The current Mercedes-Benz A-Class is 3,883 mm long, 1,764 mm wide and 1,593 mm tall, on a 2,568 mm wheelbase. It has grown 31 cm longer since the 1997 A-Class.
| Years | Length | Width | Height | Wheelbase | Boot capacity | Turning circle |
|---|---|---|---|---|---|---|
| 1997–2001 | 3,575 | 1,719 | 1,599 | 2,423 | 389 | 10.3 |
| 2001–2004 | 3,682 | 1,719 | 1,581 | 2,499 | 390 | 10.4 |
| 2004–2008 | 3,838 | 1,764 | 1,594 | 2,568 | 435 | 11.0 |
| 2008–2012Current | 3,883 | 1,764 | 1,593 | 2,568 | 435 | 11.0 |
Exterior figures are manufacturer specifications for the A-Class, 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.