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

Melatonin Timing Calculator

Find your ideal melatonin dose and when to take it based on your weight, age, and sleep issue. Useful for shift workers, older adults, and anyone struggling to reset their sleep schedule.

Body Weight (kg)

Age (years)

Primary Sleep Issue

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	3	2
Result	Suggested Melatonin Dose (mg)	Recommended Sleep Start (hours)
What it does	Find your ideal melatonin dose and when to take it based on your weight, age, and sleep issue. Useful for shift workers, older adults, and anyone struggling to reset their sleep schedule.	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.