Tools · Car Seat
Illinois Car Seat & Booster Checker (2026)
Enter your child's age, height, and weight to see the minimum seat stage Illinois law requires and the first-offense fine ($75). This is the legal minimum — not best safety practice.
Illinois car seat checker
4′9″ = 57 in. Enter only the boxes you have — Illinois uses required to age 8; the “4′9″” figure is AAP/NHTSA guidance, not Illinois law.
- Child
- Not entered
- Minimum legal stage
- Enter age / height / weight
- Booster-exit rule
- required to age 8; the “4′9″” figure is AAP/NHTSA guidance, not Illinois law
- First-offense fine
- $75
Plain-language summary, not legal advice.
This shows the minimum legal requirement in Illinois — not best safety practice, which is usually stricter, and not legal or safety advice. Always follow your car seat's manufacturer instructions. For the full four-stage rules, front-seat rule, and citation, see the Illinois car seat law reference, cited to 625 ILCS 25/4 (penalty §25/6) (last reviewed 2026-07-09).
How Illinois car seat law works
Illinois legislates the rear-facing stage — under 2, unless the child is 40 lb or 40 in — and then, like Pennsylvania and Virginia, uses age alone for the booster exit. The important correction is that "4′9″" is not in the Illinois statute: the law is under 8, full stop. That figure is AAP/NHTSA guidance, and treating it as Illinois law would be inventing a threshold the legislature never wrote. Illinois also has no front-seat age law; back-seat-until-12/13 is a recommendation. The penalty is $75 first offense, $200 for a later one.
This checker shows the Illinois minimum legal requirement — not best safety practice, which is usually stricter — and is not legal or safety advice. For the full four-stage rules, front-seat rule, and citation, see the Illinois car seat law reference.
Car seat checkers for other states
Same tool, each with its own booster-exit rule.