Formulas can be set in Kintone apps.
Formulas can be used to do things like sum up the values of multiple fields or perform calculations based on the values and selections of certain fields.

Formulas can only be used with Calculated and Text fields. When you enter a formula, you need to use field codes to refer to any fields that you want to include in it.
See the articles in this category for various ways to use formulas.