Booster car seats
Positions the vehicle's lap-and-shoulder belt on an older child (~40-100+ lb). High-back or backless. NOT for air travel (planes have no shoulder belt).
Short answer: Going by each maker's manual, high-back booster mode goes up to 120 lb on the 10 seats that have it, and backless booster mode up to 120 lb. Useful life is 7 to 10 years where the manual gives one.
Weight limits and useful life, seat by seat
The weight ranges each maker prints in the seat's manual. Tap a seat to see it side by side with a similar model, with height limits and a link to its manual.
| Car seat | High-back booster | Backless booster | Useful life |
|---|---|---|---|
| Graco TurboBooster 2.0 | 40–100 lb | 40–100 lb | 10 yrs |
| Chicco KidFit ClearTex Plus | 40–100 lb | 40–110 lb | — |
| Clek Oobr | 40–100 lb | 40–100 lb | 9 yrs |
| mifold Grab-and-Go | — | 40–100 lb | 7 yrs |
| Graco RightGuide Portable | — | 50–120 lb | 10 yrs |
| Graco TurboBooster LX | 30–100 lb | 40–110 lb | 10 yrs |
| Evenflo Big Kid | 40–110 lb | 40–110 lb | — |
| Diono Monterey 4DXT | 40–120 lb | 40–120 lb | 8 yrs from purchase |
| Nuna AACE | 40–110 lb | 50–120 lb | 10 yrs |
| Clek Ozzi | — | 40–120 lb | 9 yrs |
| Chicco GoFit Plus | 40–110 lb | 40–110 lb | — |
| Graco Affix Highback | 30–100 lb | 40–100 lb | 10 yrs |
| Britax Highpoint | 40–120 lb | 48–120 lb | 10 yrs |
| Diono Solana 2 | — | 40–120 lb | 8 yrs from purchase |
| Cosco Topside | — | 40–100 lb | 10 yrs |
Common questions
Up to what weight can these be used as a booster?
In high-back booster mode the maximum is between 100 and 120 lb; the Diono Monterey 4DXT and the Britax Highpoint go to 120 lb. As a backless booster the maximum is between 100 and 120 lb. A booster also needs the seat belt to fit your child, so check the height range in the manual too.
How long do booster car seats last before they expire?
The manuals list a useful life of 7 to 10 years. Most count from the date of manufacture; the Diono Monterey 4DXT and the Diono Solana 2 count from the date of purchase. For 3 of the 15, the manual we cite gives no figure, so check the label on the seat. More by brand on car seat expiration.
Which of these booster car seats are narrow enough for 3-across?
6 of the 15 are made narrow for fitting three across: the Clek Oobr, the mifold Grab-and-Go, the Graco RightGuide Portable, the Diono Monterey 4DXT, the Clek Ozzi and the Diono Solana 2. Whether three fit depends on your back seat, so test-fit in your car.
Other stages: Infant · Convertible · All-in-one · narrow seats for 3-across