How to do math operations with time is explained below. See examples of adding, subtracting, multiplying and dividing segments of time. How to Add Time

If seconds has a decimal, you can usually leave this as your final answer depending on your applicationIf minutes has a decimal, keep the whole number as total minutes and convert the decimal to seconds Then, working from largest to smallest unit of time, convert any decimal values to whole numbers shifting the decimal amount to a smaller time unit

Large Stopwatch - Use the Stopwatch in FULL SCREEN. Great for meetings, classrooms, conferences, schools, anywhere really... :-)Divide days, hours, minutes and seconds by a divisor, working from smallest unit of time to largest. The calculator can add and subtract time segments or multiply and divide time by a number or decimal. Answers include equivalent time in total days, hours, minutes or seconds. How to Calculate Time