Digital Stopwatch Timer Calculator

About this Calculator

This time calculator for minutes, seconds and tenths of seconds will add and subtract time in the form mm:ss.s or minutes:seconds.tenths and keep a running total like an adding machine. Totals will accumulate in hours when necessary. Enter values according to allowed time entry formats below.  You should be able to use this keypad-only without a mouse. To cause subtraction you can enter a negative sign before the value such as -5:22.1.

Time Entry Formats

You can use a dash (-), period (.), colon (:) or blank space ( ) as the minute/second separator.  For example, 5-06.2, 5.06.2, 5:06.2, and 5 06.2 are all interpreted as 5 minutes 6 seconds and 2 tenths or 5:06.2.

Seconds are the default: Entries of an integer-only or integer plus a decimal fraction will be interpreted as seconds and tenths of seconds.

A leading dash or negative sign will cause it to be a negative value.

Entry limits allowed:

• minutes 0 to 59
• seconds 0 to 59
• tenths of seconds 0 to 9

You can use numbers and the enter button on your keyboard without using your mouse except to change the operation to subtraction. You can also enter negative numbers (-4.5.8) from your keypad then you do not need to change to subtraction.