The current Hyundai i30 is 4,340 mm long, 1,795 mm wide and 1,455 mm tall, on a 2,650 mm wheelbase. It has grown 10 cm longer since the 2007 i30.
| Years | Length | Width | Height | Wheelbase | Boot capacity | Turning circle |
|---|---|---|---|---|---|---|
| 2007–2010 | 4,245 | 1,775 | 1,470 | 2,650 | 340 | 10.2 |
| 2010–2012 | 4,280 | 1,775 | 1,480 | 2,650 | 340 | 10.2 |
| 2012–2017 | 4,300 | 1,780 | — | 2,650 | 378 | 10.6 |
| 2017–2020 | 4,339 | 1,795 | 1,450 | 2,650 | 394 | 10.6 |
| 2018–2020 | 4,455 | 1,795 | 1,424 | 2,650 | 450 | 10.6 |
| 2020–2024 | 4,384 | 1,795 | 1,443 | 2,650 | 416 | 10.6 |
| 2024–presentCurrent | 4,340 | 1,795 | 1,455 | 2,650 | 395 | 10.6 |
Exterior figures are manufacturer specifications for the i30, 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.