Critical Power

Calculator

Determining Your Critical Power (CP) and W’.

To accurately assess your Critical Power (CP) and W’, perform two to three maximal efforts lasting between 3 and 20 minutes. For best results, we recommend efforts of 3 minutes, 5–6 minutes, and 12 minutes.

Test Guidelines:

• Maintain a consistent power output throughout each effort.

• Avoid starting too aggressively or finishing with an unnecessary sprint.

• Focus on even pacing to ensure reliable data.

Recording Your Data:

1. Complete each test at maximal effort.

2. Calculate the average power for each effort.

3. Enter your test data into the calculator below, ensuring that the duration is input in seconds (not minutes).

Critical Power Calculator

Test 1 Duration (s)

Test 1 Power (W)

Test 2 Duration (s)

Test 2 Power (W)

Test 3 Duration (s)

Test 3 Power (W)

Results - Two Test Solution

Critical Power: - W

Approximate FTP: - W

W' (kJ): -

Results - Three Test Solution

Critical Power: - W

Approximate FTP: - W

W' (kJ): -

Goodness of Fit (%): -