The current Audi A4 is 4,762 mm long, 1,847 mm wide and 1,457 mm tall, on a 2,820 mm wheelbase. It has grown 28 cm longer since the 1996 A4.
| Years | Length | Width | Height | Wheelbase | Boot capacity | Turning circle |
|---|---|---|---|---|---|---|
| 1996–2001 | 4,479 | 1,733 | 1,417 | 2,616 | 390 | 11.1 |
| 1997–1999 | 4,488 | 1,733 | 1,396 | 2,607 | 390 | 11.4 |
| 2000–2001 | 4,525 | 1,799 | 1,386 | 2,607 | 390 | 11.4 |
| 2001–2004 | 4,547 | 1,767 | 1,428 | 2,650 | 442 | 11.1 |
| 2003–2008 | 4,575 | 1,781 | 1,440 | 2,651 | 442 | 11.5 |
| 2008–2011 | 4,703 | 1,826 | 1,436 | 2,808 | 490 | 11.4 |
| 2009–2011 | 4,720 | 1,837 | 1,475 | 2,807 | 490 | 11.4 |
| 2011–2016 | 4,699 | 1,826 | 1,415 | 2,808 | 490 | 11.4 |
| 2015–2019 | 4,725 | 1,842 | 1,434 | 2,820 | 505 | 11.6 |
| 2016–2019 | 4,749 | 1,842 | 1,483 | 2,819 | 505 | 11.6 |
| 2017–2018 | 4,781 | 1,866 | 1,404 | 2,826 | 505 | 11.7 |
| 2019–2024Current | 4,762 | 1,847 | 1,457 | 2,820 | 494 | 11.6 |
Exterior figures are manufacturer specifications for the A4, 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.