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Automotive Calculators

Tyre Life Remaining Calculator

Verified formula Updated Jun 2026 Private — runs on your device

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mm
mm
mm
Verified formula Private

Tread life remaining

37.50%

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Tyre Life Remaining Calculator

The Tyre Life Remaining Calculator works out your tread life remaining in an instant. Enter current tread depth, new tread depth and legal minimum tread and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the current tread depth.
  2. Enter the new tread depth.
  3. Enter the legal minimum tread.
  4. Read off your tread life remaining — the calculator updates automatically, with no button to press.

Worked example

For example, with current tread depth of 4 mm, new tread depth of 8 mm and legal minimum tread of 1.6 mm, the tread life remaining is 37.50%.

Inputs used
Current tread depth 4 mm
New tread depth 8 mm
Legal minimum tread 1.6 mm
Results
Tread life remaining 37.50%

Results are estimates for educational use, not professional advice.

Frequently asked questions

Compare usable tread above the legal limit: (current − legal) ÷ (new − legal) × 100. 4 mm from 8 mm with a 1.6 mm limit is about 37.5% left.

It varies by country, commonly 1.6 mm. Below it, tyres are unsafe and illegal.

Use a tread depth gauge in the main grooves, or the built-in wear indicators.

Before reaching the legal limit, and sooner for wet-weather safety or uneven wear.

Enter the current tread depth. Enter the new tread depth. Enter the legal minimum tread. Read off your tread life remaining — the calculator updates automatically, with no button to press.

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