Compare calculators

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

Jet Lag Recovery Calculator

Estimate the number of days needed to fully resync your circadian rhythm after long-haul travel, weighted by time-zone shift, direction (eastward is harder), age, and travel frequency. Use it before a trip to plan meetings and downtime realistically.

Time Zone Difference (hours)

Travel Direction

Age (years)

Travel Experience

Fill in the required fields to see your result.

Time Zones

Time Zone Sleep Schedule Adjuster

Calculates the recommended bedtime shift per day to gradually realign your sleep schedule before crossing multiple time zones. Use it when preparing for long-haul travel or a remote work shift change to minimize jet lag.

Current Sleep Time (:00)

Time Zone Change (hours)

Days Before Travel (days)

Sleep Adaptability

Fill in the required fields to see your result.

Key differences

	Jet Lag Recovery Calculator	Time Zone Sleep Schedule Adjuster
Category	Time Zones	Time Zones
Inputs required	4	4
Result	Recovery Time (days)	Adjusted Sleep Time (:00)
What it does	Estimate the number of days needed to fully resync your circadian rhythm after long-haul travel, weighted by time-zone shift, direction (eastward is harder), age, and travel frequency. Use it before a trip to plan meetings and downtime realistically.	Calculates the recommended bedtime shift per day to gradually realign your sleep schedule before crossing multiple time zones. Use it when preparing for long-haul travel or a remote work shift change to minimize jet lag.