Tools · Car Seat
New Hampshire Car Seat & Booster Checker (2026)
Enter your child's age, height, and weight to see the minimum seat stage New Hampshire law requires and the first-offense fine ($50). This is the legal minimum — not best safety practice.
New Hampshire car seat checker
4′9″ = 57 in. Enter only the boxes you have. New Hampshire uses required while under 7 AND under 57 in; reaching age 7 or 4′9″ exits.
Heads up: The rear-facing-under-2 requirement (paragraph I-c) is recent: it took effect January 1, 2024. Older summaries that describe only the under-7 rule predate it.
- Child
- Not entered
- Minimum legal stage
- Enter age / height / weight
- Booster-exit rule
- required while under 7 AND under 57 in; reaching age 7 or 4′9″ exits
- First-offense fine
- $50
Plain-language summary, not legal advice.
This shows the minimum legal requirement in New Hampshire, 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 New Hampshire car seat law reference, cited to RSA 265:107-a (last reviewed 2026-07-11).
How New Hampshire car seat law works
New Hampshire changed its child-passenger law on January 1, 2024, and any summary that only mentions the under-7 rule is out of date. The statute now legislates two things by age: a child under 2 must ride rear-facing (paragraph I-c), and a child under 7 must be in a child restraint unless they are 57 in (4′9″) or taller. That puts New Hampshire among the states that actually codify the rear-facing stage rather than leaving it to best practice. The most-searched question, when a child can move to just a seat belt, has a clean answer here: age 7 or 4′9″, whichever comes first. New Hampshire does not have a rear-seat law, so riding in back is a recommendation, not a requirement. The first-offense fine is $50.
This checker shows the New Hampshire 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 New Hampshire car seat law reference.
Car seat checkers for other states
Same tool, each with its own booster-exit rule.