Mean Piston Speed Calculator
Calculate mean piston travel speed and a simple-harmonic peak-speed approximation from stroke and rpm.
YOUR CALCULATION
Result
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Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
Count two strokes of piston travel per crank revolution and separately label the infinite-rod sinusoidal approximation.
Mean speed=2×stroke×rpm/60; sinusoidal peak=π×stroke×rpm/60
Worked example
An 86 mm stroke at 6000 rpm gives mean piston speed 17.2 m/s and sinusoidal peak about 27.0176968 m/s.
Assumptions and input details
Mean travel speed is exact for the entered stroke/rpm. The peak approximation ignores finite connecting-rod geometry, piston acceleration, loads and any permissible engine-speed limit.
Unit definitions
Unit selection is independent of language. Each selector contains only units for its physical quantity. Calculations use defined base units internally.
Choose from 23 length definitions, including explicitly labelled regional measures. Area conversions square the length factor; geometric volumes cube it.
Regional measures are not interchangeable merely because their names look similar. This is a documented selection, not a claim to include every historical unit.
NIST measurement tables · Japanese traditional units · Mainland China and Hong Kong unit distinctions
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
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