Why do I need to specify 'end time is the next day'?

A clock time alone (like 6:00 AM) doesn't say which day it falls on — without the toggle, an end time earlier in the day than the start time would appear to be a negative duration. Turning it on tells the calculator to treat the end time as the following day, correctly handling overnight shifts.

Does this work for shifts longer than 24 hours?

No — this tool is built for a single start and end clock time within a one-day (or overnight) span. For a duration spanning multiple full days, the Date Calculator's difference mode, combined with clock times, is a better fit.

Why is the result shown in decimal hours as well as hours and minutes?

Payroll systems and hourly billing typically require a decimal hours figure (like 7.5) to multiply against an hourly rate, while hours-and-minutes is more intuitive to read at a glance — this tool provides both so you have whichever format you need.

Can I calculate the duration of a lunch break or meeting the same way?

Yes — enter the start and end time of any period, whether it's a work shift, a meeting, a break, or an event, and the tool calculates the exact elapsed duration between them.

What happens if I enter the same start and end time?

The result shows a duration of 0 hours 0 minutes, correctly reflecting that no time elapsed between an identical start and end time.

Elapsed Time Calculator — Free Online Tool

Features

Runs entirely in your browser
Privacy-first — your data is never uploaded
Real-time, instant results
100% free, no sign-up required
Works on desktop, tablet, and mobile
No installation needed

Who uses this tool?

StudentsHomeownersEveryday plannersTeachers

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About Elapsed Time Calculator

Figuring out how long a shift, meeting, or event lasted from its start and end clock times sounds trivial, until the end time is on the other side of midnight — a shift running from 10:00 PM to 6:00 AM isn't a simple subtraction, since the end time appears to be "before" the start time on a 24-hour clock unless you account for the day rollover.

This tool takes a start time and end time and calculates the exact duration between them in hours and minutes, plus decimal hours and total minutes. A dedicated toggle for "end time is the next day" handles the overnight-shift case correctly, adding a full 24 hours before calculating so a 10:00 PM to 6:00 AM shift correctly comes out to 8 hours rather than a nonsensical negative number.

This is genuinely useful for payroll and timesheet calculations (converting a recorded start/end punch into total hours worked), scheduling (checking exactly how long a meeting or event block runs), and any situation where you have two clock times and need the elapsed duration between them — distinct from adding or subtracting already-known durations, which the separate Time Calculator handles.

The result includes decimal hours specifically because payroll systems and hourly-rate calculations typically need duration expressed as a decimal (like 7.5 hours) rather than the more intuitive but less calculation-friendly "7 hours 30 minutes" format.

How it works

Enter the start time. The clock time the period began.
Enter the end time. The clock time the period ended. Toggle 'next day' if it spans midnight.
View the duration. Shown as hours and minutes, plus decimal hours and total minutes.

Examples

Same-day duration

Input

9:00 AM to 5:30 PM

Output

8h 30m (8.5 decimal hours)

Overnight shift