Compare calculators

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

Shift Work Schedule Optimizer

Score any shift configuration for worker wellbeing by penalising antisocial start times, long durations, and consecutive shifts. Use it when designing rotas to minimise health and productivity risks.

Shift Start Time (hour (0-23))

Shift Duration (hours)

Worker Time Zone Offset (hours from UTC)

Consecutive Shifts (shifts)

Shift Pattern

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

	Shift Work Schedule Optimizer	Global Work Shift Overlap Calculator
Category	Time Zones	Time Zones
Inputs required	5	6
Result	Schedule Health Score (/100)	Overlapping Work Hours (hours)
What it does	Score any shift configuration for worker wellbeing by penalising antisocial start times, long durations, and consecutive shifts. Use it when designing rotas to minimise health and productivity risks.	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.