Tire Age Calculator
Calculate tire age from the DOT date code. Read the 4-digit week and year code and get the age in years and months.
Calculate age from a DOT date code.
Tire Age Calculator: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How Tire Age Calculator Works?
The Tire Age Calculator works by reading the last 4 digits of the DOT code as week and year of manufacture and subtracting that date from today. The tool uses 3 steps.
Find the DOT code
Look on the sidewall for DOT followed by letters and numbers, ending in a 4-digit group such as 3323.
Split the code
The calculator reads 33 as week 33 and 23 as 2023.
Read the age
The calculator subtracts mid-August 2023 from today and returns about 3.3 years in November 2026.
Tire Age Calculator Formula
The Tire Age Calculator formula is Age = Today − Date(week WW, year 20YY), where the DOT code ends in WWYY.
WWYY → week WW, year 20YYD = Jan 1 of 20YY + (WW − 1) × 7 daysAge = (Today − D) ÷ 365.25- WW
- Week of manufacture (01–53)
- YY
- Last 2 digits of the year
- D
- Approximate manufacture date
Worked example
A DOT code ending in 0824 means the tire was made in week 8 of 2024 (late February 2024). In November 2026, the tire is about 2.8 years old.
Tire Age Calculator Conversion Table
The Tire Age Calculator conversion table decodes 8 sample DOT date codes and the tire age in November 2026.
| DOT date code | Manufactured | Age | Note |
|---|---|---|---|
| 0119 | Week 1, 2019 | 7.9 years | Inspect yearly |
| 2620 | Week 26, 2020 | 6.4 years | Inspect yearly |
| 4521 | Week 45, 2021 | 5.0 years | Inspect yearly |
| 1022 | Week 10, 2022 | 4.7 years | — |
| 3323 | Week 33, 2023 | 3.3 years | — |
| 0824 | Week 8, 2024 | 2.8 years | — |
| 4125 | Week 41, 2025 | 1.1 years | — |
| 1526 | Week 15, 2026 | 0.6 years | — |
What is Tire Age Calculator?
A Tire Age Calculator is a tool that converts the 4-digit DOT date code on a tire into the tire's age. The US Department of Transportation (DOT) code appears on every tire sold in the United States.
Tires made before 2000 use a 3-digit code. Those tires are more than 25 years old and are past any reasonable service life.
Rubber ages even when unused. Many tire makers advise yearly inspection from 5 years and replacement at 10 years from manufacture. Several vehicle makers advise replacement at 6 years.
What are the uses of Tire Age Calculator?
There are 4 main uses of the Tire Age Calculator, including new tire delivery checks and used car inspections.
New tire delivery checks
Confirm new tires were not stored for years.
Used car inspections
Find aged tires on a car before purchase.
Spare tire checks
Check the age of a rarely used spare.
RV and trailer care
Track age on low-mileage vehicles that age out before wearing out.
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