Tire Code Calculator

The first number in the code: 225 in 225/60R16.
Sidewall height as a percentage of section width: 60 in 225/60R16.
The wheel diameter in inches: 16 in 225/60R16.
Optional. Enter the whole sidewall designation and it overrides the three fields above, and decodes the load index and speed symbol.
Overall diameter
676.40 mm
Tire Size Calculator
Tire size
225/60R16
Sidewall height
135.00 mm
Sidewall height
5.315 in
Overall diameter
26.630 in
Section width
8.858 in
Circumference
2,124.97 mm
Circumference
83.660 in
Revolutions per mile
757.35 rev/mi
Revolutions per kilometre
470.59 rev/km
Original tire diameter
676.40 mm
Service type
P-metric passenger car
Construction
Radial
Load index
97
Maximum load per tire
730 kg
Maximum load per tire
1,609 lb
Speed symbol
H
Speed rating
210 km/h
Speed rating
130.5 mph
Worked out from NHTSA, Tire terminology and size designation and 4 other sources.
These are nominal dimensions derived from the size code. A mounted tire measures slightly differently depending on rim width, inflation pressure, load and wear.

How this is worked out

6 steps
  1. Decoded "P225/60R16 97H": section width 225 mm, aspect ratio 60%, rim 16 in.
  2. Sidewall height h = 225 x 60 / 100 = 135 mm.
  3. Overall diameter d = 16 x 25.4 + 2 x 135 = 676.4 mm.
  4. Circumference c = pi x 676.4 = 2124.9733 mm.
  5. Revolutions per mile = 1,609,344 / 2124.9733 = 757.348.
  6. Service description 97H: load index 97 = 730 kg per tire, speed symbol H = 210 km/h.

Results are general information, not financial, tax, legal, medical or engineering advice.