Bike Gear Calculator

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Analyzes gear ratios on a bicycle based on chainrings and cassette cogs.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Front Chainring Teeth, Rear Cog Teeth, Wheel Diameter, and Cadence (RPM) in the units shown.

Step 2

Read Wheel Circumference, Gear Ratio, Inches per Pedal Revolution, and Speed (MPH) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Front Chainring Teeth: 52 teeth; Rear Cog Teeth: 11 teeth; Wheel Diameter: 27 inches; Cadence (RPM): 90 RPM

Wheel Circumference: 84.82293; Gear Ratio: 4.727272727; Inches per Pedal Revolution: 400.9811236; Speed (MPH): 34.17452758

Front Chainring Teeth: 39 teeth; Rear Cog Teeth: 17 teeth; Wheel Diameter: 27 inches; Cadence (RPM): 80 RPM

Wheel Circumference: 84.82293; Gear Ratio: 2.294117647; Inches per Pedal Revolution: 194.5937806; Speed (MPH): 14.74195307

Front Chainring Teeth: 30 teeth; Rear Cog Teeth: 32 teeth; Wheel Diameter: 27 inches; Cadence (RPM): 70 RPM

Wheel Circumference: 84.82293; Gear Ratio: 0.9375; Inches per Pedal Revolution: 79.52149688; Speed (MPH): 5.271311346

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