Automotive
Tire Life Calculator
Estimate how many more miles your tires will last based on original tread depth, current tread depth, and miles already driven.
New tires are commonly ~10/32in deep
2/32in (~1.6mm) is the commonly cited US legal minimum; the UK/EU legal minimum is also 1.6mm (about 2/32in), so 2/32in is a reasonable default either way.
Tire Life Estimate
Tread Worn So Far 0
Wear Rate 0
Estimated Remaining Miles 0
Estimated Total Tire Life 0
How much tread (and miles) might be left?
US tires are often measured in 32nds of an inch. 2/32 in is the common legal-bald number in many states; 4/32 is a safer rain cutoff. This page estimates remaining miles from how fast you have worn so far — it assumes a steady wear rate, which winter, alignment, and inflation will break.
Replace for reasons this math cannot see
- Sidewall cracks, bulges, punctures in the shoulder
- Age (many makers talk about 6–10 years even with tread left)
- Uneven wear = alignment, not “more miles on this formula”
Frequently Asked Questions
How do I measure tire tread depth?
Use a tread depth gauge, or the 'penny test' (insert a penny with Lincoln's head down into the tread groove — if you can see all of his head, tread is worn below about 2/32 inch). Tread depth is measured in 32nds of an inch in the US.
What is the legal minimum tire tread depth?
In the US, 2/32 inch (about 1.6mm) is the commonly cited legal minimum in most states. The UK and EU legal minimum is also 1.6mm, which is roughly equivalent to 2/32 inch, though some safety experts recommend replacing tires earlier, around 4/32 inch, for better wet-weather performance.
How is remaining tire life calculated?
First, calculate your wear rate: (Original Tread - Current Tread) / Miles Driven. Then divide the remaining usable tread (Current Tread - Legal Minimum) by that wear rate to estimate remaining miles.
How deep is a new tire's tread?
Most new passenger car tires start with about 10/32 inch to 11/32 inch of tread depth, though this varies by tire model and manufacturer.
Why might my tire wear estimate be inaccurate?
Tire wear isn't always linear — driving habits, alignment issues, tire rotation frequency, road conditions, and climate all affect wear rate over time, so this is an estimate based on your wear so far, not a guarantee.
Should I replace tires before they hit the legal minimum?
Many safety experts and tire manufacturers recommend replacing tires once tread reaches about 4/32 inch, especially for wet-weather driving, since stopping distance and hydroplaning resistance both degrade noticeably as tread wears down, even before the legal minimum.
Does tire rotation affect this estimate?
Yes — regular tire rotation helps tires wear more evenly, which can extend overall tire life. This calculator assumes your current wear rate (based on your inputs) will continue at the same pace going forward.
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About these results: Figures are for planning only. Confirm anything you will buy, bill, or submit (materials, payroll, medical screening) against the label, a quote, or a professional.