The current Opel Omega is 4,898 mm long, 1,776 mm wide and 1,505 mm tall, on a 2,730 mm wheelbase. It has grown 17 cm longer since the 1986 Omega.
| Years | Length | Width | Height | Wheelbase | Boot capacity | Turning circle |
|---|---|---|---|---|---|---|
| 1986–1989 | 4,730 | 1,772 | 1,481 | 2,730 | 540 | 10.9 |
| 1989–1994 | 4,768 | 1,772 | 1,481 | 2,730 | 540 | 10.9 |
| 1994–1999 | 4,819 | 1,786 | 1,505 | 2,730 | 540 | 11.0 |
| 1999–2003Current | 4,898 | 1,776 | 1,505 | 2,730 | 540 | 11.0 |
Exterior figures are manufacturer specifications for the Omega, 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.