Time to Hours Calculator

Convert HH:MM:SS to hours

Enter hours, minutes, and seconds. Tap Calculate to get total hours (decimal).

Hours
Minutes
Seconds
hrs
min
sec
Enter a time and tap Calculate.
Time conversion calculators
24-Hour → 12-Hour Military Time Time → Decimal Decimal Hours → HH:MM:SS Minutes → HH:MM:SS Seconds → HH:MM:SS Time → Minutes Time → Seconds Any unit ↔ any unit

Time → hours — quick FAQ

Which inputs are accepted?

Numbers in the three boxes. Seconds can include decimals (comma or dot). Any empty box is treated as zero.

Can minutes or seconds exceed 59?

Yes. We compute from the total duration, so over-60 values still produce the correct hour total.

What shows in the result?

Only the clean equality line with H:MM:SS on the left and total hours (decimal) on the right.

How we turn hours, minutes, and seconds into one number

The core formula (decimal hours)

To convert a timestamp to hours, divide minutes by 60 and seconds by 3,600, then add them to the hour value you entered. In shorthand: total hours = hours + (minutes ÷ 60) + (seconds ÷ 3600). Because these are fixed units, time zones and daylight saving never affect the answer.

Fast, forgiving input

The three fields live inside one rounded group so the control reads as a single line—just like a digital time entry. You can leave unused boxes blank; they count as zero. Seconds accept decimals with either a dot or a comma. If you paste over-60 values into minutes or seconds, we still return the right total because the conversion is based on total duration, not clock rules.

Copy-ready output

The result is a single equality statement: a normalized H:MM:SS on the left and the total hours on the right using your locale’s number formatting. There’s no extra wording, so you can paste the line directly into an estimate, an invoice, or a spreadsheet that expects hours as a decimal.

Why hours are useful
  • Billing and invoicing: decimal hours plug straight into hourly rates.
  • Scheduling and capacity: totals in hours make it easy to compare tasks and blocks.
  • Analytics: many BI tools chart work or runtime in hours by default.
Examples you can check
  • 02:30:00 → 2.5 hours.
  • 00:45:30 → 0.758333… hours (rounded to your locale).
  • 01:90:00 → 2.5 hours (we accept the overflow).
Need a different format?

To show an hour total as HH:MM:SS, use Decimal Hours → HH:MM:SS. If you need other totals, try Time → Minutes or Time → Seconds. For converting time strings to decimal hours or minutes in one step, see Time → Decimal. For any other pair—from weeks to microseconds—open Time Unit Conversions.

From day counts to smaller units

Working from whole days? Jump straight to Days → Minutes or Days → Seconds, then divide as needed. Planning around a specific calendar date? See what date is 365 days from today and related date tools.

Tips for clean data
  • Keep entries numeric; we ignore spaces and accept one decimal point/comma in the seconds box.
  • Use the output line for copy/paste—locale separators are applied automatically.
  • If your sheet expects a certain precision (e.g., two decimals), round there; we keep up to six fractional places.
Privacy and limits

All math runs locally in your browser; nothing leaves your device. The calculator doesn’t apply calendar logic—use our date tools if you need weekdays, holidays, or precise target dates after converting your time span to hours.