Can I use this calculator with tire sizes listed in inches?

Yes, but you must first convert the inch marking to the ISO 5775 standard used by the pickers; the site provides an article explaining how to do this conversion.

Does the tool account for wind or hills when calculating speed?

No, the calculator only factors in cadence, gear ratio, rim diameter, and tire thickness; it does not include wind resistance, grade, or rider power output.

What measurement system should I select for kilometers per hour?

Select the metric value in the measurement system picker to convert the output speed to kilometers per hour; selecting imperial converts to miles per hour instead.

Is the speed calculation affected by the number of teeth on my chainring or cog?

Yes, the front chainring teeth and rear sprocket teeth directly determine the gear ratio, which the tool uses to translate your cadence into forward speed.

SportsTool Review

Bike Speed Calculator

Provided byBikeCalcbikecalc.com

BikeCalc’s speed tool estimates cycling speed from cadence, chainring/cog setup, and wheel/tire dimensions. It suppor...

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About this tool

What Bike Speed Calculator does

BikeCalc’s speed calculator determines cycling speed from a rider’s cadence and drivetrain setup. By entering the number of teeth on the front chainrings and rear sprockets, along with rim diameter and tire thickness, the tool outputs a speed in either kilometers per hour or miles per hour depending on the selected measurement system. The interface presents pickers for each variable, allowing cyclists to model how gear ratios and tire dimensions affect their forward motion without needing to perform manual gear-inches calculations.

Step by step

How to use the BikeCalc Bike Speed Calculator

1
Count the teeth on your front chainring and select that value in the chainrings teeth picker
2
Count the teeth on your rear cog and select that value in the sprockets teeth picker
3
Measure your rear tire thickness in millimeters and choose it in the tire thickness picker
4
Enter your rim diameter in millimeters using the rim diameter picker
5
Drag the cadence slider to your current pedaling rate and read the resulting speed

Is it right for you

Best for

Cyclists who want a quick, unit-converting speed estimate based on their actual bike geometry and cadence, without installing software or performing manual gear-inches math.

Limitations

Results depend on accurate manual measurements of tire thickness and rim diameter
No built-in wind, slope, or drivetrain efficiency adjustments
Speed output assumes a flat, windless surface

Questions

Bike Speed Calculator FAQ

Can I use this calculator with tire sizes listed in inches?: Yes, but you must first convert the inch marking to the ISO 5775 standard used by the pickers; the site provides an article explaining how to do this conversion.
Does the tool account for wind or hills when calculating speed?: No, the calculator only factors in cadence, gear ratio, rim diameter, and tire thickness; it does not include wind resistance, grade, or rider power output.
What measurement system should I select for kilometers per hour?: Select the metric value in the measurement system picker to convert the output speed to kilometers per hour; selecting imperial converts to miles per hour instead.
Is the speed calculation affected by the number of teeth on my chainring or cog?: Yes, the front chainring teeth and rear sprocket teeth directly determine the gear ratio, which the tool uses to translate your cadence into forward speed.

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