Wheel Diameter Speed Calculator
Calculate ideal rolling speed in km/h from wheel diameter in metres and rotational speed in RPM.
A QUICK WALKTHROUGH
How to use this tool
- Enter the wheel diameter in metres.
- Enter rotational speed in revolutions per minute (RPM).
- Calculate ideal rolling speed; real speed may differ because of slip, load, deformation, or measurement error.
Formula and limitations
Ideal speed (km/h) = π × diameter (m) × RPM × 60 ÷ 1000. This geometric estimate assumes no slip and a constant effective rolling diameter. It does not account for tire deformation, load, wear, traction, or measurement error, and is not an operating safety approval.
Privacy
Inputs are processed locally in this browser and are not uploaded.
GOOD TO KNOW
Common questions
What formula is used?
Ideal speed in km/h = π × diameter in metres × RPM × 60 ÷ 1000.
Does this give actual road speed?
It gives ideal no-slip rolling speed. Tire deformation, load, wear, and slip can change actual speed.
Can I use the result as a safety or operating limit?
No. It is a calculation aid, not an engineering or vehicle operating approval.