Tire Revolutions per Kilometer Calculator
Calculate tire revolutions per kilometer for any size. Get wheel turns per km and per hour at 100 km/h in metric units.
Estimate rotations over one kilometer.
Tire Revolutions per Kilometer Calculator: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How Tire Revolutions per Kilometer Calculator Works?
The Tire Revolutions per Kilometer Calculator works by dividing 1,000,000 mm (1 km) by the tire's circumference in millimeters. The calculation has 3 steps.
Enter the size
Type a metric size, for example 205/55 R16.
Find the circumference
The calculator returns a circumference of 1,985 mm (1.985 m).
Divide one kilometer
The calculator divides 1,000,000 mm by 1,985 mm and returns 504 revolutions per kilometer.
Tire Revolutions per Kilometer Calculator Formula
The Tire Revolutions per Kilometer Calculator formula is R_km = 1,000,000 ÷ (π × OD_mm).
R_km = 1,000,000 ÷ (π × OD_mm)R_km = RPM ÷ 1.609344C_m = 1,000 ÷ R_km- R_km
- Revolutions per kilometer
- OD_mm
- Overall diameter (mm)
- 1.609344
- Kilometers per mile
Worked example
A 275/55 R20 tire measures 810.5 mm, so the circumference is 2,546 mm. The tire turns 1,000,000 ÷ 2,546 = 393 times per kilometer, or 39,300 times per hour at 100 km/h (62 mph).
Tire Revolutions per Kilometer Calculator Conversion Table
The Tire Revolutions per Kilometer Calculator conversion table lists the nominal revolutions per kilometer of 10 common sizes and the wheel turns per hour at 100 km/h.
| Size | Circumference (cm) | Circumference (m) | Revs per km | Revs per hour |
|---|---|---|---|---|
| 195/65 R15 | 199.3 cm | 1.99 m | 502 | 50,167 rev/h at 100 km/h |
| 205/55 R16 | 198.5 cm | 1.99 m | 504 | 50,373 rev/h at 100 km/h |
| 215/60 R16 | 208.7 cm | 2.09 m | 479 | 47,909 rev/h at 100 km/h |
| 225/45 R17 | 199.3 cm | 1.99 m | 502 | 50,183 rev/h at 100 km/h |
| 225/65 R17 | 227.5 cm | 2.28 m | 439 | 43,947 rev/h at 100 km/h |
| 235/45 R18 | 210.1 cm | 2.10 m | 476 | 47,601 rev/h at 100 km/h |
| 245/40 R18 | 205.2 cm | 2.05 m | 487 | 48,731 rev/h at 100 km/h |
| 255/35 R19 | 207.7 cm | 2.08 m | 481 | 48,149 rev/h at 100 km/h |
| 265/70 R17 | 252.2 cm | 2.52 m | 396 | 39,650 rev/h at 100 km/h |
| 275/55 R20 | 254.6 cm | 2.55 m | 393 | 39,273 rev/h at 100 km/h |
What is Tire Revolutions per Kilometer Calculator?
A Tire Revolutions per Kilometer Calculator is a tool that estimates how many times a tire turns over one kilometer of road. European, Asian and Australian tire data books list rolling figures per kilometer or as a rolling circumference in millimeters.
Revolutions per kilometer equals revolutions per mile divided by 1.609. A tire with 808 revs per mile turns 502 times per kilometer.
Tachograph calibration in commercial vehicles uses the same value, expressed as the w-factor in impulses per kilometer.
What are the uses of Tire Revolutions per Kilometer Calculator?
There are 4 main uses of the Tire Revolutions per Kilometer Calculator, including tachograph setup and metric speedometer calibration.
Tachograph setup
Supply the rolling circumference for tachograph and trip recorder calibration.
Metric speedometer calibration
Program aftermarket gauges sold in metric markets.
Bicycle and e-bike computers
Enter a wheel's rolling distance for accurate speed readings.
Metric data comparison
Compare calculated figures with European tire data sheets.
Related Core Tire Dimensions Tools
View All 134 Subtools →Compare two tire sizes.
Compare several sizes together.
Estimate nominal overall diameter.
Calculate absolute and percentage differences.
Estimate nominal circumference.
Compare estimated rolling distances.