Hours Calculator
Calculate time duration between any two times. Add multiple time blocks for timesheet totals. Include an hourly rate to calculate earnings.
8
Hours
0
Minutes
28800
Seconds
8.00
Decimal hrs
If end time is earlier than start, the calculator assumes an overnight shift.
- Total Hours
- 8
- Total Minutes
- 480
- Decimal Hours
- 8.00
- Rate
- —
How to use Hours Calculator
The hours calculator computes the total time between two times of day, supporting overnight shifts, optional break deduction and multi-day durations. It also calculates weekly totals across multiple shifts, converts the result to decimal hours and shows an earnings estimate if you provide an hourly rate — making it practical for timesheet completion and payroll.
- Enter a start time and end time (12-hour or 24-hour format).
- Optionally enter break duration in minutes to deduct.
- Add multiple shifts for a weekly total.
- Optionally enter an hourly rate to see earnings.
Your data never leaves your device — 100% private processing.
Overnight shifts and 24-hour arithmetic
When the end time is before the start time (e.g. 22:00 to 06:00), the calculator automatically adds 24 hours to the end time to give the correct 8-hour result rather than −16 hours. This handles night shifts, bartenders, healthcare workers and other overnight workers correctly.
Glossary
- Decimal hours
- Time expressed as a decimal fraction, e.g. 7.5 hours instead of 7 hours 30 minutes.
- Overtime
- Hours worked beyond the standard threshold (typically 8 hrs/day or 40 hrs/week) often paid at a premium rate.
Related reading
Frequently Asked Questions
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Why use Hours Calculator?
- Handles timezone conversions and DST automatically
- Supports date arithmetic across years and leap years
- ISO 8601 and human-readable output formats
- Works for historical and future dates with full accuracy
Common use cases
- Calculate how many days until a project deadline
- Find the day of the week for a date in the past
- Convert meeting times across different time zones
- Calculate age from a date of birth
- Add or subtract business days for contract terms
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