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Tire Wear Mileage Calculator

Enter the new, current and legal tread depths plus miles driven to estimate remaining tire life.

How it is calculated

The tool assumes the tread wears away at a constant rate. All three depths are entered in 32nds of an inch, as tread gauges show them. First the wear rate: rate = (new − current) ÷ miles driven. Then the remaining life is the tread left above the legal limit divided by that rate: remaining = (current − limit) ÷ rate, and total life is miles driven + remaining. The legal limit defaults to 2 (2/32 in, which is 1.6 mm) if left empty. The new depth must be greater than the current depth, and the current depth must be greater than the limit, otherwise no result is shown. Miles are the miles on these tires, and results are in miles.

Worked example

A tire started at 10/32 in and measures 7/32 in after 15,000 miles, with a legal limit of 2/32 in. Wear rate = (10 − 7) ÷ 15,000 = 0.0002 per mile, or 1/32 in every 5,000 miles. Tread above the limit = 7 − 2 = 5. Remaining = 5 ÷ 0.0002 = 25,000 miles. Total life = 15,000 + 25,000 = 40,000 miles.

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Common mistakes

  • Entering depths in millimetres or inches in some fields and 32nds in others. All three fields use 32nds; a 6 mm tread is about 8 (8/32 in) and a 1.6 mm limit is about 2.
  • Measuring in a worn groove or only one spot. Wear differs across the tire; use the shallowest reading from the main grooves.
  • Entering the miles on the car instead of the miles on these tires, which makes the wear rate far too low and the remaining life far too long.
  • Trusting the projection after very short mileage. With only a few thousand miles, a 1/32 in gauge-reading error shifts the estimate by thousands of miles. Remeasure and recalculate as the tire wears.
  • Treating the legal limit as a safe replacement point. Wet grip is reduced well before 2/32 in, so many drivers replace earlier.

About this calculator

This calculator projects how many more miles a tire will last by treating tread wear as a linear rate: the tread lost so far (new depth minus current depth), divided by the miles driven, gives a wear rate in 32nds of an inch of tread per mile. That rate is then applied to the tread still remaining above the legal minimum to estimate remaining life.

It's the same reasoning tire shops and fleet managers use to schedule replacements proactively — most jurisdictions set the legal tread limit at 2/32 inch (1.6 mm), below which grip and wet-weather safety drop sharply.

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Comments (1)

  • Editorial team

    The limit box does not have to be the legal minimum. If you would rather replace tires earlier, type a higher number: with the default 10 new, 6 now and 30,000 miles, a limit of 2 gives 30,000 miles left, while a limit of 4 gives 15,000. Measure again at each service. If the remaining miles fall faster than the miles you drive, wear is speeding up, which this constant-rate model cannot show.

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