Time Calculator & Statistics — Duration, Age, Workday, Work Hours & More
Time Calculator & Statistics
Calculate durations, track work hours, compute your exact age, count business days, and perform time arithmetic.
All processing happens locally in your browser — your data is never uploaded to any server.
Enter one value or multiple separated by commas
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Duration Calc: Enter time durations in HH:MM:SS format (one per line). Supports sum, average, min, and max.
Workday Count: Calculates business days between two dates, optionally excluding weekends and major US holidays.
Payroll Hours: Convert HH:MM to decimal hours. Useful for timesheet calculations.
Date Span: Shows all relevant metrics between two dates: calendar days, weeks, months, years, and time remaining.
Times vs durations
A time of day is a label on a clock face (00:00 to 23:59) and always wraps around; a duration is an amount of time and can be any length — 47:30 is a perfectly good duration but not a time of day. Adding 1:30 + 2:45 as durations gives 4:15; treating them as clock times would wrap or reset instead.
HH:MM:SS is sexagesimal — carrying happens at 60, not 10, so 0:90 minutes is 1:30; and payroll systems want decimal hours (1:30 = 1.5 h), never 1.30, a classic timesheet error.
