Tire Age Calculator — DOT Date Code Decoder
Decode your tire's DOT date code to find its manufacture date and exact age. Enter the last 4 digits from the DOT code stamped on the tire sidewall.
How to Read a DOT Date Code
The DOT code on the sidewall looks like: DOT U2LL LMLR 2319
The last 4 digits are the date code:
- First 2 digits = week of manufacture (01–53)
- Last 2 digits = year of manufacture
- Example: 2319 = Week 23 of 2019
Tire Age Guidelines
- Under 3 years: Like new
- 3–6 years: Good condition, inspect annually
- 6–10 years: Consider replacement; inspect every 6 months
- Over 10 years: Replace immediately regardless of appearance
Frequently Asked Questions
Where is the DOT date code on a tire?
Look for 'DOT' on the tire sidewall followed by a series of letters and numbers. The last 4 digits are the date code: first 2 digits = week, last 2 digits = year.
How old is too old for tires?
Most manufacturers recommend replacing tires after 6 years regardless of tread depth. At 10 years, replacement is mandatory even if tires look fine.