When does a car seat expire?
Every child car seat has a useful life set by its manufacturer, and this car seat expiration calculator turns the two facts printed on the seat — the date of manufacture and the lifespan in years — into the exact last day you should use it. It also shows how long is left, how much of the seat’s life has gone, and adds a calendar reminder a month before, so a replacement can be bought in time.
Some seats print the expiry (“do not use after”) date directly; switch the calculator to that mode to see the time left and, if you add the date of manufacture, the lifespan the maker chose. A second question covers crashes and second-hand seats, because a crash can end a seat’s life long before the date on the label.
The calculator does date maths only. It does not know any brand’s rules, and it never replaces the label, the manual or the manufacturer’s advice.
How to check your car seat’s expiration date
- Find the label: usually a white sticker on the back or base of the seat, or a date moulded into the plastic shell (often a clock-like dial). Infant carriers may have a separate date on the base.
- Enter the date of manufacture (DOM) and pick the lifespan the label or manual gives — or choose “Expiry date printed on the seat” and type that date.
- Say whether the seat has been in a crash or was bought used.
- Read the expiry date, the time left and the badge; press Add a reminder to save a calendar event a month before the last day.
Car Seat Expiration Calculator features
Exact date maths
Whole years are added to the manufacture date; 29 February becomes 28 February in non-leap years.
Two label styles
Works from a date of manufacture plus lifespan, or from a printed expiry date.
Time left and life used
Years, months and days left, a progress bar and a warning six months before the end.
Crash and second-hand check
Applies the minor-crash conditions quoted by the AAP from NHTSA.
Calendar reminder
A standard .ics file that opens in Google Calendar, Outlook and Apple Calendar.
Why car seats expire
Plastic shells and foam age with heat, cold and sunlight, harness webbing wears, and standards and fitting systems change. Manufacturers test a seat for a set number of years and print a lifespan on the label or in the manual — commonly somewhere between about 6 and 10 years from the date of manufacture, depending on the model. Booster seats often last longer than infant carriers, but the only number that counts is the one for your seat.
The lifespan runs from the day the seat was made, not the day you bought it, so a seat that sat in a warehouse has less time left. Worked example: a seat made on 15 March 2021 with a 7-year life must not be used after 15 March 2028. Checked on 25 October 2026, that leaves 1 year 4 months (507 days), and about 80% of its life is used.
Crashes, second-hand seats and recalls
- Moderate or severe crash: replace the seat, even if it looks fine.
- Minor crash: NHTSA does not require replacement if the vehicle could be driven away, the nearest door was undamaged, nobody was hurt, the airbags did not deploy and the seat shows no damage — but some manufacturers say to replace a seat after any crash.
- Used seats: the AAP advises avoiding a seat whose history you do not know, and never using one without the label showing the date of manufacture and model number, or with missing parts.
- Recalls: register your seat with the manufacturer and check for recalls with the maker or NHTSA (US); in the UK and India check with the manufacturer or retailer.
- To choose the right next seat for your child’s age and size, use the car seat stage finder.
Where the dates are printed
| Where to look | What it may say |
|---|---|
| Sticker on the back, side or base | “Date of manufacture”, “DOM”, “Manufactured on” with the model number |
| Moulded into the plastic | A dial or arrow pointing to a month next to a year |
| Label or manual | “Do not use after …”, “Expires …” or “Use for X years from date of manufacture” |
| Infant carrier and base | Each part can have its own date — use the earlier expiry |
Car Seat Expiration Calculator FAQ
How long after manufacture do car seats expire?
It depends on the model: many seats are rated for roughly 6 to 10 years from the date of manufacture. Check the label or the manual, then enter that lifespan in the car seat expiration calculator.
How do I check my infant car seat’s expiration?
Look for the date sticker on the carrier and on its base, or a date moulded into the shell. If the label states a lifespan rather than a date, add it to the date of manufacture — or let the calculator do it.
Is it illegal to use an expired car seat?
Rules differ by country and state. Whatever the law, manufacturers say not to use a seat after its expiry date, because they no longer stand behind its crash performance.
Does the expiry start from when I bought the seat?
No. It runs from the date of manufacture printed on the seat.
My seat has no label — can I still use it?
The AAP says not to use a seat without a label showing the date of manufacture and model number, because you cannot check its age or recalls.
Do I need a new car seat after a crash?
After a moderate or severe crash, yes. After a minor crash that meets all five NHTSA conditions, it is not required by NHTSA, but follow your manufacturer if it says to replace the seat after any crash.