Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Melatonin Timing Calculator

Determine the best time to take melatonin to shift your body clock to a new bedtime. Useful when adjusting sleep schedules, recovering from jet lag, or managing delayed sleep phase.

Desired Bedtime (24h (e.g. 22.5))

Current Bedtime (24h (24 = midnight))

Age (years)

Melatonin Dosage

Fill in the required fields to see your result.

Sleep

Sleep Efficiency Calculator

Measure what percentage of your time in bed is actually spent sleeping — a key clinical marker of sleep quality used in insomnia diagnosis and treatment. Efficiency above 85% indicates healthy sleep; under 80% suggests insomnia or fragmented sleep that warrants investigation.

Time Actually Asleep (hours)

Time Spent in Bed (hours)

Fill in the required fields to see your result.

Key differences

	Melatonin Timing Calculator	Sleep Efficiency Calculator
Category	Sleep	Sleep
Inputs required	4	2
Result	Take Melatonin This Many Minutes Before Desired Bedtime (minutes)	Sleep Efficiency (%)
What it does	Determine the best time to take melatonin to shift your body clock to a new bedtime. Useful when adjusting sleep schedules, recovering from jet lag, or managing delayed sleep phase.	Measure what percentage of your time in bed is actually spent sleeping — a key clinical marker of sleep quality used in insomnia diagnosis and treatment. Efficiency above 85% indicates healthy sleep; under 80% suggests insomnia or fragmented sleep that warrants investigation.