Child Car Seat Fit Calculator

The right car seat depends on your child's age, weight, and height. Our calculator follows NHTSA guidelines to recommend rear-facing infant seats, convertible seats, or booster seats based on your child's current measurements and development stage.

Our recommendations are based on official NHTSA guidelines and safety standards. However, always check your specific car seat manufacturer's guidelines and consult with a certified Child Passenger Safety Technician for personalized advice.

Children should transition when they outgrow their current seat by height or weight limits, or reach the maximum age recommendation. Generally, keep children rear-facing until at least age 2, and in booster seats until the seat belt fits properly.

If your vehicle only has lap belts, you'll need a car seat that can be safely installed with just a lap belt. Many newer booster seats require lap and shoulder belts, so convertible seats or specific booster models may be necessary.

Yes, our calculator provides general recommendations based on safety guidelines that apply to all car seat brands. However, always verify that your specific car seat model supports your child's measurements and your vehicle type.

If you're uncertain about the recommendation, consult with a Certified Child Passenger Safety Technician (CPST) in your area. Many offer free inspections and can provide hands-on guidance for your specific situation.

Check your child's fit every few months, especially during growth spurts. Children typically outgrow car seats by height before weight, so measure regularly and watch for signs like the top of their head approaching the seat's height limit.