Short answer: the Honda Civic Sedan (2021) is bigger — it is 5.1 cm2 in51 mm shorter, 2 cm0.8 in20 mm wider and 2.5 cm1 in25 mm lower than the Mazda Mazda6 (2002).

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Honda Civic vs Mazda Mazda6

Honda Civic eleventh generation · 2021 · SedanMazda Mazda6 First generation · 2002 · Liftbackaligned at front bumper + ground · same scale
Honda Civic · 469.4 cm15 ft 5 in4,694 mmMazda Mazda6 · 474.5 cm15 ft 7 in4,745 mm Honda Civic · 141.5 cm4 ft 8 in1,415 mmMazda Mazda6 · 144 cm4 ft 9 in1,440 mm
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Honda Civic eleventh generation2021–present · Sedan
Length469.4 cm15 ft 5 in4,694 mm5.1 cm2 in51 mm shortervaries by version
Width180.1 cm5 ft 11 in1,801 mm2 cm0.8 in20 mm wider
Width incl. mirrors—no data
Height141.5 cm4 ft 8 in1,415 mm2.5 cm1 in25 mm lowervaries by version
Wheelbase273.6 cm9 ft 0 in2,736 mm6.1 cm2 in61 mm longer wheelbase
Ground clearance—no data
Boot (seats up)419 L US cu ft, converted 
Boot (seats folded)—no data
Weight1,305 kg US curb weight 
Mazda Mazda6 First generation2002–2008 · Liftback
Length474.5 cm15 ft 7 in4,745 mm5.1 cm2 in51 mm longervaries by version
Width178.1 cm5 ft 10 in1,781 mm2 cm0.8 in20 mm narrower
Width incl. mirrors—no data
Height144 cm4 ft 9 in1,440 mm2.5 cm1 in25 mm tallervaries by version
Wheelbase267.5 cm8 ft 9 in2,675 mm6.1 cm2 in61 mm shorter wheelbase
Ground clearance—no data
Boot (seats up)—no data
Boot (seats folded)—no data
Weight—no data

Dimensions may vary by trim, market and model year. For guidance only — check with the manufacturer before you buy. Sources are listed on each car's page.

Honda Civic Sedan (2021) vs Mazda Mazda6 (2002): the differences

Will they fit? UK parking bay and garage

CarParking bay 4.8 × 2.4 mSingle garage, 7 ft door
Honda Civic Sedan (2021)Fits, but tightDoesn't fitcheck my garage
Mazda Mazda6 (2002)Fits, but tightDoesn't fitcheck my garage

Assumes a UK standard parking bay of 4.8 × 2.4 m and a typical UK single garage of 4.8 × 2.4 m inside (2.1 m high) with a 7 ft × 6 ft 6 in (213 × 198 cm) up-and-over door. Where we have no width-with-mirrors figure we add 20 cm to the body width. “Comfortably” leaves about 60 cm to walk round and open a door; “tight” means it goes in but getting out is awkward. Garages and bays vary a lot — measure yours and use the garage fit checker. For guidance only.

See the full specifications and sources: Honda Civic Sedan (2021) · Mazda Mazda6 (2002). Dimensions may vary by trim, market and model year.

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