Can I use the calculator without entering custom values for drag and weight?

The tool estimates speed or power based on cycling physics; actual performance may vary due to factors like fitness level, exact bike geometry, and riding technique that the model does not capture.

How does the calculator handle hills and wind?

The site includes a sharing feature that generates a URL containing your current parameter settings, allowing you to copy and share those exact configurations with others.

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Bike Pace Calculator

Provided byThe Computational Cyclistgribble.org

This interactive calculator models the relationship between cycling power and resulting speed. You can adjust rider, ...

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Screenshot of Bike Pace Calculator on The Computational Cyclist — gribble.orgOpen the live tool →

About this tool

What Bike Pace Calculator does

The Bike Pace Calculator on The Computational Cyclist models the physics of cycling to estimate speed from power or power from speed. It accepts inputs for rider and bike weight, frontal area, drag coefficient, drivetrain loss, hill grade, headwind speed, and rolling resistance. Users can solve for either required power at a target groundspeed or the resulting speed from a given wattage. The site provides default values for all parameters, allowing immediate use, while also offering detailed explanations of the three primary forces—gravity, rolling resistance, and aerodynamic drag—that affect performance. A graph visualizes the power-speed relationship, and users can share their parameter settings via a generated URL. Compared to basic speed-time-distance calculators, this tool incorporates terrain, wind, and riding position to deliver pacing guidance grounded in cycling physics.

Step by step

How to use the The Computational Cyclist Bike Pace Calculator

1
Select imperial or metric units at the top of the calculator
2
Enter rider and bike weight, frontal area, and drag coefficient, or accept the provided defaults
3
Adjust environmental factors such as hill grade, headwind speed, and rolling resistance
4
Input desired power (watts) or target speed (mph or kph) and the graph and results update instantly

Is it right for you

Best for

Cyclists who want to estimate speed from a known power output or determine the wattage needed to hit a specific pace, especially when factoring in hills, wind, or bike setup.

Limitations

Results depend on the accuracy of the user-entered parameters such as frontal area and drag coefficient
No automatic unit conversion between imperial and metric beyond the toggle; users must select one system
Outputs are estimates based on physical models and may vary from real-world riding conditions

Questions

Bike Pace Calculator FAQ

Can I use the calculator without entering custom values for drag and weight?: The tool estimates speed or power based on cycling physics; actual performance may vary due to factors like fitness level, exact bike geometry, and riding technique that the model does not capture.
How does the calculator handle hills and wind?: The site includes a sharing feature that generates a URL containing your current parameter settings, allowing you to copy and share those exact configurations with others.

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