Free health tool

HRV Interpreter

Enter your average HRV from your wearable. Get a plain-language explanation of what it may mean — including where you sit relative to normal ranges for your age, and what the recovery and stress signal suggests.

HRV varies widely between individuals. This tool uses published population reference ranges. It is not a medical assessment and does not diagnose any condition. Consult a healthcare professional with any concerns.

The 7- or 30-day average from your wearable (Garmin, Apple Watch, Oura, WHOOP, etc.). Usually shown in milliseconds (ms) in your app's recovery or readiness section.

55 ms

HRV naturally declines with age — selecting your age group ensures the comparison is accurate.

Biological sex has a modest effect on HRV reference ranges — women tend to have slightly lower average HRV than men at the same age.

Understanding HRV

What is HRV?

Heart rate variability (HRV) measures the variation in time between consecutive heartbeats. A higher HRV generally indicates your autonomic nervous system is well-balanced — the body can shift flexibly between sympathetic (stress/exertion) and parasympathetic (recovery/rest) states. Lower HRV often signals the body is under stress, under-recovered, or fatigued.

Why does HRV decline with age?

Autonomic nervous system function naturally changes as we age — the parasympathetic branch becomes less dominant, which reduces HRV on average. This is normal and expected. Because of this age-based decline, your HRV should only be compared to others in a similar age range, not to young athletes or population averages that ignore age.

What causes short-term HRV drops?

Acute drops in HRV (compared to your personal baseline) are often linked to: alcohol consumption, illness or infection, heavy training loads without adequate recovery, poor sleep, high psychological stress, and heat exposure. Single-day readings matter less than trends. A one-day low HRV is rarely a concern; sustained low HRV for several days often signals genuine stress or recovery debt.

Is a higher HRV always better?

Within your personal range, higher is generally better. But population comparisons can be misleading — someone with an HRV of 30ms who is above average for their age group may be in better recovery shape than someone with 80ms who is below their own typical baseline. Your trend matters more than the absolute number.

Is this medical advice?

No. This tool uses published population reference data for educational context only. It does not diagnose, treat, or monitor any medical condition. If you have concerns about your heart rate or cardiovascular health, speak with a qualified healthcare professional.