A good HRV is best understood as a personal benchmark rather than a universal target. Heart rate variability, or HRV, is the variation in time between consecutive heartbeats, and it reflects how your autonomic nervous system balances its stress and recovery signals. Because that balance is shaped by age, fitness, sleep, and genetics, two healthy people can have very different numbers and both be normal. Still, people reasonably want to know where they stand, so this guide gives real by-age reference charts and then explains how to read your own value against them. Different Health integrates HRV from wearables like Whoop and Oura into its dashboard alongside lab-based measures, so this is the same lens its team uses when reading the metric.
What HRV actually measures
Your heart does not beat like a metronome. Even at a steady rate, the gap between one beat and the next constantly changes by small amounts, and HRV captures that fluctuation. Those changes come from the autonomic nervous system, which has two branches: the sympathetic branch that speeds things up under stress, and the parasympathetic branch that promotes rest and recovery. Higher HRV generally reflects a stronger, more flexible parasympathetic response.
Most wearables estimate HRV using a metric called RMSSD, which tracks beat-to-beat differences and is closely tied to that recovery branch. The charts below use RMSSD for exactly that reason: it is the number you are most likely to see on your own device.
Normal HRV by age chart
The values below come from the Lifelines cohort, a study of more than 150,000 people, which makes it one of the largest HRV reference datasets available. Because RMSSD is skewed, with a long tail of high values pulling the average up, the median is the more representative figure for a typical person, so it is shown first, with the mean alongside.
| Age | Median RMSSD (ms) | Mean RMSSD (ms) |
|---|---|---|
| 13–14 | 66.5 | 77.7 |
| 15–19 | 60.7 | 73.8 |
| 20–24 | 52.1 | 64.7 |
| 25–29 | 47.5 | 58.0 |
| 30–34 | 42.3 | 51.6 |
| 35–39 | 37.9 | 46.0 |
| 40–44 | 33.9 | 41.0 |
| 45–49 | 29.2 | 35.6 |
| 50–54 | 26.6 | 31.8 |
| 55–59 | 22.5 | 27.2 |
| 60–64 | 20.5 | 25.2 |
| 65–69 | 17.8 | 22.9 |
| 70–74 | 18.3 | 25.2 |
| 75+ | 16.1 | 24.0 |
Normal HRV (RMSSD, in milliseconds) by age for women. Median is the typical value; mean runs higher. Source: Lifelines cohort, Tegegne et al., 2020.
| Age | Median RMSSD (ms) | Mean RMSSD (ms) |
|---|---|---|
| 13–14 | 67.4 | 80.3 |
| 15–19 | 59.9 | 70.8 |
| 20–24 | 47.6 | 57.3 |
| 25–29 | 42.3 | 52.1 |
| 30–34 | 36.9 | 45.4 |
| 35–39 | 32.8 | 39.9 |
| 40–44 | 29.0 | 35.2 |
| 45–49 | 26.0 | 31.6 |
| 50–54 | 23.7 | 28.7 |
| 55–59 | 21.0 | 26.2 |
| 60–64 | 19.1 | 24.8 |
| 65–69 | 17.7 | 24.4 |
| 70–74 | 16.0 | 27.2 |
| 75+ | 14.9 | 25.4 |
Normal HRV (RMSSD, in milliseconds) by age for men. Median is the typical value; mean runs higher. Source: Lifelines cohort, Tegegne et al., 2020.
The clearest pattern is the steady decline with age: median RMSSD roughly halves between the twenties and the sixties in both sexes. The reversal you may notice in the oldest bands, where the mean ticks back up, reflects the small numbers and wide spread of HRV in older adults rather than a real rise, which is one more reason to lean on the median and on your own trend.
In more than 150,000 people, median RMSSD fell from around 60 ms in the late teens to under 20 ms past age 60 — the same number can be excellent at one age and low at another.
— Lifelines cohort, Tegegne et al., 2020
So what counts as a good HRV?
With the age context in place, a good HRV is simply one that sits at or above the median for your age and sex, and ideally trends upward over time. Using the charts above, a 40-year-old man around 29 ms is right at the typical value, while the same 29 ms would be below average for a man in his twenties and clearly above average for one in his sixties. That is the whole point: the number only means something once you anchor it to your age.
Two honest caveats keep this from becoming a rigid scorecard. There are no official normative HRV cutoffs, so these charts orient rather than diagnose. And fitness shifts the picture: a well-trained endurance athlete often sits well above their age median, while the same person after a bad night or a hard training block can dip below it for a day without anything being wrong.
Why your wearable's number differs
If your Whoop, Oura, or Apple Watch shows a number that does not match the chart, that is expected. These devices report RMSSD but measure at different times, over different windows, and with different algorithms, so their values are not directly comparable to each other or to a research dataset measured under controlled conditions.
The practical rule is to treat the by-age charts as orientation, not a target to hit on your specific device. What your wearable is genuinely good at is tracking you against yourself over time, which is the comparison that actually matters.
Why your own baseline matters most
Because the healthy range is so wide and so personal, the most informative approach is to establish your own baseline and watch how it moves. A single low reading usually reflects something temporary, like a late night or a hard session. A sustained drop over one to two weeks is the more meaningful signal.
| Step | What to do | Why it helps |
|---|---|---|
| Measure consistently | Same device, same time, ideally overnight or on waking | Removes noise from time of day and posture |
| Collect a baseline | Track for two to four weeks before judging anything | Establishes your normal range |
| Watch the trend | Follow a rolling weekly average, not single days | Filters out one-off spikes and dips |
| Link it to inputs | Note sleep, alcohol, training, and stress alongside it | Turns the trend into something you can act on |
A simple way to establish and read your HRV baseline
Read this way, HRV becomes a feedback tool for recovery rather than a score to compare with friends. If your baseline drifts down and stays there despite good habits, that is worth raising with a clinician, since persistently low HRV has been associated with cardiovascular and metabolic risk in research. This is educational information, not a substitute for personal medical advice.
Reading HRV in context
HRV is powerful precisely because it reflects many systems at once, but that also means it says little in isolation. A number that looks low makes more sense once you know a person's aerobic fitness, cardiovascular markers, sleep, and stress load. Interpreting it well means placing it next to those other measures.
This is how Different Health approaches it. Rather than treating a wearable number as the whole story, its assessment measures fitness and cardiovascular health directly and looks at stress and recovery, then pulls your wearable HRV into the same dashboard so its MDs and PhDs can interpret the trend against your actual physiology and build it into a personalized plan.
Key takeaways
- No universal number: a good HRV is personal, and healthy values span a wide range.
- It's age-dependent: median RMSSD roughly halves from the twenties to the sixties, so compare within your age band.
- Good means at or above your age median: and, better still, trending upward over time.
- RMSSD is the wearable metric: but devices measure differently, so use the charts as orientation, not a target.
- Track the trend: your own baseline over weeks is far more useful than any single reading.
- Context is key: HRV means the most read alongside fitness, cardiovascular health, and sleep.
Frequently asked questions
What is a good HRV?
There is no single good HRV that applies to everyone, because it varies widely by age, sex, fitness, and how it is measured. As a rough orientation using RMSSD, the metric most wearables report, a typical median value runs around 47 to 52 ms in your late twenties and falls to the low 20s by your sixties. A higher value than others your age generally reflects better recovery, but the most useful benchmark is your own baseline over time rather than anyone else's number.
What is a normal HRV by age?
HRV declines steadily with age. In a large cohort study, median RMSSD fell from roughly 60 ms in the late teens to the high teens and low 20s past age 60, with a similar pattern in men and women. So a normal HRV for a 25-year-old is much higher than a normal HRV for a 60-year-old. Because values also depend on your device and measurement conditions, compare yourself to your own age band and, more importantly, to your own trend.
Is a HRV of 30 good?
It depends heavily on your age. Using median RMSSD from a large cohort, 30 ms is around the middle of the range for someone in their forties, above average past age 55, and below the median for someone in their twenties. This is why the same number can be reassuring at one age and worth a closer look at another. Your own baseline and trend matter more than a single cutoff.
Does HRV decrease with age?
Yes. HRV falls across the adult lifespan as the nervous system becomes less variable, and the decline is one of the most consistent findings in the research. In cohort data, median RMSSD roughly halves between the twenties and the sixties. Regular aerobic fitness slows this trend and keeps values higher for a given age, which is part of why HRV is used as a marker of recovery and cardiovascular health.
What is a good HRV for my wearable?
Whoop, Oura, and Apple Watch mostly report RMSSD, but they measure at different times and over different windows, so their numbers are not directly comparable to each other or to a research chart. Use the by-age values here as a rough orientation, then rely on your own device's baseline. A value that is normal and stable for you on your device matters more than matching a population figure.
How can I improve my HRV?
The habits that raise HRV are regular aerobic exercise, consistent and sufficient sleep, stress management such as slow breathing, limiting alcohol, and staying hydrated. Improvements show up gradually and are best judged against your own baseline over weeks, not day to day. Because HRV reflects many systems at once, pairing it with other measures of fitness and recovery gives a clearer picture than the number alone.
References
- Tegegne BS, Man T, van Roon AM, et al. "Reference values of heart rate variability from 10-second resting electrocardiograms: the Lifelines Cohort Study." European Journal of Preventive Cardiology. 2020;27(19):2191–2194. (Table 1: RMSSD reference values per age bin for women and men; n > 150,000.)
- Nunan D, Sandercock GRH, Brodie DA. "A Quantitative Systematic Review of Normal Values for Short-Term Heart Rate Variability in Healthy Adults." Pacing and Clinical Electrophysiology. 2010;33(11):1407–1417.
- Shaffer F, Ginsberg JP. "An Overview of Heart Rate Variability Metrics and Norms." Frontiers in Public Health. 2017;5:258.