Tire Age Calculator & DOT Code Decoder
Find out exactly how old your tires are and whether they are still within the recommended safety window.
QUICK EXAMPLE
Your tire has DOT code 4B2K 1923. The last four digits 1923 mean it was manufactured in the 19th week of 2023. As of May 2026, that makes the tire roughly 36 months (about 3 years) old. Most vehicle and tire manufacturers recommend replacing tires once they reach around 6 years of age, and in any case no later than around 10 years from the date of manufacture — even if tread still looks good.
Tire Age
6yr
Manufactured
Week 18
2020
Age
6y 0m
72 months total
6–10 years old. Professional inspection required. Most manufacturers recommend replacement within this window.
Most vehicle manufacturers recommend tire replacement at 6–10 years from manufacture date, regardless of remaining tread depth.
Tire Age Safety Guide
| Age | Status | Recommendation |
|---|---|---|
| 0–5 years | Safe | Normal use. Annual visual inspection recommended. |
| 6–9 years | Caution | Professional inspection required. Plan for replacement. |
| 10+ years | Replace | Immediate replacement recommended by most manufacturers. |
AI Insight
Powered by AIGet a plain-English explanation of your results — what they mean for your vehicle and driving experience.
Tire Age Safety Guide
| Tire Age | Status | Recommendation |
|---|---|---|
| 0–3 years | Excellent | Normal use if tires are in good condition |
| 3–6 years | Serviceable | Inspect regularly for cracks, hardening, and damage |
| 6–10 years | High Risk | Plan replacement as soon as practical, especially for high-speed or heavy use |
| 10+ years | Very High Risk | Replace immediately; too old for regular road use |
Age bands are general guidance based on typical recommendations from vehicle and tire manufacturers. Always combine age information with a physical inspection for cracks, bulges, or other damage and follow the most conservative recommendation you receive from qualified professionals.
How to Use This Calculator
- Find the DOT Tire Identification Number (TIN) on your tire sidewall. It starts with "DOT" and ends with a 3‑ or 4‑digit date code.
- If your tire has a 4‑digit date code (for example, 1923), enter the full DOT code or just the last 4 digits into the calculator.
- If your tire has only a 3‑digit code at the end, it was manufactured before 2000 and is far beyond safe service age — treat it as needing immediate replacement.
- Click 'Decode & Calculate Age'.
- Review the manufacture week/year, current tire age in months/years, and the safety recommendation based on age bands.
Important: 3‑Digit DOT Codes = Pre‑2000 Tires
DOT Code & Tire Age Formula
About Tire Age, DOT Codes & Safety
Why Tire Age Matters More Than You Think
Tires are made of rubber and reinforcing materials that slowly break down over time due to heat, oxygen, UV light, ozone, and flexing. As a tire ages, its rubber can become harder and more brittle, and internal layers can separate. That is why a tire can look fine from the outside yet still be at greater risk of failure on a hot day at highway speed if it is many years past its manufacture date.
How Manufacturers and Safety Agencies View Tire Age
Guidance from vehicle and tire manufacturers, as summarized by agencies such as NHTSA, generally recommends that tires be inspected closely once they reach around six years old and removed from service no later than about ten years from the date of manufacture. Some brands and dealers are even more conservative, refusing to service or install tires beyond a certain age. These recommendations apply to spare tires as well, which can quietly age out while sitting unused in the trunk or under the vehicle.
Using This Tool as Part of a Safety Check
This calculator makes it easy to decode your DOT date code and see a clear estimate of your tire’s age, but it is only one part of a complete tire safety check. You should also monitor tread depth, watch for uneven wear, inspect for cracks, bulges, or cuts, maintain proper inflation pressure, and respect your tire’s load and speed ratings. When in doubt, choosing to replace older tires is almost always cheaper than dealing with a blowout or loss of control on the road.