Time Calculator (Hour Minute Calculator)

Time Calculator is online tool that allows you to add time given in hh:mm:ss.ms (hour, minute,second,millisecond) format as well as decimal format. It could work as time converter that converts hours to minutes, minutes to hours, seconds to minutes, minutes to seconds, hours to seconds. It could also translate time given in decimal format (hh.dec, mm.dec) to regular time format (hh:mm:ss) and vice versa. You can fast end easy calculate how many minutes makes 24 hours, how many hours are made by 1000 minutes etc.

Accuracy number of significant decimal digits
Time Calculator


Time formats - Examples
hh:mm:ss.mshh hours, mm minutes, ss seconds, ms milliseconds
10:30:28.1210 hours, 30 minutes, 28 seconds, 120 milliseconds
72.5:1172 and half hour + 11 minutes = 72 hours and 41 minutes
:11:711 minutes and 7 seconds
:8888 minutes (one hour and 28 minutes)
::2828 seconds
Buttons And Keys
  • Button + : adds next data field preceding by sign '+'
  • Button - : adds next data field preceding by sign '-'
  • Reset : clears all data fields (resets to initial state)
  • red x : deletes data field
  • Keyboard shortcuts : '+' works like 'button +', '-' works like 'button -', 'Enter' works like 'button +'
  • Sign (+/-) Click on the sign left to the data field to change the sign '+/-'
Hour:minute:second calculator
  • Adding Time Calculator - this online tool can add time given in hh:mm:ss.ms time format as well as decimal time format. The sum appears in result window in hh:mm:ss and decimal time format.
  • Time Format Converter - To convert hour:minute:second time format, type the value into 'edit box'. Decimal format (in hours, minutes or seconds) will appear on the right side of the result window. To translate decimal time format (e.g 10.5 hours) just type the value into data field. The result will appear in the result window (10:30:00)
  • Minutes to hours, seconds to hours, ... conversion - Typing number of minutes e.g. :200 or seconds e.g. ::1000, you can get number of hours, minutes and seconds (3 hours and 20 minutes; 16 minutes and 40 seconds respectively)
  • Adding Time Intervals - If you have a list of time intervals (from hour HH:MM to hour hh:mm) you can easily sum this intervals preceding 'an hour FROM' by sign '-' and 'hour TO' by sign '+'.

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