Lifestyle

Body composition, nutrition, pregnancy and heart-health calculators based on WHO, NHS, ACOG and ACSM reference standards.

Sleep Calculator

Find the best bedtime or wake time using 90-minute sleep cycles plus 15 minutes to fall asleep. Three options for 9, 7.5 or 6 hours of sleep.

Calculate your weekly sleep debt by comparing hours slept against your target, plus your average sleep per night across recent nights.

Calculate sleep efficiency (total sleep time ÷ time in bed × 100) using the ≥85% clinical convention used in CBT-I and sleep-diary assessment.

Score the validated 8-item Epworth Sleepiness Scale (Johns 1991) to screen for excessive daytime sleepiness. A screening aid, not a diagnosis.