Seventeen simple tools for the numbers that come up every day — tips, percentages, loans, VAT, savings, debt, margin, fuel cost, BMI and more. Pick one to get started.
This time calculator does two everyday jobs. In “between times” mode it works out how long is between a start time and an end time — useful for a shift, a journey or a meeting. In “add / subtract” mode it takes a time and moves it forward or backward by a number of hours and minutes.
The calculator turns each time into minutes since midnight, subtracts the two, and converts the result back into hours and minutes. It also shows the same span in decimal hours and in total minutes, which is handy for timesheets and billing.
If the end time is earlier in the day than the start time — for example a night shift from 22:00 to 06:00 — the calculator assumes the end is on the next day and adds 24 hours, so you get 8 hours rather than a negative result.
Enter a start time, choose add or subtract, and type the hours and minutes to shift by. If the result rolls past midnight or before it, the calculator wraps the clock and tells you the day has changed (for example “+1 day”).
Many timesheets and invoices use decimal hours rather than hours and minutes: 8 hours 30 minutes is 8.5 hours, and 8 hours 15 minutes is 8.25. This tool shows the decimal figure automatically, so you can multiply by an hourly rate without converting by hand.
From 09:15 to 17:45 is 8 hours 30 minutes — 8.5 decimal hours, or 510 minutes. Add 3 hours 30 minutes to 23:00 and you land on 02:30 the next day.
Pick “between times”, enter the start and end time, and the calculator shows the gap in hours and minutes, decimal hours and total minutes.
If the end is earlier than the start, the tool assumes it is the next day and adds 24 hours — so 22:00 to 06:00 gives 8 hours, not a negative number.
Switch to “add / subtract”, enter a start time, choose add, and type the hours and minutes. The result wraps around the clock and shows if the day changes.
Decimal hours express minutes as a fraction: 30 minutes is 0.5, 15 minutes is 0.25. So 8 h 30 m is 8.5 decimal hours — handy for pay and invoices.
No — it works to the minute, which is enough for shifts, timesheets and everyday planning.