How accurate are these estimates?

These are typical ratios for trained cyclists. Individual variation is significant — sprinters will have higher short-duration power relative to FTP, while time triallists may sustain higher fractions of FTP for longer.

What is the power-duration curve?

The power-duration curve shows the maximum power you can sustain for any given duration. Power decreases as duration increases, following a hyperbolic relationship.

Why does it use FTP as the basis?

FTP (Functional Threshold Power) is the most commonly tested metric and provides a good anchor point for estimating power at other durations.

How can I get more accurate values?

Perform dedicated maximal efforts at each duration (5s, 1min, 5min, 20min, 60min) and record the data with a power meter.

BikeCalcs

Power Duration Calculator — Sustainable Power Estimates

Estimate sustainable power output for different durations.

FTP

Body Weight

How We Calculate This

Power-Duration Estimation

This calculator uses typical power-duration ratios relative to FTP:

5-second (neuromuscular): ~250% of FTP
1-minute (anaerobic): ~170% of FTP
5-minute (VO2 max): ~120% of FTP
20-minute: ~105% of FTP
60-minute: ~95% of FTP
2-hour: ~85% of FTP

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify results and consult a professional bike fitter where appropriate.