Calculator
What does last night's HRV mean?
Pick the device that measured it first. Each one measures HRV its own way.
Your device
Sex
Yesterday
42 ms on Oura
- On Oura's own figures
- 6 ms above the middle for women on Oura (36 ms). Oura's figures from 6 million members, January to August 2026.
- For your age
- About the 47th percentile for a 35 year old woman. A rough guide from heart studies, not from your device. Healthy people vary a lot.
TodayTrain as planned
If you feel fine, one night changes nothing. Judge it against your own last few weeks on this device, and act on a slide that lasts a week or more.
Where the figures come from
The Oura and WHOOP lines use what each maker publishes for its own members. Apple publishes none, and Garmin judges you against your own band.
The age guide is a general RMSSD reference from heart studies (Umetani 1998, Nunan 2010). Apple Watch reports SDNN, so it gets no percentile.
Connect your ring or watch, and Gyroscope shows every night's HRV against your own normal, with your sleep and drinks right beside it. Open Gyroscope
