Manufacturing Date (YYYY-MM-DD) Enter the tyre manufacturing date if known (e.g., 2020-06-15)

DOT Code Enter the DOT code from the tyre sidewall (last 4 digits show week/year)

Current Date (YYYY-MM-DD) Enter today's date or the reference date for calculation

Quick Examples:

New Tyre (1 year old) Mid-life Tyre (6 years old)

Calculate Clear

This calculator is for informational purposes only. It is not intended to provide professional automotive advice. Tyre condition depends on many factors including usage, storage, and wear patterns. Consult a qualified tyre specialist for safety-critical decisions about tyre replacement.

What Is Tyre Age

Tyre age is the amount of time that has passed since a tyre was manufactured. Tyres have a production date stamped on them, usually in the DOT code on the sidewall. Even if a tyre looks new and has never been driven on, the rubber materials can break down over time. Most tyre manufacturers recommend replacing tyres after 5 to 10 years, regardless of tread depth or appearance. This is because rubber compounds dry out and may crack, which could affect tyre performance and safety.

How Tyre Age Is Calculated

Formula

DOT Code Decoding

The calculation works by finding the number of days between two dates. First, the calculator determines when the tyre was made. You can either type the exact manufacturing date or provide the DOT code from the tyre sidewall. If you use the DOT code, the calculator reads the last four digits to find the week and year of production. Then it counts the days from that manufacturing date to your current date. Finally, it divides by 365.25 to convert days into years. This number accounts for leap years so the result stays accurate over long periods.

Why Tyre Age Matters

Knowing your tyre age helps you make informed decisions about vehicle safety. Old tyres may develop hidden problems even when they appear to be in good shape on the outside.

Why Tyre Age Is Important for Vehicle Safety

As tyres get older, the rubber compounds may degrade. This process is called oxidation. It can cause cracks in the rubber, reduced grip on wet roads, and a higher chance of tyre failure. Many experts suggest that tyres older than 6 to 10 years should be inspected by a professional, even if the tread looks fine. Using aged tyres may increase the risk of blowouts or loss of control, especially at highway speeds or in bad weather.

For Vehicle Owners

If you own a car, truck, or RV that does not get driven often, your tyres may age out before they wear out. Vehicles stored for long periods like classic cars, trailers, or spare tyres are especially prone to age-related degradation. Checking tyre age regularly can help you plan replacements before problems arise.

For Used Car Buyers

When buying a used vehicle, the tyres may look new but could be several years old. A tyre with deep tread might still be unsafe if it was manufactured many years ago and stored in poor conditions. This calculator can help you check the true age of tyres before making a purchase decision.

Tyre Age vs Tread Depth

Tyre age and tread depth measure different things. Tread depth shows how much rubber has worn off from driving. Tyre age shows how much time has passed since manufacture. A tyre can have full tread but still be too old for safe use. Both factors matter for tyre safety. Experts generally recommend checking both age and tread depth when deciding whether to replace tyres.

Example Calculation

Sarah bought a used car and wants to know how old the tyres are. She finds the DOT code on the tyre sidewall. The last four digits read 2418. She enters this code into the calculator along with today's date of June 15, 2026.

The calculator reads the DOT code 2418. The first two digits (24) mean the tyre was made in week 24. The last two digits (18) mean it was made in 2018. The calculator converts this to an approximate manufacturing date of June 11, 2018. Then it finds the number of days from June 11, 2018 to June 15, 2026, which equals about 2,923 days. Dividing by 365.25 gives roughly 8.00 years.

The results show: Tyre Age = 8.00 years, Tyre Age in Months = 96 months, Replacement Indicator = Yes (exceeds 6-year threshold).

This result suggests the tyres are about 8 years old. Based on common guidelines, these tyres may be approaching or past the recommended replacement window. Sarah may want to have them inspected by a tyre professional to assess their condition and consider replacement options.

Frequently Asked Questions

How do I find the DOT code on my tyre?

The DOT code is printed on the sidewall of every tyre. Look for letters and numbers that start with "DOT". The code is usually 10 to 13 characters long. The last four digits show the week and year of manufacture. You may need a flashlight to read it clearly.

How often should I check my tyre age?

It is a good practice to check tyre age once per year during routine vehicle maintenance. You may also want to check before long road trips, when buying a used vehicle, or if your vehicle has been stored for more than a year without being driven.

At what age should tyres be replaced?

Many tyre manufacturers recommend replacement after 5 to 10 years from the manufacturing date, even if the tyres appear usable. Some vehicle makers suggest 6 years as a inspection point and 10 years as a maximum limit regardless of condition. Check your vehicle owner's manual and tyre manufacturer guidelines for specific recommendations.

Can I use this calculator if my tyres were stored indoors?

Yes, this calculator works for any tyre regardless of storage conditions. However, keep in mind that storage environment affects ageing. Tyres stored in cool, dry, dark places away from sunlight and ozone sources may age more slowly than those stored in harsh conditions. A professional inspection provides the best assessment of actual tyre condition.