Short answer: the BMW 5 Series Sedan (2023) is bigger — it is 34.7 cm longer, 7.3 cm wider and 6.9 cm taller than the BMW 3 Series Sedan (2018).

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BMW 3 Series vs BMW 5 Series

BMW 3 Series G20 · 2018 · SedanBMW 5 Series G60 BMW 5 Series · 2023 · Sedanaligned at front bumper + ground · same scale

Side Front Rear

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BMW 3 Series G202018–2026 · Sedan

Length471.3 cm15 ft 6 in4,713 mm34.7 cm shorter

Width182.7 cm6 ft 0 in1,827 mm7.3 cm narrower

Width incl. mirrors—no data

Height144.6 cm4 ft 9 in1,446 mm6.9 cm lower

Wheelbase285.1 cm9 ft 4 in2,851 mm14.4 cm shorter wheelbase

Ground clearance14.1 cm0 ft 6 in141 mm0.5 cm less ground clearance

Boot (seats up)375 L115 L less boot space

Boot (seats folded)—no data

Weight1,910 kg EU, incl. driver170 kg lighter

BMW 5 Series G60 BMW 5 Series2023–present · Sedan

Length506 cm16 ft 7 in5,060 mm34.7 cm longer

Width190 cm6 ft 3 in1,900 mm7.3 cm wider

Width incl. mirrors—no data

Height151.5 cm5 ft 0 in1,515 mm6.9 cm taller

Wheelbase299.5 cm9 ft 10 in2,995 mm14.4 cm longer wheelbase

Ground clearance14.6 cm0 ft 6 in146 mm0.5 cm more ground clearance

Boot (seats up)490 L115 L more boot space

Boot (seats folded)—no data

Weight2,080 kg EU, incl. driver170 kg heavier

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.

BMW 3 Series Sedan (2018) vs BMW 5 Series Sedan (2023): the differences

The BMW 3 Series Sedan (2018) is 34.7 cm shorter, 7.3 cm narrower and 6.9 cm lower than the BMW 5 Series Sedan (2023).
Its wheelbase is 285.1 cm against 299.5 cm (14.4 cm shorter).
Its ground clearance is 14.1 cm against 14.6 cm (0.5 cm less).
Boot space with the seats up is 375 litres in the BMW 3 Series Sedan (2018) and 490 litres in the BMW 5 Series Sedan (2023) (115 litres less).
The BMW 3 Series Sedan (2018) weighs 1,910 kg and the BMW 5 Series Sedan (2023) 2,080 kg — about 170 kg lighter.

Will they fit? UK parking bay and garage

Car	Parking bay 4.8 × 2.4 m	Single garage, 7 ft door
BMW 3 Series Sedan (2018)	Fits, but tight	Doesn't fit	check my garage
BMW 5 Series Sedan (2023)	Doesn't fit	Doesn't fit	check 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: BMW 3 Series Sedan (2018) · BMW 5 Series Sedan (2023). Dimensions may vary by trim, market and model year.