Spec Sizes

Porsche 911 vs BMW i8 Dimensions & Size Comparison

Comparing 2021 vs 2020 catalog dimensions. Porsche 911 · BMW i8

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 i8 width76.5 in

Which is bigger?

  • Length: Porsche 911 is 6.7 in shorter (178.3 in vs 184.9 in)
  • Width: Porsche 911 is 2.6 in narrower (73.9 in vs 76.5 in)
  • Height: Porsche 911 is 0.5 in taller (51.2 in vs 50.8 in)
  • Wheelbase: BMW i8 has a 13.7 in longer wheelbase (96.5 in vs 110.2 in)
  • Curb weight: BMW i8 is 14 lb heavier (3,572 lb vs 3,586 lb)

Biggest size differences

  1. Wheelbase: BMW i8 has a 13.7 in longer wheelbase (96.5 in vs 110.2 in)
  2. Length: Porsche 911 is 6.7 in shorter (178.3 in vs 184.9 in)
  3. Width: Porsche 911 is 2.6 in narrower (73.9 in vs 76.5 in)
  4. Height: Porsche 911 is 0.5 in taller (51.2 in vs 50.8 in)
  5. Curb weight: BMW i8 is 14 lb heavier (3,572 lb vs 3,586 lb)

Practical verdicts

  • Easier to fit in a short garagePorsche 911 — Porsche 911 is shorter by 6.7 in Check garage fit for Porsche 911 · garage fit for BMW i8
  • Narrower for tight parkingPorsche 911 — Porsche 911 is narrower by 2.6 in
  • Smaller exterior footprintPorsche 911 — Based on length × width (Porsche 911)

Dimension comparison

SpecPorsche 911BMW i8Difference
Length178.3 in184.9 in6.7 in
Width73.9 in76.5 in2.6 in
Height51.2 in50.8 in0.5 in
Wheelbase96.5 in110.2 in13.7 in
Curb weight3,572 lb3,586 lb14 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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