All-in-one car seats (also called 3-in-1 or 4-in-1 seats) start as rear-facing infant seats, convert to forward-facing harnessed seats, and finally become belt-positioning boosters. They're the most economical long-term choice. Our testing evaluates performance across all three modes.
2 seats found
#1
Best Convertible
Graco
4Ever DLX 4-in-1
Safety9/10
9.1/10
Weight: 4–120 lbs
Height: Up to 57 inches
Install: LATCH
Price: $329
Top Pros
- Grows from infant to booster (4–120 lbs)
- Excellent crash test analysis
- Easy-to-use harness system
#2
Best Budget
Safety 1st
Grow and Go All-in-1
Safety7.5/10
7.8/10
Weight: 5–100 lbs
Height: Up to 54 inches
Install: LATCH
Price: $119
Top Pros
- Excellent value for the price
- Grows from 5 to 100 lbs
- Easy harness adjustment
Buying Tips from Our Experts
- 1Verify the seat fits in your vehicle in all three modes
- 2All-in-one seats are large — measure your car's back seat
- 3Consider whether you'll actually use it as a booster
- 4Look for a high rear-facing weight limit
- 5Check harness height range covers your child's growth
Frequently Asked Questions
Is an all-in-one seat worth the extra cost?
For most families, yes. You won't need to buy a separate booster seat, which saves money over time. The convenience of not switching seats is also a major benefit.
What's the difference between all-in-one and convertible?
A convertible seat converts from rear to forward-facing but doesn't include a booster mode. An all-in-one adds the booster stage, covering your child from birth to about 10 years.