Heart Rate Variability Calculator

Estimate HRV status from RMSSD and age — see RMSSD, category and recovery readiness.

Heart Rate Variability Calculator

Estimate HRV status from RMSSD and age — see RMSSD, category and recovery readiness.

RMSSD (ms)

Age

Enter values above and click Calculate — results will appear here with the formula explained.

Category by age-adjusted RMSSD: 20-30y >60 high, 50-60 moderate, <30 low; decreases ~5ms per decade

How does this work?

HRV RMSSD reflects parasympathetic activity. Higher is generally better recovery and fitness, but varies by age, fitness and stress. This gives age-adjusted category.

Track trend, not single value. Morning HRV drop 10-20% suggests fatigue. This is wellness, not medical diagnosis.

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Disclaimer: Results are estimates for informational purposes only and do not constitute professional medical advice.

Quick Answer

Heart Rate Variability Calculator: Estimate HRV status from RMSSD and age — see RMSSD, category and recovery readiness. Formula: Category by age-adjusted RMSSD: 20-30y >60 high, 50-60 moderate, <30 low. Example: At 30, RMSSD 45ms: moderate.

How to Use This Calculator

1Enter RMSSD from wearable (ms) and age.
2Calculate to see category and recovery hint.
3Compare to 7-day average, not absolute.

Formula Used

Category by age-adjusted RMSSD: 20-30y >60 high, 50-60 moderate, <30 low; decreases ~5ms per decade

HRV RMSSD reflects parasympathetic activity. Higher is generally better recovery and fitness, but varies by age, fitness and stress. This gives age-adjusted category.

Track trend, not single value. Morning HRV drop 10-20% suggests fatigue. This is wellness, not medical diagnosis.

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Worked Example

At 30, RMSSD 45ms: moderate. At 50, same 45ms is good. At 25, 70ms is high.

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Frequently Asked Questions

QWhat is RMSSD?

Root mean square of successive differences, common HRV metric from ECG/PPG.

QWhat is good?

Age-dependent. 30y: >60 high, 40-60 moderate; 50y: >40 high. Trend matters more.

QLow HRV?

May indicate stress, poor sleep or overtraining. Improve sleep, stress, training load.

Formula Used

Category by age-adjusted RMSSD: 20-30y >60 high, 50-60 moderate, <30 low; decreases ~5ms per decade

HRV RMSSD reflects parasympathetic activity. Higher is generally better recovery and fitness, but varies by age, fitness and stress. This gives age-adjusted category.

Track trend, not single value. Morning HRV drop 10-20% suggests fatigue. This is wellness, not medical diagnosis.