Spec Sizes

BMW M4 vs Porsche 911 Dimensions & Size Comparison

Comparing 2021 catalog dimensions. BMW M4 · Porsche 911

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

Side view
  • Length189.1 in
  • Height54.8 in
  • Wheelbase112.5 in
  • Curb weight3,830 lb – 3,880 lb
Front / width
  • Width74.3 in
  • Porsche 911 width72.9 in – 74.9 in

Which is bigger?

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

Biggest size differences

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

Practical verdicts

  • Easier to fit in a short garagePorsche 911 — Porsche 911 is shorter by 10.8 in Check garage fit for BMW M4 · garage fit for Porsche 911
  • 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

SpecBMW M4Porsche 911Difference
Length189.1 in178.3 in10.8 in
Width74.3 in73.9 in0.4 in
Height54.8 in51.2 in3.6 in
Wheelbase112.5 in96.5 in16.0 in
Curb weight3,855 lb3,572 lb283 lb

Values use trim midpoints when a model year lists a range.

Compare by year

Overlapping model years with dimension data.

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