10 Best Convertible Booster Car Seat of December 2025

• 3-in-1 harness booster helps protect your child, from toddler to youth
• Grows with your child from forward-facing harness (22-65 pounds) to highback booster (40-100 pounds) to backless booster (40-100 pounds) to continue to meet industry standards, we have increased the weight minimum from 30 to 40 pounds
• No-rethread simply safe adjust harness system allows the headrest and harness to adjust together in one motion
• Lightweight, portable seat is ideal for busy, active parents
• One-hand, 8-position adjustable headrest grows with your child
• 2 easy-to-clean cup holders keep your child's drinks and snacks close at hand
• Open-loop belt guides help properly position your vehicle’s seat belt
• Seat pad, body support, and harness covers are comfortable and machine washable
• Graco ProtectPlus Engineered: A combination of the most rigorous crash tests that helps to protect your little one in frontal, side, rear & rollover crashes
• Meets or exceeds the child restraint criteria for a frontal crash test under the US FMVSS 213

Graco

• JOY OF THE JOURNEY: From birth, keep your little one rear-facing longer to 40 lbs., and as they grow to 100 lbs. (10 years approx.) our long-range lifespan protects your child facing-forward.
• THREES NOT A CROWD: For safety that fits 3 across the Radian 3R packs all our innovative safety features into a sleek and slim design that allows you to fit three across (in most mid-size vehicles). Now the whole family can travel, together
• LOVINGLY ENGINEERED: The Radian 3R is built with automotive-strength steel, engineered into a dual spine, which manages and dissipates energy with an unyielding structure to protect your baby. Our audible click SuperLATCH system makes installation easy.
• BUSINESS CLASS COMFORT: Inspired by the best in European style, our Radian 3R has bright soft fabric covers, and a memory foam seat bottom. Lined with energy absorbing foam, comfort and safety go hand in hand
• MADE OF SEATTLE: We are from Seattle, a city where being different is the norm and so is the Radian 3R. It folds flat, so you can travel the world and is FAA approved for use on an aircraft, so you can take safety with you wherever you go.

DiONO

• Easy installation: Push button Latch connectors and built in lock offs make car seat installation a breeze
• No rethreading, ever: Quick adjust 10 position harness (8.5 to 17.5 inches) with headrest grows along with your child
• Easy clean up: Remove the car seat cover without removing the harness.Shoulder width:13 inch
• Designed for safety: 2 Layers of side impact protection, steel frame, impact absorbing base, and forward movement reducing v-shaped tether
• Fits: Rea facing 5 to 40 pounds and forward facing 20 to 65 pounds; Dimensions: 26 H x 18.5 W x 21 D inches; Shoulder Width: 13 inches

BRITAX

• REAR-FACING FOR LONGER: This slimfit convertible car seat is designed and engineered to keep your child rear facing even longer up to 50 lb/ 22. 7 kg, approx. 4 years old
• HIGH BACK BOOSTER: Keep your child safe and comfortable with the high back booster seat mode now up to 120 lb, 54 kg. The high back booster adds an extra layer of protection and comfort for any child transitioning into booster mode
• 10 YEARS ONE CAR SEAT: With 4 ways to travel safely from birth to booster, the Radian 3R adapts as your child grows to offer a custom adjustable fit from birth to 120 lbs
• REINFORCED STEEL CORE: Mechanically engineered, reinforced steel core, made from automotive grade high density plastic and steel to create the ultimate protection for your child
• THE ORIGINAL 3 ACROSS: Built with our famous radian slim fit convertible design, to fit 3 across in most vehicles without compromising child or passenger comfort. Feel safe having your children secure in the backseat

DiONO

• 3 car seats in 1 – Rear-facing for infants 4-50 pounds | Front-facing for toddlers 22-65 pounds and for big kids 30-100 pounds
• Made of Steel reinforced | Product dimensions – 20.75” D x 19” W x 24.5” H | Product weight – 19.25 lbs.
• 4-position extension panel adjusts to provide 5 inches of additional legroom, allowing your child to ride safely rear facing longer | 6-position recline helps keep your child comfy | 10-position headrest adjusts easily for your growing child
• Simply Safe Adjust Harness System adjusts the height of your harness and headrest in one motion to ensure that your child is always properly secured
• Graco ProtectPlus Engineered – A combination of the most rigorous crash tests that helps protect your child in frontal, side, rear & rollover crashes | Additional testing based on the New Car Assessment Program and for extreme car interior temperatures

Graco

• 10 years of use: One4Life convertible to booster car seat grows with your child from 5 - 120 lbs and up to 63" Tall
• Install confidently: With ClickTight Installation, you'll know it's right in 3 easy steps: open, thread & buckle, click it closed
• One4Life: Coverts from a rear-facing infant Car seat, to a forward-facing 5-point harness, to a high-back belt-positioning booster
• Cool N Dry fabric: Improves air flow for a cooler ride; wicks away moisture to help keep your child dry
• Britax safety: High strength steel frame & Crumple zone help absorb crash energy; patented V-shaped tether

BRITAX

• Designed to help protect your rear facing child from 5 40 pounds and your forward facing child from 22 65 pounds
• Simply Safe Adjust Harness System adjusts the harness and headrest height together with one easy motion no re threading required
• Graco ProtectPlus Engineered: a combination of the most rigorous crash tests that helps to protect your child in frontal, side, rear & rollover crashes; additional testing based on the New Car Assessment Program and for extreme car interior temperatures
• 8 position headrest is adjustable using one hand and easily adapts to your growing child's needs
• Hassle free installation in the rear facing position using LATCH and an easy to read level indicator

GRACO

• Integrated harness storage compartment holds unused harness straps while in the belt positioning booster mode
• One-hand, 5-position adjustable headrest is easy to use and adapts for your growing child.Do not use bleach
• Keeps your child in a booster up to 120 pounds for longevity of use, in keeping with American Academy of Pediatrics' recommendations
• Fuss Free harness storage holds the buckle out of the way, so it’s easy to get baby in and out. Harness straps may be spot cleaned
• Body support helps keep your child comfy.5-Point Harness Mode Height:27-49 inches

GRACO

• 4 seats in 1: 4-in-1 seat gives you 10 years of use--it seamlessly transforms from rear-facing harness (5-40 lb), to forward-facing harness (22-65 lb), to highback booster (40-100 lb), to backless booster (40-110 lb).
• Simply Safe Adjust Harness System: Adjust the height of your harness and headrest to 10 positions in one motion to ensure that your child is always properly secured.
• 10-position Headrest: One-hand, 10-position adjustable headrest is easy to use and grows to properly fit your growing child.
• 6-position Recline: Helps keep your growing child comfy on your many journeys together.
• Latch Equipped: For an easy installation.
• Graco ProtectPlus Engineered: a combination of the most rigorous crash tests that helps protect your child in frontal, side, rear & rollover crashes; additional testing based on the New Car Assessment Program and for extreme car interior temperatures

GRACO

• Built to grow with your child, this safety 1st car seat supports infants from 5 pounds to toddlers of 40 pounds as a rear facing car seat, 22 to 65 pounds forward facing toddler car seat, and 40 to 100 pounds as a belt positioning booster
• An adjustable 3 position recline makes it easy to get a good fit for the seat in your car, assembled product dimensions 24.00 inches x 19.00 inches x 23.75 inches
• Harness holders keep the harness open, making it easier to get into and out of the seat; Front seat passengers can enjoy up to 7 inches more legroom with the rear facing infant seat's reduced footprint
• Adjust the height of the headrest and harness in 1 easy step with the quickfit harness; Even in booster mode, the headrest adjusts easily, ensuring the best fit for your child
• Two integrated cup holders keep snacks and drinks close; Easy to clean, the seat pad removes easily, ready to go into the washing machine and dryer
• This car seat meets or exceeds federal, ASTM, and JPMA safety standards and includes a 1 year limited warranty
• Safety 1st believes parenting should have more joyful moments; As the first and only leader in child safety, safety 1st is here to give you peace of mind so you can spend less time worrying and more time enjoying every first you experience with your child

Safety 1st