Calculator

Measure HRV directly with a Polar H10, import an existing report, or enter values manually. Direct measurements use a standardized supine protocol and calculate the HRV parameters locally from the received RR intervals.

How do you want to provide HRV values?

Measure with Polar H10

Recommended for a new standardized recording

Polar measurement requires a compatible browser with Web Bluetooth and permission to connect to nearby Bluetooth devices. Raw RR intervals and calculated values remain in the current browser session.

Upload or paste a report

Use values calculated by existing HRV software

Enter values manually

Use previously calculated HRV parameters

Fill in the HRV value fields in the form below.

Age*(years)

Age-specific reference percentiles cover 18–72 years.

Reference sex

HRV values

Decimal points and decimal commas are both accepted. At least RMSSD or SDNN is required.

RMSSD(ms)

Primary five-minute HRV metric.

SDNN(ms)

Overall variability during the five-minute recording.

pNN50(%)

Frequency-domain data

LF and HF powerLF/HF ratio only

HF power(ms²)

Enter absolute spectral power in ms². Do not enter normalized units, percentages or log-transformed values.

LF power(ms²)

Enter absolute spectral power in ms². Do not enter normalized units, percentages or log-transformed values.