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Audi A4 sizes and dimensions guide

In a sector as closely fought as the compact executive class, any competitor aiming to become a market leader needs to be almost faultless in every area, be it performance, refinement or running costs.

Audi is confident that the A4 delivers on all fronts, whether in saloon or estate ‘Avant’ form. So when it comes to practical facts like interior space and boot volume, how does the A4 compare to rivals including the Mercedes C-Class and BMW 3 Series?

Audi A4 external dimensions

The A4 is one of the largest cars in its class, with overall length stretching 102mm further than that of the BMW 3 Series. The extra size is unlikely to ever be too noticeable in daily driving, though. In terms of height, width, and wheelbase (the distance between the front and rear wheels) the A4 is very similar to its main rivals.

External dimensions
Length 4,726mm
Width 1,842mm
Height 1,427mm (Avant 1,434mm)
Wheelbase 2,820mm

Interior dimensions

For those carrying taller passengers, plenty of interior space is a must. Audi says that the latest A4 boasts more legroom than its predecessor, and it compares well to the Mercedes C-Class, too.

Front headroom matches the Merc to the nearest millimetre, which means that it’s 13mm ahead of the 3 Series. For those looking for the most headroom, the taller roof line of the Avant model means that rear headroom increases to 971mm.

Interior dimensions
Headroom (front/rear) 1,038mm/953mm (Avant 971mm)
Shoulder room (front/rear) 1,421mm/1,384mm
Elbow room (front/rear) 1,476mm/1,446mm

Boot space

In saloon form, the A4 boasts a 500-litre boot. That figure puts the A4 20 litres ahead of both the 3 Series and the C-Class – a marginal figure certainly, but maybe enough to sway some buyers.

It’s a similar story for the Avant, too, offering 505 where its two rivals can only offer 495 and 490 respectively. Fold the seats down, and they’re all very similar: the C-Class matches the A4’s capacity, while the BMW is just 10 litres behind.

Boot space (Saloon/Avant)
Seats up 500/505 litres
Seats down 965/1,510 litres

Turning circle and fuel tank capacity

If you live in a place where tight parking manoeuvres are commonplace, or if you frequently find yourself getting lost and need to turn around, the A4’s rivals are better options. It’s 11.5-metre turning circle is beaten by both the BMW (11.2m) and the Mercedes C Class (11m)

Depending on specification, the A4 is fitted with varying volumes of fuel tanks. The fuel-sipping ‘Ultra’ models are fitted with a fairly small 40-litre tank as standard, though buyers can choose a larger 54-litre tank if they wish. Meanwhile, 4×4 quattro derivatives – as the least economical in the range – are supplied with a larger 58-litre tank.

Turning circle and fuel tank
Turning circle 11.5 metres
Fuel tank 40/54/58 litres


Thanks to a combination of riding on a more modern platform and the latest construction techniques, the latest A4 weighs up to 120 kilos less than its predecessor – a big factor in its improved fuel efficiency. The lightest model in the range now weighs about the same as a mid-range Ford Focus – very impressive for a car of its size.

Lightest Heaviest
1,320kg (1.4 TFSI) 1,660kg (3.0 V6 TDI Quattro)

Save money on the Audi A4

Use our A4 configurator to see how much you could save off your new Audi – the UK’s top dealers will get in touch with their offers.

If you’re still researching then read our detailed reviews of both the Audi A4 Saloon and Avant models – they show how each compares to the class-leaders in all of the key areas.

To choose the A4 that best suits you, our colour guide discusses all of the exterior paint options available to buyers, and the prices of each. If you still aren’t sure what your next new car purchase will be, use our car chooser to help you narrow down your search.

Audi A4 Avant

A practical estate that’s spacious and comfortable
£30,660 - £47,730
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Audi A4

A spacious and comfortable family saloon with a great interior
£29,260 - £46,330
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