Cycling power zones calculator
Once you know your FTP, training becomes a matter of riding in the right power zone for each workout. This calculator turns a single FTP number into the exact wattage ranges for all seven Coggan zones, the system used by coaches and platforms worldwide. No guessing — just enter your FTP and ride to the numbers.
How it works
Each zone is a fixed percentage band of FTP. The calculator multiplies your FTP by the lower and upper bound of every band:
Zone 1 Active Recovery < 55% FTP
Zone 2 Endurance 56–75% FTP
Zone 3 Tempo 76–90% FTP
Zone 4 Threshold 91–105% FTP
Zone 5 VO2max 106–120% FTP
Zone 6 Anaerobic 121–150% FTP
Zone 7 Neuromuscular > 150% FTP
For an FTP of 250 W, Threshold becomes 228–263 W and VO2max becomes 265–300 W. The watts update instantly as you change the input.
Tips and notes
Spend the bulk of your weekly volume in Zone 2 to build aerobic endurance, and use shorter, focused efforts in Zones 4 and 5 to raise your ceiling. Because the bands are percentages, re-enter a fresh FTP whenever you re-test so the zones keep pace with your fitness.
Everything runs locally in your browser — nothing is uploaded.