@Ilie Dercaci - Miro does not offer this functionality out of the box. You would need to build a custom app using Miro’s Developer Platform.

Wish List post

If you would like to see arithmetic capabilities built in to Miro, I’d recommend adding this as an Idea in the Wish List category by following the guidelines here: Wish List: Everything You Need to Know.

If you do create a Wish List Idea post, I would also recommend that you post a link to it back here, so that future readers of this post can quickly get to and vote for your Idea.