How does Natural Cycles work?
How to use Natural Cycles
Measure your temperature and add data
When you wake up, measure your temperature using your basal thermometer and add the reading into the NC° app.
Wait for the algorithm to calculate your fertility
Our algorithm uses temperature, period, and cycle data to quickly see if today is green (not fertile) or red (use protection).
Know your fertility and take control of your cycle
Your daily fertility status can be used to plan or prevent pregnancy. Plus, you’ll receive tailored insights into your own unique cycle.
How body temperature works
How our algorithm works
Natural Cycles is more than a fertility awareness method. It’s powered by a regulated and certified algorithm that learns the pattern of your unique cycle to work out each daily fertility status.
See how the algorithm works:
Your cycle starts on the first day of your period. Ovulation happens around the middle of the cycle, but this day can change depending on the pattern of your cycle.
How to use the Natural Cycles° app
Read your daily fertility status
After adding your temperature, you will get your fertility status for the day. This is either green (not fertile) or red (use protection). If trying to prevent pregnancy, you should use condoms or abstain from sex on red days.
Track PMS, pain & more
Add optional data throughout your cycle including changes to mood, sex drive, PMS and pain. Tracking symptoms can help you learn even more about your unique menstrual cycle.
Understand your cycle
Our popular graph feature helps you identify patterns in your cycle. You can also view the symptoms you have logged. Easily compare cycles or zoom out for an overview.
Adapt your fertility journey
Natural Cycles is a long-term fertility partner. Switch between NC° Birth Control, NC° Plan Pregnancy and NC° Follow Pregnancy depending on your journey.