Create a free account to run the calculator
The free calculator gives you your Critical Power and W′ in seconds. We just ask for an email so you get a copy of your results and we know who's training with us.
What you get for free
- ✓Your Critical Power (CP) and W′ calculated from 3 erg tests
- ✓Plain English interpretation of what your numbers mean
- ✓No credit card required, no trial period
Upgrade any time for full training zones, personalised sessions, and your individual report. See our Privacy Policy for how we handle your data.