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If you want to compute time values use the `T`

flag, either in Calc
formulas or Elisp formulas:

| Task 1 | Task 2 | Total | |---------+----------+----------| | 2:12 | 1:47 | 03:59:00 | | 3:02:20 | -2:07:00 | 0.92 | #+TBLFM: @2$3=$1+$2;T::@3$3=$1+$2;t

Input duration values must be of the form `[HH:MM[:SS]`

, where seconds
are optional. With the `T`

flag, computed durations will be displayed
as `HH:MM:SS`

(see the first formula above). With the `t`

flag,
computed durations will be displayed according to the value of the variable
`org-table-duration-custom-format`

, which defaults to `'hours`

and
will display the result as a fraction of hours (see the second formula in the
example above).

Negative duration values can be manipulated as well, and integers will be considered as seconds in addition and subtraction.