Not compatible with pf2e please do not enable this module with that system.
Input Expressions
This module makes it possible to enter mathematical expressions into numeric entry fields. This includes the token HUD, as well as many inputs on character and item sheets. These expressions support basic arithmatic, but also support anything from the Math.js library.
Additionally, there is a roll() helper function, which can be used to roll dice and get the result immediately.
roll(3d6)
When working with a token/actor, access to the attributes and abilities objects are also available. For more advanced users, entity allows access to the entire Entity, and data is a shortcut to its data property.