SADDLE HEIGHT CALCULATOR

Enter your inseam. Get a starting saddle height, then fine-tune it in millimetres.

SADDLE HEIGHT CALCULATOR

Inseam (cm)

72.4 cm

LEMOND (0.883 x inseam)

72.6 cm

ALT (0.885 x inseam)

89.4 cm

SADDLE TO BAR FLOOR REF

Measurement	Starting point	How to check it
Saddle height	72.4 cm from bottom bracket centre to saddle top, along the seat tube	Heel on the pedal at the bottom of the stroke: leg almost straight, hips level
Saddle setback	Knee roughly over the pedal axle with the crank forward and level	Drop a plumb line from the front of the kneecap
Saddle tilt	Level, or the nose 1-2 degrees down at most	Spirit level along the saddle top
Reach	Slight bend in the elbows, shoulders relaxed, back not rounded	You should be able to ride the drops for a whole zone 2 block

Measure inseam barefoot against a wall with a book pulled firmly up between your legs, floor to the top of the book.

A formula gets you into the right neighbourhood. Change one thing at a time, ride it for a week, and see a fitter or physio if anything hurts.

HOW TO MEASURE FROM

Saddle height is measured from the centre of the bottom bracket to the top of the saddle, following the line of the seat tube. Measuring to the rails, or straight up vertically, gives a different and useless number.

MEASURE YOUR INSEAM PROPERLY

Barefoot, back to a wall, feet about 15cm apart.
Pull a hardback book up between your legs, spine horizontal, firmly but comfortably.
Mark the wall at the top of the book.
Measure floor to mark. Repeat three times and use the biggest figure.

WHY 0.883?

The 0.883 multiplier comes from the well-known LeMond method and lands most riders within a few millimetres of a comfortable height. A closely related variant uses 0.885. Either way it is a starting point that gets you into the right window quickly — the final number comes from how the position feels over several rides.

Method	Formula	Notes
LeMond	inseam x 0.883, BB centre to saddle top	The most widely used starting number
Holmes / 0.885	inseam x 0.885	Marginally higher, within normal adjustment range
Heel method	Heel on pedal, leg almost straight at the bottom	Good on-bike sanity check for any formula
Knee angle	25-35 degrees of knee bend at the bottom of the stroke	What a professional fitter measures; needs video or a goniometer

ADJUST FROM THE STARTING POINT

Change 3-5mm at a time and ride three sessions before judging.
Hips rocking, toes pointing down, or pain behind the knee: too high.
Pain at the front of the knee, or feeling cramped and unable to breathe: too low.
New shoes or new cleats change your effective height. Re-check.
Mark the seatpost with tape before you move anything so you can get back.

FAQ

Do I measure to the middle or the front of the saddle?

To the top of the saddle where you actually sit, on the centre line, following the seat tube angle.

Does saddle height differ for road, gravel and indoor bikes?

The number should be the same across your bikes. Copy it from bike to bike and account for different shoe stack heights.

My calculated height feels too high. What now?

Trust your body. Drop it 5mm and build back up if you want. Tight hamstrings and limited ankle mobility both make the formula height feel excessive at first.

How much does saddle height affect power?

Less than riders think, and comfort matters more. A position you can hold for hours beats a theoretically optimal one you cannot.

KEEP READING

RIDE THE CHANGE

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