The current Mazda 323 is 4,251 mm long, 1,705 mm wide and 1,420 mm tall, on a 2,610 mm wheelbase. It has grown 38 cm longer since the 1979 323.
| Years | Length | Width | Height | Wheelbase | Boot capacity | Turning circle |
|---|---|---|---|---|---|---|
| 1979–1980 | 3,876 | 1,604 | 1,375 | 2,315 | 461 | 8.8 |
| 1980–1985 | 3,955 | 1,630 | 1,375 | 2,365 | 454 | 9.2 |
| 1985–1989 | 3,990 | 1,645 | 1,390 | 2,400 | 315 | 9.4 |
| 1986–1987 | 4,225 | 1,645 | 1,430 | 2,400 | — | 9.4 |
| 1989–1995 | 4,071 | 1,675 | 1,366 | 2,463 | 317 | 9.6 |
| 1994–1997 | 4,127 | 1,695 | 1,382 | 2,551 | 321 | 9.8 |
| 1997–1998 | 4,123 | 1,695 | 1,384 | 2,548 | 323 | 9.8 |
| 1998–2001 | 4,161 | 1,703 | 1,416 | 2,585 | 344 | 10.4 |
| 2001–2003Current | 4,251 | 1,705 | 1,420 | 2,610 | 356 | 10.6 |
Exterior figures are manufacturer specifications for the 323, 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.