Trunk comparison: Audi Q3 vs BMW i4

Key Differences

There are several noticeable differences in cargo volume: The height of the trunk opening is 4.3 in (16%) larger in the Audi Q3 than in the BMW i4, the width of the trunk at its narrowest point in the Audi Q3 is 4.7 in (14%) greater, and the width of the trunk opening is even 7.1 in (19%) wider.

The BMW i4 offers a slightly greater depth of the cargo area (loading edge to trunk floor) — 0.4 in (11%) more than the Audi Q3. Smaller differences, such as the BMW's 3.9 in (6%) longer total cargo area with folded seats or the 3.1 in (9%) longer loading depth with the first row upright, are more secondary and not highlighted.

Impact on Usability

The greater widths (especially at the opening) and the higher opening of the Audi Q3 make it more practical for transporting wider or bulkier items: furniture parts, strollers, or wider boxes can be loaded and unloaded more easily because less tilting and angling is required.

The wider opening is also a clear advantage in tight garages or when maneuvering sideways.

The slightly larger cargo floor of the BMW i4 (the 0.4 in greater depth) can favor storing flat but longer items and ensures better utilization of the low cargo area — practical when bulky parts need to lie low. However, the absolute difference is very small, so the practical gain may be limited.

Other, non-highlighted differences affect handling: The Audi has a loading edge that is 2 in higher (making loading easier in the BMW), and the BMW offers a slightly longer overall storage space with folded seats (a moderate advantage for very long luggage).

Overall: the Audi Q3 is the better choice for wide, bulky, or tall cargo; the BMW i4 offers small advantages in interior depth utilization and somewhat longer, cleanly usable storage space with folded seats.