Illustration showing three ways to measure with Natural Cycles: basal thermometer, Apple Watch and the Oura Ring
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3 Ways to measure with Natural Cycles

Jen on the roof terrace at Natural Cycles headquarters.

Written by Jennifer Gray

Jennifer Gray

Jennifer Gray is an award-winning writer with more than five years’ experience covering reproductive topics ranging from birth control to planning pregnancy. She is passionate about providing women with accurate information grounded in science they can use to take charge of their own health - while also dispelling myths that exist within the field of women’s health. She holds a Master of Science from the University of Edinburgh and currently lives in Ireland.

Last updated:

4 min read

The Natural Cycles certified algorithm uses body temperature to determine fertility, as there is a small, but detectable shift in temperature that happens after ovulation. Once the algorithm gets to know your unique cycle, it’s able to both confirm and predict the fertile window. For the NC° algorithm to learn your cycle you need to measure with one of our three devices. This article outlines how each device works and can help you find the right measuring option for you!

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