Calculators

Common tools

Selected calculator

AHI

Apneas and hypopneas per hour of EEG-based PSG sleep, with individual respiratory indices.

Obstructive apneas(count)Required — enter a known zero explicitly where applicable.Central apneas(count)Required — enter a known zero explicitly where applicable.Mixed apneas(count)Required — enter a known zero explicitly where applicable.Hypopneas(count)Required — enter a known zero explicitly where applicable.RERA scoring

Total sleep time(minutes)Required — enter a known zero explicitly where applicable.

Hypopnea ruleRequired — enter a known zero explicitly where applicable.

Result

Complete or correct the marked inputs to calculate. Blank values are not zero.

Total apneas = obstructive + central + mixed apneas

AHI = (total apneas + hypopneas) × 60 / TST minutes

Each apnea subtype / Hypopnea Index = corresponding count × 60 / TST minutes

RERA Index = RERAs × 60 / TST minutes

RDI = (total apneas + hypopneas + RERAs) × 60 / TST minutes = unrounded AHI + unrounded RERA Index

Full precision is used internally. Only displayed results are rounded, normally to one decimal place.

For training use. Follow your lab’s scoring rules and physician interpretation. Calculations use already-scored measurements, stay on this device, and do not diagnose or recommend treatment. Do not enter patient identifiers.