Find the right car seat type for your child by age, weight, and height. Rear-facing, forward-facing, and booster recommendations.
Car seat selection is critical for child safety. The AAP recommends rear-facing as long as possible (at least until age 2), forward-facing with a harness until the child outgrows the seat, and booster seats until the seat belt fits properly (typically age 8-12).
Car seats are categorized by type: infant rear-facing (birth to ~35 lbs), convertible rear/forward-facing (birth to 65+ lbs), forward-facing with harness (up to 65 lbs), and booster seats (40-100 lbs). Many parents go through 2-3 seats as their child grows.
This calculator recommends the appropriate car seat type based on your child's age, weight, and height. It also flags when it's time to transition to the next stage. Whether you are a beginner or experienced professional, this free online tool provides instant, reliable results without manual computation. By automating the calculation, you save time and reduce the risk of costly errors in your planning and decision-making process.
Car seat safety rules have changed significantly in recent years. Longer rear-facing, higher weight limits, and new booster requirements mean parents need current guidance. This tool provides up-to-date AAP-aligned recommendations. Having a precise figure at your fingertips empowers better planning and more confident decisions. Manual calculations are error-prone and time-consuming; this tool delivers verified results in seconds so you can focus on strategy.
Infant rear-facing: Birth to ~30-35 lbs and 30-32" Convertible rear-facing: Up to 40-50 lbs (extended RF) Forward-facing (harness): 2+ years, 25-65 lbs, up to 49" Booster: 4+ years, 40-100 lbs, up to 57" Seat belt only: When belt fits properly (~4'9" tall)
Result: Convertible Seat — Rear-Facing
At 18 months, 24 lbs, and 32 inches, your child should be in a convertible car seat in the rear-facing position. The AAP recommends rear-facing until at least age 2 (ideally longer). The convertible seat allows continued rear-facing up to 40-50 lbs.
In a frontal crash (the most common type), a rear-facing seat distributes crash force across the entire back, head, and neck. A forward-facing child's head is thrown forward, putting enormous stress on the immature spinal cord. Rear-facing reduces serious injury risk by 500% for toddlers.
Most children go through 3-4 stages: infant seat (birth-12 months), convertible rear-facing (12-24+ months), forward-facing with harness (2-5 years), and booster (5-12 years). Some families use a 2-stage approach with an all-in-one seat that converts from rear to forward to booster.
Certified child passenger safety technicians (CPSTs) offer free car seat inspections. Find an event at nhtsa.gov/equipment/car-seats-and-booster-seats. Fire stations, hospitals, and police departments often offer inspections too.
The AAP recommends rear-facing until at least age 2, and ideally until the child outgrows the rear-facing height OR weight limit of the convertible seat (whichever comes first). Many seats allow rear-facing up to 40-50 lbs.
When they outgrow the forward-facing harness (typically over 40 lbs and 4+ years). The child must be mature enough to sit properly. Most children need a booster until age 8-12 or 4'9" tall.
The seat should not move more than 1 inch side-to-side or front-to-back at the belt path. The harness should be snug (no slack), with the chest clip at armpit level. Get a free inspection at a certified car seat check event.
Yes. Car seats expire 6-10 years after manufacture. Plastics degrade, safety standards evolve, and replacement parts become unavailable. Check the label or bottom of the seat for the expiration date.
Infant seats are convenient (carrier detaches from base) but max out around 30-35 lbs. Convertible seats last longer (rear AND forward), but don't detach. Many families use an infant seat first, then switch to convertible around 9-12 months.
Infant seats: $80-350. Convertible seats: $50-400. Forward-facing: $100-350. Boosters: $20-200. Higher price doesn't always mean safer — all seats sold in the US meet federal safety standards. Look for ease of installation and fit for your vehicle.