Bike Calculator

Predict speed from power - fully numeric inputs

The calculators on this page do velocity prediction. You enter your power in watts and they tell you how fast you'll go. There are two independent calculators here so you can compare two sets of input parameters.

This version allows you to enter numeric values for rolling resistance, frontal area and shape factor (Cv).

The initial values of rolling resistance correspond to the "Clincher" choice in the menu-driven calculators. The frontal area and Cv values correspond roughly to the "Hoods" choice. Obtaining an actual Cv value requires a wind tunnel or a very clever experimentalist.

See the links at right for other calculators.

Grade is distance traveled divided by rise; enter a negative number for descents. You can enter a negative number for tailwinds. Calories and weight loss are based on the effort expended; basal metabolism is not included.

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SPEED from Power, Metric units
SPEED from Power, US units

SPEED from Power, all numeric,

POWER from Speed, Metric units
POWER from Speed, US units

Six segments, Power-Metric
Six segments, Power-US

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