Time Duration Calculator
Enter every measurement Time Duration Calculator asks for, then press Calculate. The result stays blank while you are still typing.
Press Calculate after the entries are in.
What Time Duration is for
Time Duration Calculator is the page to open when you need time duration from measurements you already have. It belongs with the other time & date calculators because that is the work this arithmetic supports. Age across those dates is the age from a birth date. Type the entries first. The result stays hidden until you press Calculate, so a half-finished form never flashes a number you might mistake for the answer.
How to fill in this calculator
- Start Time. Enter the value this part of the job needs.
- End Time. Enter the value this part of the job needs.
The formula in plain language
To add fractions, convert them to a common denominator, add the numerators, and reduce. A mixed number is a whole plus a fraction. Multiply the whole by the denominator and add the numerator before you do arithmetic. A ratio a:b = c:d solves for the missing term by cross-multiplying. Long division splits a number into a whole quotient and a remainder.
A worked example
1/2 plus 1/3 is 5/6. The mixed number 2 1/4 is 9/4. If 2:3 equals 8:d, then d is 12. 100 divided by 6 is 16 with a remainder of 4, or 16.666....
Dates, ages, and clock times borrow months and hours the same way. This time duration result belongs with time card hours and week count.
Mistakes that move the answer
- A denominator of zero is not a fraction.
- Reduce the answer if you are comparing it with a tape that is marked in sixteenths.
How to check the result
After Calculate shows the time duration result, redo the last operation with a pencil using the rounded figures on the screen. Matching that check means the inputs were read correctly. If you edit a label or a sentence in this HTML file, reload the page. The form and this article both live in the file, so the edit is what visitors will read.