"1d 2h 3m 4s + 4h 5s - 2030s" is an example of a valid expression. The only acceptable operators are + and. An acceptable input has d, h, m, and s following each value, where d means days, h means hours, m means minutes, and s means seconds. Use this calculator to add or subtract two or more time values in the form of an expression. 3) In order to get a total in the right hand column. (or for greater ease, just enter 11.5) Whole hours may be entered without any decimal points. 2) Instead of entering times with a colon (e.g. 1) There is no need to enter time as 'a.m.' 'p.m.' or '24 hour' time. With decimal hours you can simply multiple the number of hours with an employees pay-rate and get the amount owed. Decimal hours are used to simplify payroll and time management. On this page, you can convert time values specified in hours, minutes and seconds to decimal hours and vice-versa.The hours and minutes to decimal hours follows an algorithm that goes as such: Total Hours + Total Minutes/60 + Total Seconds/3600 = Total Decimal Hours. Our online tools will provide quick answers to your calculation and conversion needs. Hours minutes seconds to decimal hour converter. RelatedCalculators » Date & Time » Decimal Time Conversion. Before we start with the details of the decimal to fraction calculator, let's understand its function. mixed number calculator will find the lowest common denominator, which is the lowest multiple of both. The calculator has options for the: decimal value (one value at a time), the rounding value, and the rounding type.