Compare calculators

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

Business Hours Overlap Calculator

Find the overlapping working hours between two offices in different time zones. Use it to schedule meetings, calls, or collaborative sessions without forcing either team outside normal hours.

Office 1 Start Hour (hour (0-23))

Office 1 End Hour (hour (0-23))

Office 1 Time Zone Offset (hours from UTC)

Office 2 Time Zone Offset (hours from UTC)

Office 2 Business Hours

Fill in the required fields to see your result.

Time Zones

Global Work Shift Overlap Calculator

Calculate how many hours two globally distributed teams actually share during their working days by converting both shifts to UTC and intersecting them. Use it to plan handoffs, standups, or pair-programming windows between offices in different cities.

Team 1 Time Zone

Team 2 Time Zone

Team 1 Work Start (:00)

Team 1 Work End (:00)

Team 2 Work Start (:00)

Team 2 Work End (:00)

Fill in the required fields to see your result.

Key differences

	Business Hours Overlap Calculator	Global Work Shift Overlap Calculator
Category	Time Zones	Time Zones
Inputs required	5	6
Result	Overlapping Hours (hours/day)	Overlapping Work Hours (hours)
What it does	Find the overlapping working hours between two offices in different time zones. Use it to schedule meetings, calls, or collaborative sessions without forcing either team outside normal hours.	Calculate how many hours two globally distributed teams actually share during their working days by converting both shifts to UTC and intersecting them. Use it to plan handoffs, standups, or pair-programming windows between offices in different cities.