The dimensions of a Brompton when folded are 585mm high x 565mm long x 270mm wide (23" x 22.2" x 10.6").

Measurements are based on a bike with folding pedal and a standard seatpost and saddle; however, measurements will vary slightly by model. For instance, a model without mudguards will reduce the height of the folded package and the extended seatpost will increase the height by 60mm.

The volumetric size of the folded package is approximately 3.1ft3 (0.089m3).