10 Best car seats that fit 3 acrosses of 2025

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Best Choice

1

Graco

Graco SlimFit3 LX 3-in-1 Car Seat, Kunningham
9.8

Exceptional

Our Rating
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Value for Money

2

Graco

Graco SlimFit3 LX 3-in-1 Car Seat, Katrina
9.5

Excellent

Our Rating
3

Safety 1st
Safety 1st Guide Convertible Car Seat, Fits 3 Across, Forward Facing and Rear Facing, Chambers

10% Off
Main highlights

Versatile Use Modes
Convertible design supports rear-facing 5-40 lbs and forward-facing 22-65 lbs.

Ideal for Small Vehicles
Fits three across in most back seats, perfect for compact cars.

Safety and Comfort
Highly praised for safety features and comfortable cushioning.
9.3

Excellent

Our Rating

9.3
lasts a long time

9.1
leg space

8.9
Comfort
4

Diono
Diono Radian 3R, 3-in-1 Convertible Car Seat, Rear Facing & Forward Facing, 10 Years 1 Car Seat, Slim Fit 3 Across, Gray Slate
Main highlights

Versatile Design
10-year lifespan, accommodates birth to booster, 4 modes in one.

Compact Fit
Ideal for small cars, fits three across without compromising safety.

Safety and Comfort
Reinforced steel frame and plush memory foam praised for safety and comfort.
9.0

Excellent

Our Rating

9.5
Durability

9.5
leg space

9.3
Simple to clean
5

Graco
Graco SlimFit 3-in-1 Convertible Car Seat, Ultra-Space-Saving Design, Darcie, Suitable for Rear and Forward-Facing, Highback Booster Seat with 10-Position Headrest

25% Off
Main highlights

Versatile Growth Stages
Transforms from rear-facing to booster for 5-100 lbs.

Space-Saving Design
Slim profile with rotating cup holders for compact fit.

Highly Rated Durability
Sturdy construction praised for safety and longevity.
8.9

Very Good

Our Rating

9.9
materials Quality

9.9
lasts a long time

9.9
safety
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6

Diono
Diono Connect3 R Backless Booster Pack of 2, Slim Fit 3-Across in Many Mid-Sized Sedans and SUVs, for Children from 40-120 lbs., Lightweight with Cupholder, Blue Surge
Main highlights

Slim Design for 3-Across Fit
The Diono Connect3 fits three across in most cars without sacrificing interior space, ideal for families with multiple children.

Ideal for Growing Children
Suitable for children weighing 40-120 lbs, providing extended use and great value.

Praised Comfort and Convenience
Customers appreciate the booster’s comfort and the easy-to-use belt guides for secure installation.
8.8

Very Good

Our Rating
7

Safety 1st
Safety 1st Grand 2-in-1 Booster Car Seat, Forward Facing Car Seat with Harness, High Back Booster Seat for Car, 30-65 Pounds and Belt-Positioning Booster, Car Seats, 40-100 Pounds, Black Sparrow

20% Off
Main highlights

Versatile Use: Forward-Facing and Booster
Supports forward-facing with harness (30-65 lbs) and belt-positioning booster (40-100 lbs).

Ideal for Growing Families and Car Pools
Designed to fit three across in most vehicles, perfect for families.

Praised Feature: Easy Installation and Cleaning
Customers love the easy installation, cleaning, and compact design.
8.5

Good

Our Rating

9.7
Light weight

9.3
Easy installation

9.1
Comfort
8

Diono

Diono Connect3 R 2-in-1 High Back Booster, Slim Fit 3-Across in Many Mid-Sized Sedans and SUVs, for Children from 40-120 lbs., Lightweight with Cupholder, Blue Surge
8.4

Good

Our Rating
9

Cosco
Cosco Kids™ MightyFit™ LX Convertible Car Seat, Canyon
Main highlights

Comfortable and Long-Lasting
Provides a comfortable ride with rear-facing up to 40 pounds and forward-facing up to 65 pounds.

Ideal for Families
Perfect for families needing to fit three seats across in most vehicles.

Ease of Use
Praised for its easy installation and quick strap adjustments.
8.3

Good

Our Rating
10

Cosco
Cosco Kids Finale DX 2-in-1 Booster Car Seat, Forward Facing Toddler Car Seat (30-65 lbs) and Belt Positioning High Back Booster Seat (40-100 lbs), Sport Blue
Main highlights

Versatile Seating Options
The Cosco Finale DX 2-in-1 converts from harness to booster.

Ideal for Growing Families
Perfect for carpooling, fits three across the back seat.

Praised for Compact Design
Customers love its slim, lightweight build and easy portability.
8.2

Good

Our Rating

9.9
Light weight

9.5
Easy installation

9.5
Simple to clean

10 Best car seats that fit 3 acrosses of 2025

1

Graco SlimFit3 LX 3-in-1 Car Seat, Kunningham

How do we rank?

How do we rank?

Analyzing top stores

2

Graco SlimFit3 LX 3-in-1 Car Seat, Katrina

3

Safety 1st Guide Convertible Car Seat, Fits 3 Across, Forward Facing and Rear Facing, Chambers

9.3

9.1

8.9

4

Diono Radian 3R, 3-in-1 Convertible Car Seat, Rear Facing & Forward Facing, 10 Years 1 Car Seat, Slim Fit 3 Across, Gray Slate

9.5

9.5

9.3

5

Graco SlimFit 3-in-1 Convertible Car Seat, Ultra-Space-Saving Design, Darcie, Suitable for Rear and Forward-Facing, Highback Booster Seat with 10-Position Headrest

9.9

9.9

9.9

6

Diono Connect3 R Backless Booster Pack of 2, Slim Fit 3-Across in Many Mid-Sized Sedans and SUVs, for Children from 40-120 lbs., Lightweight with Cupholder, Blue Surge

7

Safety 1st Grand 2-in-1 Booster Car Seat, Forward Facing Car Seat with Harness, High Back Booster Seat for Car, 30-65 Pounds and Belt-Positioning Booster, Car Seats, 40-100 Pounds, Black Sparrow

9.7

9.3

9.1

8

Diono Connect3 R 2-in-1 High Back Booster, Slim Fit 3-Across in Many Mid-Sized Sedans and SUVs, for Children from 40-120 lbs., Lightweight with Cupholder, Blue Surge

9

Cosco Kids™ MightyFit™ LX Convertible Car Seat, Canyon

10

Cosco Kids Finale DX 2-in-1 Booster Car Seat, Forward Facing Toddler Car Seat (30-65 lbs) and Belt Positioning High Back Booster Seat (40-100 lbs), Sport Blue

9.9

9.5

9.5

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