Bike Size Calculator
Find your perfect bike fit. Calculate the ideal frame size based on your height, inseam measurement, and preferred riding style for road, mountain, hybrid, or kids' bikes.
Note: This calculator provides general size recommendations. For the most accurate fit, visit a local bike shop for a professional fitting. Bike geometries can vary between brands and models.
How to Measure for Bike Sizing
Height Measurement
Stand barefoot with your back against a wall. Have someone mark the wall at the top of your head, then measure from the floor to this mark.
Inseam Measurement
Stand with your back against a wall with your feet about 6-8 inches apart. Place a book between your legs, pressing it firmly against your crotch (as if you were sitting on a bike saddle). Make sure the book is level, then measure from the top of the book to the floor.
Understanding Bike Sizing
Road Bikes
Road bikes are typically measured in centimeters from the center of the bottom bracket to the top of the seat tube. The sizing tends to be larger than mountain bikes with the same rider.
Mountain Bikes
Mountain bikes are typically measured in inches. They generally run smaller than road bikes to provide better handling on technical terrain. Standover height is especially important for mountain biking.
Hybrid & City Bikes
These bikes may be measured in either inches or centimeters depending on the manufacturer. They typically have a more relaxed geometry than road bikes for comfort.
Kids Bikes
Kids bikes are primarily sized by wheel diameter rather than frame size. The most important factor is that the child can stand over the bike with both feet flat on the ground.