Shift Overlap Calculator | Compare Two Work Shifts

SHIFT OVERLAP SETTINGS

P665

STEP 1: SHIFT TYPES

SETUP

SHIFT A

DAY

Adds 24h to A end

SHIFT B

DAY

Adds 24h to B end

NEXT: ENTER SHIFT A

Set overnight only when a shift ends after midnight.

A same day • B same day

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SHIFT A TIMES

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STEP 2: SHIFT A

A

A START

A-S

24-hour time

A END

A-E

End time

SHIFT A PREVIEW

A: 08:00 to 16:00

Use NEXT to enter Shift B.

SHIFT B TIMES

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STEP 3: SHIFT B

B

B START

B-S

24-hour time

B END

B-E

End time

READY TO SOLVE

B: 12:00 to 20:30

Press SOLVE to open the working screen.

RESULT AND WORKING

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STEP 4: OVERLAP

RESULT

—

OVERLAP

READY

—

Use PREVIOUS to edit the shift times.

WHAT IT DOES

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SHIFT OVERLAP TOOL

INFO

Compare

Enter two work shifts and find when both are active.

Output

Overlap is shown in minutes plus hours and minutes.

Night

Each shift can be marked overnight if it finishes after midnight.

Zero

If shifts do not overlap, the answer is zero minutes.

The calculator is split across four clear screens.

HOW TO USE

P665-6

USING THE CALCULATOR

GUIDE

Step 1

Choose whether either shift is overnight.

Step 2

Enter Shift A start and end times.

Step 3

Enter Shift B start and end times.

Step 4

Press SOLVE to see the shared overlap.

Enter solves quickly while editing a field.

SAME DAY SHIFTS

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DAY SHIFT OVERLAP

DAY

Use for

Shifts that start and finish before midnight.

Example

A is 08:00–16:00 and B is 12:00–20:30.

Overlap

Both shifts are active from 12:00 until 16:00.

Answer

The overlap is 240 minutes, or 4h 0m.

Day examples sit on a full-size page.

OVERNIGHT SHIFTS

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AFTER MIDNIGHT

NIGHT

Use when

A shift starts one day and finishes after midnight.

Method

The calculator adds 1440 minutes to that end time.

Either

Shift A and Shift B each have their own overnight setting.

Check

If an end is before a start, select overnight.

Night-shift help is off the input screens.

FORMULA

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OVERLAP FORMULA

MATHS

Start

Overlap start is the later of the two shift starts.

End

Overlap end is the earlier of the two shift ends.

Length

Overlap length is end minus start.

Clamp

If the value is negative, return zero.

Formula: max(0, min(end) − max(start)).

EXAMPLES

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WORKED EXAMPLES

HELP

Example 1

08:00–16:00 and 12:00–20:30 overlap for 4 hours.

Example 2

09:00–13:00 and 14:00–18:00 overlap for 0 minutes.

Example 3

22:00–06:00 needs overnight mode for the end time.

Example 4

Shared handover windows can be checked with the same formula.

Examples are split away from the tool screens.

WHO USES IT

P665-11

USERS

USE

Managers

Check staffing overlap, handovers and rota cover.

Workers

Compare two shifts or colleague availability.

Teams

Plan shared tasks needing people at the same time.

Students

Understand interval overlap problems.

Each purpose gets readable full-height space.

USE CASES

P665-12

COMMON USE CASES

TASKS

Rota

Find when two employees are both on shift.

Handover

Check time available for handover.

Cover

Confirm shifts overlap enough for cover.

Planning

Compare working windows for shared jobs.

Support copy is separated from the calculator.

SEARCH INTENT

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COMMON SEARCHES

SEO

Overlap

shift overlap calculator, schedule overlap calculator.

Compare

compare two shifts, compare two time ranges.

Rota

rota overlap calculator, staff handover time.

Night

overnight shift overlap, shifts across midnight.

SEO copy is concise and separated from controls.

FAQ

P665-14

SHIFT OVERLAP FAQ

FAQ

Format?

Use 24-hour HH:MM format such as 08:00 or 20:30.

No overlap?

The calculator shows 0 minutes.

Night?

Use overnight for shifts finishing after midnight.

Both?

Both shifts can be overnight independently.

NEXT opens related tools, then loops back.