The current Smart forfour is 3,497 mm long, 1,665 mm wide and 1,553 mm tall, on a 2,494 mm wheelbase.
| Years | Length | Width | Height | Wheelbase | Boot capacity | Turning circle |
|---|---|---|---|---|---|---|
| 2004–2006 | 3,752 | 1,684 | 1,450 | 2,500 | 268 | 10.5 |
| 2014–2022Current | 3,497 | 1,665 | 1,553 | 2,494 | 185 | 8.7 |
The Smart forfour offers 760 mm of rear legroom and 910 mm of rear headroom, with 1,010 mm of legroom and 1,120 mm of headroom up front. Rear shoulder room measures 1,330 mm across.
| Front | Rear | |
|---|---|---|
| Legroom | 1,010 mm | 760 mm |
| Headroom | 1,120 mm | 910 mm |
| Shoulder room | 1,330 mm | 1,330 mm |
Interior figures are the roomiest measurement (seat fully back), taken as the median across the current generation’s variants; individual trims vary.
Exterior figures are manufacturer specifications for the forfour, averaged per generation across its variants and shown for the most common body style. Generations with the same size are merged. Boot capacity is the seats-up figure where the manufacturer quotes one.