About the Piston Speed Calculator
Mean piston speed at a given RPM — the key indicator of engine stress and longevity.
Also known as: mean piston speed, piston velocity, engine stress calculator.
How to use this calculator
- Enter stroke, engine speed.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
mean piston speed = 2 × stroke × RPM / 60
Worked example
Using the values pre-filled in the calculator above:
- Stroke = 86 mm
- Engine speed = 6,500 RPM
the calculator returns:
- Mean piston speed: 18.633 m/s
- In feet per minute: 3,668
- Assessment: Sporty but durable
- RPM for 20 m/s: 6,977