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

Shift Work Sleep Calculator

Calculate when you should go to sleep to get 8 hours of rest before your shift, accounting for commute time. Essential for night-shift and rotating-schedule workers.

Shift Start Time (hours (24h format))

Commute Time (hours)

Fill in the required fields to see your result.

Key differences

	Melatonin Timing Calculator	Shift Work Sleep Calculator
Category	Sleep	Sleep
Inputs required	4	2
Result	Take Melatonin This Many Minutes Before Desired Bedtime (minutes)	Recommended Sleep Start (hours)
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.	Calculate when you should go to sleep to get 8 hours of rest before your shift, accounting for commute time. Essential for night-shift and rotating-schedule workers.