The **Computed Column** rule allows you to create new columns based on mathematical expressions. These mathematical expressions will often reference other columns in your report.

BriteCore supports the following mathematical operators:

- %
- &
- (
- )
- *
- +
- -
- /
- days
- months
- weeks

## Example expressions

- Total Payoff Amount = Premium Payoff Amount + Custom Fee Payoff Amount + System Fee Payoff Amount
- Net Written Premium = Item Written Premium * 0.63157894
- Property TIV = Coverage A Limit + Coverage B Limit + Coverage C Limit + Coverage D Limit + Coverage E Limit + Coverage F Limit
- Days Outstanding = Date Reported + 30 Days