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Both calculators run independently — change the inputs on either side to compare results.

Cycling Power Duration Curve Calculator

Estimate the maximum sustainable power you can hold for any duration from a 1-minute sprint to a multi-hour ride, using your FTP and anaerobic capacity. Ideal for race pacing and structured training planning.

Functional Threshold Power (FTP) (watts)

Anaerobic Work Capacity (joules)

Target Duration

Current Fatigue Level

Fill in the required fields to see your result.

Cycling

Cycling Heart Rate Zones Calculator

Calculate your cycling heart rate training zones from your maximum heart rate. Use these zones to structure workouts for endurance, tempo, threshold, and high-intensity efforts.

Maximum Heart Rate (BPM)

Training Zone

Fill in the required fields to see your result.

Key differences

	Cycling Power Duration Curve Calculator	Cycling Heart Rate Zones Calculator
Category	Cycling	Cycling
Inputs required	4	2
Result	Sustainable Power (watts)	Target Heart Rate (BPM)
What it does	Estimate the maximum sustainable power you can hold for any duration from a 1-minute sprint to a multi-hour ride, using your FTP and anaerobic capacity. Ideal for race pacing and structured training planning.	Calculate your cycling heart rate training zones from your maximum heart rate. Use these zones to structure workouts for endurance, tempo, threshold, and high-intensity efforts.