What does the result mean?

The result is an interpolated position on Nyxova’s configured table, not a verified population percentile or fitness assessment. The derivation of the exact table values is not documented here.

What input does this calculator use?

Enter RMSSD in milliseconds. The table and calculation are unchanged; do not compare a different HRV metric such as SDNN with this table.

HRV Reference Table Calculator — RMSSD Table Position

RMSSD only: This calculator uses RMSSD values. Oura, Garmin, and Whoop all report RMSSD. Apple Watch reports SDNN — a different metric that cannot be compared here.

Age

Sex

Your HRV — RMSSD (ms)

Position on Nyxova table

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Configured reference values — provenance unverified

Age	Male — anchors 10/25/50/75/90	Female — anchors 10/25/50/75/90
18–25	28 / 38 / 55 / 70 / 85	30 / 42 / 60 / 76 / 90
26–35	22 / 32 / 48 / 62 / 75	24 / 35 / 52 / 66 / 80
36–45	18 / 27 / 40 / 53 / 65	19 / 29 / 43 / 57 / 68
46–55	14 / 22 / 33 / 44 / 55	15 / 24 / 36 / 48 / 58
56–65	11 / 18 / 28 / 37 / 46	12 / 19 / 30 / 40 / 48
66+	8 / 14 / 22 / 31 / 38	9 / 15 / 24 / 32 / 40

Previously cited background: Shaffer & Ginsberg (2017); Altini & Kinnunen (2021). An exact source table or derivation for the numbers above is not documented here. These citations do not establish the displayed population percentiles. The code interpolates between the five configured anchors and extrapolates outside them, with results limited to 1–99.

Not medical advice: The result describes this configured table, not your rank in a measured population. A single HRV reading is less meaningful than your trend over weeks. Consult a clinician for health concerns.

HRV Percentile Calculator

Configured reference values — provenance unverified

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