Compare calculators

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

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.

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

	Shift Work Sleep Calculator	Sleep Efficiency Calculator
Category	Sleep	Sleep
Inputs required	2	2
Result	Recommended Sleep Start (hours)	Sleep Efficiency (%)
What it does	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.	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.