Add durations together — 2:45 plus 3:30 plus 1:15 — and get the total in both h:mm and decimal hours. Use a minus sign to subtract.
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This is the single most expensive confusion in timekeeping. 2:45 means two hours and forty-five minutes. 2.45 means two and forty-five hundredths of an hour, which is two hours and twenty-seven minutes. The gap is eighteen minutes, and it appears on every line of a timesheet that mixes the two.
The conversion is division by sixty: 45 ÷ 60 = 0.75, so 2:45 is 2.75 in decimal. The results above show both, because you need h:mm to fill in a timesheet and decimal to multiply by an hourly rate. Multiplying 2:45 by a rate directly gives a wrong invoice.
Subtraction works the same way. Enter a duration with a minus sign — −0:45 to take three quarters of an hour off — and the total can go negative, which is what you want when reconciling hours owed against hours worked.
The minutes come to 75, which is one hour and fifteen. Carry the hour: 2 + 3 + 1 = 6, leaving 15 minutes. The answer is 6:15. Typing 2.45 + 3.30 into a calculator gives 5.75, which is a different quantity entirely.
Colons for h:mm (2:45), the h and m form (2h45, 90m), or a plain number for hours (1.5 or 1,5 for ninety minutes). A number on its own is read as hours, so type 45m when you mean forty-five minutes.
Yes, and it should. Five eight-hour days come to 40:00, not 16:00 — a duration is not a clock time, and wrapping it at 24 would turn a week of work into fiction.
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