Percentage Calculator
Work out percentages, increases and discounts instantly.
Use ToolEnter a start and end time to get the duration in hours and minutes, including shifts that cross midnight.
Enter valid values to see the result instantly.
The tool converts both times to minutes since midnight and subtracts them. If the end time is earlier than the start, it assumes the period runs overnight and adds a full day.
That makes it suitable for night shifts, flight times, study sessions and billing by the hour.
There is nothing to submit or wait for — the result updates as soon as you change something.
No account, no sign-up and no daily cap — use it as often as you need.
The layout, buttons and inputs are built mobile-first and are fully keyboard accessible.
Work out percentages, increases and discounts instantly.
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Use ToolBrowse every calculators or see the full tool list.