"What is a good HRV" is one of the most-searched health questions of the wearable era, and it has a frustrating but honest answer: there is no universally good number. Here are the real ranges, why they mislead people, and the comparison that actually works.
Typical HRV values (Apple Watch, SDNN)
Apple Watch reports HRV using SDNN, measured in milliseconds. Across large samples of Apple Watch users, most healthy adults fall roughly in the 20–75 ms range, with an overall average in the mid-30s to low-40s. As a rough sketch by age:
| Age | Typical SDNN range |
|---|---|
| 20–29 | ~55–105 ms |
| 30–39 | ~45–90 ms |
| 40–49 | ~35–75 ms |
| 50–59 | ~30–60 ms |
| 60+ | ~25–50 ms |
Treat these as loose orientation, not targets. HRV declines naturally with age, runs somewhat lower in women than men on average, and varies enormously between healthy individuals — genetics alone produce several-fold differences between people with identical health.
Why population ranges mislead you
Three reasons:
- Between-person variation is huge. A perfectly healthy 35-year-old can live at 25 ms while another lives at 95 ms. Neither number predicts anything about the other person.
- Measurement context dominates. Overnight readings, morning readings, and random afternoon samples produce very different values. Apple Watch mixes them.
- Different metrics, different scales. Apple uses SDNN; Whoop and Oura emphasize rMSSD. The numbers aren't comparable, so a "good HRV" chart built on one metric misleads users of another.
The comparison that works: you vs. your baseline
Every serious application of HRV — in sports science, in research, in clinical monitoring — works the same way: establish an individual's normal range over weeks, then interpret deviations from it. A drop of 15–20% below your own rolling baseline for several consecutive days is meaningful. Being 15 ms below a stranger on Reddit is not.
So the practical definition of a "good HRV" is: at or above your own recent baseline. That means your nervous system has capacity to spare. Below baseline for days at a time means load is accumulating — from stress, sleep debt, illness, alcohol, or training — and it's worth responding. Our guide on why HRV drops covers the causes in detail.
What a rising baseline means
Over months, a slowly rising baseline generally reflects improving cardiovascular fitness, better sleep, lower chronic stress, or reduced alcohol intake — the levers covered in how to improve your HRV. It's one of the most encouraging trends you can see in your own data.
Where mood fits in
Here's the part almost every HRV chart leaves out: the reason HRV matters day-to-day isn't cardiac — it's emotional. HRV reflects the same autonomic balance that shapes whether you feel calm, stressed, energized, or flat. Tracking your baseline alongside your mood turns an abstract number into a personal early-warning system, which is the entire premise of HRV-based mood tracking.
Put this into practice with MoodQuad
MoodQuad establishes your personal HRV baseline automatically from Apple Health, then shows you what deviations from it mean for your mood — the comparison that's actually worth making. Free to start.
Medical disclaimer: This article and the MoodQuad app are for education and self-reflection only. They do not provide medical advice, diagnosis, or treatment. HRV and heart rate data from consumer wearables are not diagnostic. If you have concerns about your heart or mental health, talk to a qualified clinician. If you are in crisis in the US, call or text 988.