EngineCalc

EngineCalc is the essential toolkit for engine builders, mechanics, and motorsport enthusiasts. Whether you're building a street rod, a race engine, or modifying a performance vehicle, EngineCalc puts the math at your fingertips — with the formula shown for every calculation so you always understand exactly what's happening under the hood.

CALCULATORS

Piston
• Piston Speed — mean piston velocity from RPM and stroke
• Compression Ratio — from cylinder and chamber volumes
• Rod Ratio — connecting rod length to stroke relationship
• Rod Length — from block length, stroke, and deck clearance
• Piston Dome Volume — dome cc needed to hit a target compression ratio
• Compression Height — wristpin height from deck clearance and stroke
• Cylinder Displacement — total displacement from bore, stroke, and cylinder count

Power
• Simple Horsepower — quick HP from RPM and torque
• Torque — from horsepower and RPM
• Horsepower — using MEP, displacement, compression ratio, and VE
• Corrected BHP — sea-level horsepower adjusted for altitude
• BHP Loss — how much power elevation costs you
• Volumetric Efficiency — actual vs. theoretical airflow
• Theoretical Volume Flow — maximum CFM at a given RPM
• Actual Volume Flow — real-world CFM with volumetric efficiency

Fuel
• Air Density — available oxygen from altitude and temperature
• Mass Flow — air mass moving through the engine per minute
• BSFC — brake specific fuel consumption and engine efficiency

UNIT CONVERSIONS

Thirteen categories covering every unit an engine builder needs:

Torque • Pressure • Power • Volume • Temperature • Length • Mass
Speed • Force • Fuel Efficiency • Frequency • Energy • Angle

Type a value in any unit and all others update instantly. Categories you use most rise to the top automatically.

FEATURES
• Search — jump straight to any calculator by name
• Metric and Standard measurement systems — switch anytime, values convert automatically
• Formulas displayed for every calculator — no black boxes
• Results shown with units, and shareable to any app or message
• Result history — your last stored values for each calculator
• Built-in guide — contextual help for calculators and conversions, available anytime
• Works completely offline — no account, no subscription, no data collected