Work out wheel RPM and road speed from engine RPM, gear ratio, final drive ratio, and tire diameter.
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Explore another category when your calculation needs a different tool.