Tools · Car Seat
Hawaii Car Seat & Booster Checker (2026)
Enter your child's age, height, and weight to see the minimum seat stage Hawaii law requires and the first-offense fine ($100 (first offense) + safety class). This is the legal minimum — not best safety practice.
Hawaii car seat checker
4′9″ = 57 in. Enter only the boxes you have. Hawaii uses a booster or harness is required from age 4 through 9; a belt is allowed at 10, or earlier (ages 7–9) only if the child is over 4′9″. The height exemption does not reach ages 4–6..
Heads up: Hawaii’s current tiers date to Act 122 (2022), which added the rear-facing (under 2) and rear/forward-facing (ages 2–3) rules and moved the 4′9″ exemption to ages 7–9. Summaries that describe an "under 4 car seat, 4–7 booster unless 4′9″" rule are quoting the pre-2022 version and are outdated.
- Child
- Not entered
- Minimum legal stage
- Enter age / height / weight
- Booster-exit rule
- a booster or harness is required from age 4 through 9; a belt is allowed at 10, or earlier (ages 7–9) only if the child is over 4′9″. The height exemption does not reach ages 4–6.
- First-offense fine
- $100 (first offense) + safety class
Plain-language summary, not legal advice.
This shows the minimum legal requirement in Hawaii, 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 Hawaii car seat law reference, cited to HRS §291-11.5 (last reviewed 2026-07-11).
How Hawaii car seat law works
Hawaii rewrote its child restraint law in 2022 (Act 122), and the current rules are stricter and more specific than the older summaries floating around. Under 2 must ride rear-facing, ages 2 through 3 may ride rear- or forward-facing, and both of those orientation rules are actually in the statute, so they are law in Hawaii rather than best practice. The booster stage runs from age 4 through 9. The 4′9″ height exemption is narrower than people expect: it lets only a child aged 7 through 9 move to a lap-and-shoulder belt, and only if the child is over 4′9″. A 5-year-old over 4′9″ still needs a booster. The first-offense penalty is up to $100 plus a required safety class of up to four hours. Hawaii sets no back-seat law, so front-seat placement is a recommendation here, not a rule.
This checker shows the Hawaii 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 Hawaii car seat law reference.
Car seat checkers for other states
Same tool, each with its own booster-exit rule.