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About this tool
Read the DOT date code to find the week and year a tyre was made, its exact age today and the 6 and 10 year milestones.
The DOT Tire Identification Number moulded into a tyre's sidewall ends in a date code, and this decoder turns that code into a manufacture date and an exact age. Four digits mean week then two-digit year for anything built from 2000 onwards — 3624 is week 36 of 2024 — while a three-digit code marks a tyre made before 2000. From that date the tool derives the age in years and days, the point at which annual professional inspection is advised, and the ten-year mark most tyre manufacturers name as the limit.
Open Tyre DOT Date Decoder on AltFTool — it loads instantly in your browser.
Paste your code or data sample into the workspace.
Pick the format, conversion, or analysis you need.
Copy the polished result straight back into your project.
Paste the full DOT number or just the last four digits — the date group is found either way.
Age is returned in years, months and days from the production week, against any reference date you choose.
Shows the 6-year inspection point and the 10-year replacement limit as calendar dates.
Find the DOT number on the sidewall and read the last group of digits. Four digits are week then year: 3624 means week 36 of 2024, roughly the first week of September that year. Three digits mean the tyre was made before 2000 and the code alone cannot tell you the decade. The full code appears on only one sidewall, so check both sides.
Many vehicle manufacturers ask for tyres over six years old to be inspected annually, and most tyre manufacturers name ten years from the date of manufacture as the absolute limit regardless of tread depth. Neither figure is a legal limit — the legal test in India, the EU and the UK is 1.6 mm minimum tread depth plus overall condition.
A tyre stored properly does not start ageing meaningfully until it is fitted and loaded, so a code up to about two years old is common and generally accepted as new stock. Beyond that it is reasonable to ask for a fresher set or a discount, because the ten-year clock runs from manufacture, not from the day you bought it.
Yes. An unused spare ages by the same calendar clock even with full tread, which is why the spare is often the oldest tyre on a used vehicle. Check its DOT code as well as the four on the road, and keep it inflated — a space-saver is normally placarded at 60 psi.