Bike Size Calculator
Find the perfect bike frame size based on your height and inseam length. This calculator provides recommendations for road, mountain, and hybrid bikes.
Published by:
isCalculator Editorial Team
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How to use this tool?
Step 1: Enter your Height (cm) and Inseam (cm). Both values must be in centimeters (metric system). Height must be between 100 and 250 cm, inseam between 50 and 120 cm.
Step 2: Select your Bike Type from the dropdown: Road, Mountain, or Hybrid.
Step 3: Click the Calculate Size button.
Step 4: Read the result: the recommended frame size is displayed in centimeters (cm). The formula used is shown below the result for your reference.
Tip: If you see an error, double-check your inputs are within the valid ranges and are numeric values.
Previous Results
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Frequently Asked Questions
The calculator multiplies your inseam length by a factor depending on bike type: 0.67 for road, 0.66 for mountain, and 0.69 for hybrid bikes. The result is the recommended frame size in centimeters.
You need your height (cm) and inseam length (cm). Inseam is measured from the floor to your crotch while standing barefoot.
This calculator is designed for adult bikes. For children, it's best to consult a sizing chart specific to kids' bikes.
