← All assessments
Heart rate variability
rMSSD compared with age and sex distributions by measurement context.
rMSSD in milliseconds, as reported by most wearables and chest straps. Overnight and morning readings are not interchangeable, so record which one you used.
Reference distributions are published separately for each sex.
Fill in the fields above and your result appears here instantly. Nothing is sent anywhere — the whole calculation runs in your browser.
This tool provides general wellness information by comparing self-reported measurements with published population data. It does not diagnose, treat or predict any disease, and it is not a substitute for advice from a qualified clinician.