Tire Wear Rate Calculator
Calculate measured tread wear per distance from two tread readings and the miles or km driven between them.
Calculate measured wear per distance.
Tire Wear Rate Calculator: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How Tire Wear Rate Calculator Works?
The Tire Wear Rate Calculator works by dividing the tread lost between 2 readings by the distance driven between those readings. The tool uses 3 steps.
Enter 2 readings
Type an earlier reading (10/32 in) and a later reading (7/32 in).
Enter distance
Type the miles or kilometers between readings, for example 12,000 mi (19,312 km).
Read the rate
The calculator returns 0.25/32 in per 1,000 mi, 0.12 mm per 1,000 km, and 4,000 mi per 1/32 in.
Tire Wear Rate Calculator Formula
The Tire Wear Rate Calculator formula is Wear rate = (TD₁ − TD₂) ÷ Distance.
r = (TD₁ − TD₂) ÷ DD₁ = D ÷ (n₁ − n₂)r_mm = ΔTD_mm ÷ D_km × 1,000 (mm per 1,000 km)- TD₁, TD₂
- Earlier and later tread readings
- D
- Distance between readings
- D₁
- Distance per 32nd of wear
Worked example
A tire wears from 11/32 in to 7/32 in over 15,000 mi (24,140 km). The rate is 2.67/32 in per 10,000 mi, or 3,750 mi (6,035 km) per 1/32 in.
Tire Wear Rate Calculator Conversion Table
The Tire Wear Rate Calculator conversion table converts 6 measured wear cases into rates per distance.
| Measured wear | Tread lost | Per 10,000 mi | mm per 10,000 km | Miles per 1/32 in |
|---|---|---|---|---|
| 1/32 in over 5,000 mi | 0.79 mm | 2.00/32 in | 0.99 mm | 5,000 mi |
| 2/32 in over 10,000 mi | 1.59 mm | 2.00/32 in | 0.99 mm | 5,000 mi |
| 3/32 in over 12,000 mi | 2.38 mm | 2.50/32 in | 1.23 mm | 4,000 mi |
| 4/32 in over 15,000 mi | 3.17 mm | 2.67/32 in | 1.32 mm | 3,750 mi |
| 2/32 in over 6,000 mi | 1.59 mm | 3.33/32 in | 1.64 mm | 3,000 mi |
| 5/32 in over 30,000 mi | 3.97 mm | 1.67/32 in | 0.82 mm | 6,000 mi |
What is Tire Wear Rate Calculator?
A Tire Wear Rate Calculator is a tool that turns 2 tread readings and the distance between them into a wear rate. A measured rate reflects the driver's roads, loads and habits better than a rated mileage.
Wear is not perfectly linear. New tread squirms and wears slightly faster during the first 2/32 in, and wear slows as blocks stiffen.
Reliable rates come from the same groove on the same tire, measured at least 5,000 mi (8,000 km) apart.
What are the uses of Tire Wear Rate Calculator?
There are 4 main uses of the Tire Wear Rate Calculator, including alignment problem detection and warranty claims.
Alignment problem detection
Spot a tire wearing faster than its axle partner.
Warranty claims
Show a measured wear rate against a mileage warranty.
Brand comparisons
Compare 2 models on the same vehicle.
Replacement projection
Feed the rate into a replacement date forecast.
Related Tread Wear & Tire Life Tools
View All 134 Subtools →Convert millimeters and thirty-seconds of an inch.
Compare measured remaining tread.
Estimate diameter reduction from tread loss.
Compare tread with a selected replacement threshold.
Compare tread readings across wheel positions.
Calculate age from a DOT date code.