Compare calculators

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

Optimal Bedtime Calculator

Work out exactly what time to go to bed so you wake up feeling rested and aligned with full sleep cycles. Perfect for anyone who wants to stop waking up groggy.

Wake Time (24h format) (hour)

Required Sleep Duration (hours)

Time to Fall Asleep (minutes)

Sleep Cycle Preference

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

	Optimal Bedtime Calculator	Shift Work Sleep Calculator
Category	Sleep	Sleep
Inputs required	4	2
Result	Optimal Bedtime (hour)	Recommended Sleep Start (hours)
What it does	Work out exactly what time to go to bed so you wake up feeling rested and aligned with full sleep cycles. Perfect for anyone who wants to stop waking up groggy.	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.