Radian 3QXT › fit in › Honda Civic Sedan

Will the Diono Radian 3QXT fit in a 2022–2024 Honda Civic Sedan?

Yes — the Diono Radian 3QXT fits a 2022–2024 Honda Civic Sedan, with a caveat.
The Radian 3QXT is about 17" wide; the Civic Sedan's usable rear bench is about 48". It fits one rear position comfortably. Three across is tight (51" needed vs 48"). Note: rear legroom here is limited, so a rear-facing install may crowd the front passenger.

17"Radian 3QXT width

48"Civic Sedan rear bench

Tightthree across

★★★☆☆NHTSA Ease-of-Use

Check the Radian 3QXT on Amazon → All seats for a Civic Sedan

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What fits this Civic Sedan

One seat, rear position: Yes. The Radian 3QXT installs in an outboard rear position of a 2022–2024 Honda Civic Sedan, though you may slide the front seat forward for rear-facing.
Three across: Tight — three need ~51" against only ~48". A narrower seat is the better bet.
Modes this seat covers: rear-facing → forward-facing → booster.
LATCH: lower anchors up to 40 lb; the Civic Sedan has 2 lower-anchor positions.

ℹ️ Informational only — built from NHTSA public car-seat ratings and published seat/vehicle dimensions. This is not a safety certification and not a substitute for the seat and vehicle manuals. Always confirm the fit and install yourself before every trip. The Radian 3QXT's width (Diono published spec (17 in)) and the Civic Sedan's rear-bench width (Typical for compact car — approximate, verify install in your vehicle) are both approximate — confirm with a test-fit before buying.

Common questions

Will the Diono Radian 3QXT fit in a 2022–2024 Honda Civic Sedan?

Yes — the Diono Radian 3QXT (17" wide) fits a single rear seating position in a 2022–2024 Honda Civic Sedan. Because this vehicle has limited rear legroom, a rear-facing install may require sliding the front seat forward. Three across is tight — its rear bench is about 48" and three of these would need 51".

Can you fit three Radian 3QXTs across a Civic Sedan?

Probably not — three Radian 3QXTs need about 51" but the Civic Sedan's usable bench is only about 48". Consider a narrower seat — see our narrowest-seats guide.

Sources: seat ratings & modes — NHTSA (pulled 2026-06-18); dimensions — manufacturer specs and owner measurements. Informational only — built from NHTSA public car-seat ratings and published seat/vehicle dimensions. This is not a safety certification and not a substitute for the seat and vehicle manuals. Always confirm the fit and install yourself before every trip.