HRV Calculator
See if your heart rate variability is good for your age
Enter your reading
For reference only, not a medical diagnosis. If you feel unwell or your reading is concerning, contact a healthcare professional.
About this reading
Wearables and oximeters give a snapshot; a single reading varies with rest, temperature and movement. Trends over time matter more than one number.
- Measure at rest, warm and still, for the most reliable reading.
- One unusual reading is rarely an emergency, but repeated abnormal values with symptoms should be checked by a doctor.
About this tool
What is HRV Calculator?
Compares your HRV (RMSSD) against a typical range for your age band.
What is it for?
Understand the HRV number from your watch and whether it signals good recovery.
How to read your result
HRV falls with age and varies a lot between people; higher within your age band usually reflects better recovery.
For reference only, not a medical diagnosis. See a healthcare professional for concerns.
Frequently asked questions
What is a good HRV?
There is no single good number — HRV is very individual and drops with age. A value in or above the typical range for your age band is a good sign.
What is a normal HRV by age?
Rough typical RMSSD: under 30 ≈ 40–100 ms, 30s ≈ 35–90, 40s ≈ 30–80, 50s ≈ 25–70, 60+ ≈ 20–60 ms.