Saddle Height Calculator — Optimal Seat Position

The Hamley method (inseam × 1.09) is the most common and measures from the pedal axle (crank at 6 o’clock) to the saddle top. The LeMond method (inseam × 0.883) measures from the bottom-bracket centre to the saddle top. The two raw figures are NOT directly comparable — for an 84 cm inseam Hamley gives 916 mm and LeMond gives 742 mm, because they start from different reference points. They only agree once you account for crank length and pedal/cleat stack (typically ~165–175 mm). Pick one reference, set it up, then fine-tune with the Holmes knee-angle check.

Saddle height is measured from the centre of the bottom bracket axle to the top of the saddle, along the seat tube. Some methods measure from the pedal axle at its lowest point.

A saddle that is too high causes rocking hips, knee pain (back of knee), numbness, and reduced power. It is a common cause of injury.

A saddle that is too low causes knee pain (front of knee), reduced power output, and inefficient pedalling. It puts excessive strain on the quadriceps.