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BMW 3 Series G20 vs Audi A4 B8: size comparison

  • Length About the same length
  • Width About the same width
  • Height 3 Series G20 15 mm0.6 in taller
  • Boot About the same

Car 1 blue, solid outline

3 Series G20 BMW · 2018–present · Sedan 3 Series G20 4,709 × 1,827 × 1,442 mm15 ft 5 in × 6 ft 0 in × 4 ft 9 in Change

Car 2 coral, dashed outline

A4 B8 Audi · 2007–2015 · Sedan A4 B8 4,703 × 1,826 × 1,427 mm15 ft 5 in × 6 ft 0 in × 4 ft 8 in Change
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  • Car 1, blue, solid outline: 3 Series G20
  • Car 2, coral, dashed outline: A4 B8
0 m1 m2 m3 m4 m5 m6 m1 m0 ft1 ft2 ft3 ft4 ft5 ft6 ft7 ft8 ft9 ft10 ft11 ft12 ft13 ft14 ft15 ft16 ft17 ft18 ft19 ft20 ft1 ft2 ft3 ft4 ftWheelbase 2,851 mmWheelbase 9 ft 4 inLength 4,709 mmLength 15 ft 5 in1,442 mm4 ft 9 inWheelbase 2,808 mmWheelbase 9 ft 3 inLength 4,703 mmLength 15 ft 5 in1,427 mm4 ft 8 in

Scale about 1:21 on a desktop screen · grid 500 mm1 ft · in Overlay both cars start at the front bumper Side view: dashed lines mark the axles

Dimensions and difference

The 3 Series G20 is 6 mm0.2 in longer, 1 mm0.0 in wider and 15 mm0.6 in taller than the A4 B8. Its wheelbase is 43 mm2 in longer.

Dimension3 Series G20A4 B8Difference, car 1 vs car 2
Length4,709 mm15 ft 5 in15 ft 5 in4,709 mm4,703 mm15 ft 5 in15 ft 5 in4,703 mm +6 mm+0.2 in +0.1%
Width1,827 mm6 ft 0 in6 ft 0 in1,827 mm1,826 mm6 ft 0 in6 ft 0 in1,826 mm +1 mm+0.0 in +0.1%
Height1,442 mm4 ft 9 in4 ft 9 in1,442 mm1,427 mm4 ft 8 in4 ft 8 in1,427 mm +15 mm+0.6 in +1.1%
Wheelbase2,851 mm9 ft 4 in9 ft 4 in2,851 mm2,808 mm9 ft 3 in9 ft 3 in2,808 mm +43 mm+2 in +1.5%
Footprint8.60 m²92.6 sq ft92.6 sq ft8.60 m²8.59 m²92.4 sq ft92.4 sq ft8.59 m² +0.02 m²+0.2 sq ft +0.2%
Boot480 L17.0 cu ft17.0 cu ft480 L480 L17.0 cu ft17.0 cu ft480 L Same
Kerb weight1,525–1,800 kg3,362–3,968 lb3,362–3,968 lb1,525–1,800 kg1,485–1,715 kg3,274–3,781 lb3,274–3,781 lb1,485–1,715 kg +40 kg+88 lb +2.7%

Width without mirrors. Figures come from the catalog version pages; the drawing uses the same numbers. Body outlines are generic for the body type - proportions are exact, styling is not. Weight difference compares the lightest versions.

Garage and parking

A typical single garage is about 5.5 × 3.0 m18 ft 1 in × 9 ft 10 in inside; a parking bay about 5.0 × 2.5 m16 ft 5 in × 8 ft 2 in. Room to open a door: about 600 mm2 ft each side.

3 Series G20

Single garage
Tight 791 mm2 ft 7 in to spare in length, 587 mm1 ft 11 in each side
Parking bay
Tight 291 mm11 in to spare in length, 337 mm1 ft 1 in each side

A4 B8

Single garage
Tight 797 mm2 ft 7 in to spare in length, 587 mm1 ft 11 in each side
Parking bay
Tight 297 mm1 ft 0 in to spare in length, 337 mm1 ft 1 in each side

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Frequently asked questions

Which is bigger, the BMW 3 Series G20 or the Audi A4 B8?

They are practically the same size. The 3 Series G20 is 6 mm longer, 1 mm wider and 15 mm taller than the A4 B8. Its wheelbase is 43 mm longer.

Will the BMW 3 Series G20 and the Audi A4 B8 fit in a standard garage?

In a typical single garage of 5.5 × 3.0 m inside: The BMW 3 Series G20 fits, but it is tight to get out (791 mm to spare in length, 587 mm each side). The Audi A4 B8 fits, but it is tight to get out (797 mm to spare in length, 587 mm each side). Widths are without mirrors; check your own garage with our garage checker.

Which has the bigger boot?

Both boots hold about the same: 480 L in the BMW 3 Series G20 and 480 L in the Audi A4 B8.

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