Why 7:45 Is Not 7.45 Hours: The Math Behind Timesheet Decimal Conversion

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Converting time from hours-and-minutes format to decimal hours is a common requirement in payroll, billing, and project management systems. The correct formula divides minutes by 60 and seconds by 3600, then adds the result to the whole hours — so 7 hours 45 minutes equals 7.75, not 7.45. A frequent error occurs when people treat the minutes portion as a decimal directly, which leads to miscalculations in cost and billing reports. The reverse conversion is equally straightforward: multiply the decimal portion by 60 to recover the minutes. For teams handling large datasets, using a dedicated calculator or spreadsheet formula reduces manual errors and speeds up timesheet processing.

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