⚡ FTP Estimator
Functional threshold power from a 20-minute effort
About this calculator
Functional Threshold Power is the highest power you can sustain for about an hour, and it is the anchor number for all structured cycling training. The standard field test is a 20-minute all-out effort, and FTP is estimated at 95 percent of that average power. This calculator does that math and adds your watts per kilogram.
Tip: Go out slightly conservatively in your 20-minute test. A fast start that fades gives a lower average than a steady, well-paced effort.