Spec Sizes

Porsche 911 vs BMW M4 Dimensions & Size Comparison

Comparing 2021 catalog dimensions. Porsche 911 · BMW M4

Same scale for both vehicles. Generic silhouette — proportional to measured length, height, width, wheelbase, and clearance.

Side view
  • Length177.9 in – 178.6 in
  • Height51.1 in – 51.3 in
  • Wheelbase96.5 in
  • Curb weight3,354 lb – 3,790 lb
Front / width
  • Width72.9 in – 74.9 in
  • BMW M4 width74.3 in

Which is bigger?

  • Length: Porsche 911 is 10.8 in shorter (178.3 in vs 189.1 in)
  • Width: Porsche 911 is 0.4 in narrower (73.9 in vs 74.3 in)
  • Height: BMW M4 is 3.6 in taller (51.2 in vs 54.8 in)
  • Wheelbase: BMW M4 has a 16.0 in longer wheelbase (96.5 in vs 112.5 in)
  • Curb weight: BMW M4 is 283 lb heavier (3,572 lb vs 3,855 lb)

Biggest size differences

  1. Wheelbase: BMW M4 has a 16.0 in longer wheelbase (96.5 in vs 112.5 in)
  2. Curb weight: BMW M4 is 283 lb heavier (3,572 lb vs 3,855 lb)
  3. Height: BMW M4 is 3.6 in taller (51.2 in vs 54.8 in)
  4. Length: Porsche 911 is 10.8 in shorter (178.3 in vs 189.1 in)
  5. Width: Porsche 911 is 0.4 in narrower (73.9 in vs 74.3 in)

Practical verdicts

  • Easier to fit in a short garagePorsche 911 — Porsche 911 is shorter by 10.8 in Check garage fit for Porsche 911 · garage fit for BMW M4
  • Narrower for tight parkingPorsche 911 — Porsche 911 is narrower by 0.4 in
  • Smaller exterior footprintPorsche 911 — Based on length × width (Porsche 911)

Dimension comparison

SpecPorsche 911BMW M4Difference
Length178.3 in189.1 in10.8 in
Width73.9 in74.3 in0.4 in
Height51.2 in54.8 in3.6 in
Wheelbase96.5 in112.5 in16.0 in
Curb weight3,572 lb3,855 lb283 lb

Values use trim midpoints when a model year lists a range (e.g. length 177.9 in – 178.6 in).

Compare by year

Overlapping model years with dimension data.

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