Bicycle Speed Calculator
Pick what to solve on the left and enter distance, time or speed with optional gearing and conditions; the right pane updates average speed, pace, calories, estimated power, and grade, wind and surface adjusted speeds right away.
Input
Gearing & cadence
Conditions
Weight
Enter values and the result updates automatically.
Result
- Elapsed time
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- Distance
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- Est. calories
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- Est. power
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Gearing & cadence
- Gear ratio
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- Gear inches
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- Development
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- Cadence speed
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- Distance / hour
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Grade, wind & surface
- Grade-adjusted
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- Wind-adjusted
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- Surface-adjusted
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- Final adjusted speed
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The grade, wind and surface factors and the estimated power and calories are rough assumptions; real numbers depend on fitness, position, equipment and road conditions.
ready to use.
- Visible firstKeep the input and result positions clear.
- Results firstPut the main number up front and keep the process secondary.
- Less to askNo sign-up or extra information before using the tool.
How to read bicycle speed as numbers
A bicycle speed calculation starts with average speed — how far you rode in how much time — then adds the theoretical speed from your gearing and cadence, and finally the speed after grade, wind and surface adjustments, all on one screen.
The English page is a US scenario: miles, miles per hour and pounds. The grade, wind and surface factors and the estimated power and calories are rough reference figures; your real numbers depend on fitness, position, equipment and road conditions.
Average speed only needs distance and time
Average-speed mode divides distance by time to get miles per hour. Hours, minutes and seconds are all converted to hours, so 1 h 30 min becomes 1.5 hours. Pick what to solve on the left and only the inputs you need stay on screen.
- Average speed = distance ÷ time
- Elapsed time = distance ÷ speed
- Distance = speed × time
Gearing and cadence give a theoretical speed
Chainring teeth divided by sprocket teeth is the gear ratio; multiply by wheel circumference for development (the meters you roll per pedal stroke). Multiply by cadence for a theoretical cadence speed. It ignores air and rolling resistance, so real speed is lower.
- Gear ratio = chainring ÷ sprocket
- Development (m) = ratio × wheel ÷ 1000
- Cadence speed = cadence × development × 60 ÷ 1000
Grade, wind and surface stack as multipliers
The base speed is multiplied by a grade factor, a wind factor and a surface factor in turn to get the final adjusted speed. Climbs, headwinds and rough surfaces lower it; descents, tailwinds and smooth pavement raise it.
- Grade-adjusted = base × grade factor
- Wind-adjusted = grade-adjusted × wind factor
- Surface-adjusted = wind-adjusted × surface factor
Estimated power and calories are references
Estimated power adds air, rolling and grade resistance from rider and bike weight, speed, grade, wind and surface, then divides by drivetrain efficiency. Calories multiply a speed-based MET value by weight and ride time. Both need rider weight in pounds.
US example
Riding 30 miles in 2 hours is an average of 15 mph. Add a 155 lb rider weight to see rough calories and estimated power. A 50T front, 12T rear and 90 rpm cadence shows a gear ratio near 4.17:1 with its cadence speed in mph.
- Input
- 30 mi · 2 h · 155 lb
- Average speed
- 15.00 mph · pace 8:00 /mi
- Gear sample
- 50T / 12T / 90 rpm → cadence speed
Input ranges and display
Grade is limited to -25% to 25%, wind to 0–80 mph, weight to about 44–440 lb and cadence to 30–200 rpm. Speed and distance show two decimals and gear inches one, so long or fast rides can carry small rounding differences.
Bicycle speed FAQ
How is average speed calculated?
Average-speed mode divides distance by time to get miles per hour. Hours, minutes and seconds are converted to hours, and with only distance and time you get a result without any gearing or condition inputs.
What is the speed from gearing and cadence?
Chainring teeth divided by sprocket teeth is the gear ratio; multiplied by wheel circumference it gives development (meters per pedal stroke). Multiplied by cadence it becomes a theoretical cadence speed that ignores real road resistance.
How are grade, wind and surface applied?
The base speed is multiplied by a grade factor, a wind factor and a surface factor in turn for the final adjusted speed. Climbs, headwinds and rough surfaces lower it and descents or tailwinds raise it; the factors are general assumptions.
Can I trust the estimated power (W)?
Estimated power adds air, rolling and grade resistance from rider and bike weight, speed, grade, wind and surface, then divides by drivetrain efficiency. It is a reference figure, not a power-meter reading, and needs rider weight to show.
How are calories estimated?
A speed-based MET value is multiplied by weight and ride time to estimate calories burned. Individual heart rate, muscle mass and efficiency change the real figure, so treat it as a reference.
Reference date: 2026-07-13. The adjustment factors and the estimated power and calories are rough reference figures.