Convert between standard hours-and-minutes format and decimal hours — the format most payroll and invoicing systems expect (e.g. 7:30 becomes 7.5).
Also covers: hours to decimal, decimal hours
A simple, accurate desk clock for the times a screen isn't handy.
Decimal hours (like 7.5 instead of 7:30) are easier to multiply by an hourly rate, which is why most timesheet and payroll software store time this way.
45 minutes is 0.75 of an hour, so 3 hours 45 minutes becomes 3.75 in decimal form.