Is there an optimal way to calculate how much does my AWS architecture cost per user using my app?

Hi!

Right now we have an app deployed in AWS and the costs we have now are coming from the development team since we are still developing our app.

There is a way to do a calculation to know how much will our AWS architecture cost per user when we deploy the app in production? Or until we don't do the deployment and see the real costs there is no way to do this estimation?

Thank you!