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HRV Readiness Report
Enter your average HRV (RMSSD) to get a personalized readiness report — your percentile for your age and sex cohort, a training readiness score, interpretation, and shareable result card.
Found in Apple Health, Garmin, Whoop, or Oura
Used to match the correct population norms (biological sex at birth)
Your morning resting heart rate — used alongside HRV for readiness scoring
What does this HRV report measure?
This tool calculates your RMSSD heart rate variability percentile by comparing your value to population norms for your age group and biological sex, derived from peer-reviewed research including Shaffer & Ginsberg (2017) in Frontiers in Public Health and Sammito et al. (2016) in Heart Rhythm. RMSSD (root mean square of successive differences) is the most commonly reported HRV metric on consumer wearables including Apple Watch, Garmin, Whoop, and Oura.
The report also generates a training readiness category — Low, Moderate, Good, or Excellent — based on your percentile ranking and, if provided, your resting heart rate. This gives you a clinically grounded, actionable signal rather than a raw number with no context.
How are HRV percentiles calculated?
HRV percentile rankings are calculated using piecewise linear interpolation between population norm breakpoints (10th, 25th, 50th, 75th, and 90th percentiles) from published research. A percentile of 65 means your HRV is higher than approximately 65% of people in your age and sex cohort.
Important: population norms reflect overnight or morning RMSSD measured with consistent wearable devices. Day-to-day variation of 10–30% is normal and expected.
What is training readiness and how is it scored?
Training readiness in this tool is a composite signal derived primarily from HRV percentile (70% weight) with optional adjustment for resting heart rate deviation (30% weight).
The four readiness categories map to practical training decisions: Excellent — high-intensity work appropriate; Good — moderate training appropriate; Moderate — easy aerobic or light strength work only; Low — rest or active recovery recommended.
How to improve your HRV over time
The most evidence-backed levers for raising HRV baseline are: consistent aerobic training, prioritizing sleep, reducing alcohol, managing chronic stress, and maintaining healthy body composition.
Related tools and resources
- See the full HRV chart by age for population norms across all age groups
- Learn the fundamentals in our guide What is HRV?
- Use the Recovery Readiness Calculator to combine HRV with sleep and soreness for a daily go/no-go decision
- Check your Resting Heart Rate for a complementary cardiovascular fitness signal
Frequently Asked Questions
What HRV value is considered good?
There is no single good HRV number — what matters is where you fall relative to your age and sex cohort. Use the percentile output from this tool to contextualize your number.
How often should I check my HRV readiness?
Daily morning readings give the most consistent data. For training decisions, use your 7-day rolling average rather than a single reading.
Why is my HRV different on different devices?
HRV measurement methodology varies by device. Pick one device and stick with it for consistent trend data.
Can I share my HRV report with my coach or doctor?
Yes — the shareable link encodes your inputs in the URL so your report can be bookmarked, sent, or embedded. Use the Save as Image or Download PDF buttons for offline sharing.
Should I use RMSSD or a different HRV metric?
RMSSD is the recommended HRV metric for daily readiness monitoring and is what most consumer wearables report.
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