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BMW 4 Series & Convertible sizes & dimensions guide

The BMW 4 Series is the two door version of the 3 Series and benefits from many of the compact executive’s virtues – strong engines, impeccable interior quality – and packages them in a more rakish sporty shape, in either Coupe or Convertible body styles.

So, is the 4 Series too much of a compromise for most buyers, or can it be a useful, sensible daily driver? We’ve taken a look at the key measurements to find out. Don’t forget, you can put either the BMW 4 Series or the BMW 4 Series Convertible in our car configurator to see how much carwow could help you save.

BMW 4 Series and Convertible exterior dimensions

Sitting on the same platform as the 3 Series, the 4 Series takes up an almost identical amount of space on the road. Subtly re-profiled front and rear bumpers means that the 4 Series is 14mm longer, while the swoopy roof means the 3 Series stands 52mm taller.

Exterior dimensions
Length 4,638mm
Width 1,825mm
Height 1,377mm
Wheelbase 2,810mm

BMW 4 Series and Convertible interior dimensions

While the 4 Series shares plenty of parts with 3 Series saloon, the swoopier roofline and removal of the two rear doors means cabin space in the 4 Series isn’t quite as generous. Rear headroom, in particular, has taken a hit – the 3 Series saloon offers 40mm more. Despite this, it’s still impressive for a four-seat coupe, and even adults shouldn’t complain too much once they’re inside.

Curiously, even with the roof up, the Convertible offers slightly more headroom, though rear seat passengers are forced to sit closer together making it feel a little more cramped overall.

Interior dimensions (Coupe)
Headroom (front/rear) 1,011mm/917mm
Elbow room 1,465mm/1,400mm
Interior dimensions (Convertible)
Headroom (front/rear) 1,025mm/942mm
Elbow room 1,466mm/1,321mm

BMW 4 Series and Convertible boot space

The coupe’s 445-litre boot means it fares well in the practicality stakes, offering more boot space than a typical family hatchback – though the space is accessed through a much narrower opening. The gubbins required to make the Convertible’s roof open and close reduces overall volume quite considerably so be aware of this if you’re looking to buy one.

Boot space
Coupe 445 litres
Convertible (roof up/down) 370/220 litres

BMW 4 Series and Convertible turning circle and fuel tank

Depending on the fuel you choose to power your 4 Series, it comes with either a 60-litre tank (petrol) or a 57-litre one (diesel). The 60.1mpg-rated 420d is the most economical model in the lineup and, should you brim its tank – and match the claimed fuel consumption figure – a range of around 750 miles should be achievable.

Turning circle and fuel tank
Turning circle 11.3 metres
Fuel tank (petrol/diesel) 60/57 litres

BMW 4 Series and Convertible weight

Removing a car’s roof tends to have an adverse affect on the car’s structural rigidity. In order to restore some strength, additional bracing is fitted to prevent it from feeling too wobbly. This, combined with the mechanism to operate the 4 Series’ metal folding roof, means the system adds around 220kg on top of the Coupe. As a result, the Convertible feels slower and less agile than the Coupe, and uses more fuel, too.

Adding further weight is the optional four-wheel drive system, or ‘xDrive’ as it is known in BMW‘s range. These two additions means there’s a full 420kg of difference between the weight of the lightest and heaviest 4 Series models.

Lightest Heaviest
1,505kg (420i Coupe) 1,925kg (435d xDrive Convertible)

What next?

Put either the BMW 4 Series or the BMW 4 Series Convertible in our car configurator to see how much carwow could help you save. For more options, head over to our deals page or, if you still need help picking your next car, check out our car chooser.

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