Whenever you design your software architecture based on AWS, you may need to know how must cost it will consume while serving your service - following service will help you to get your estimated cost.

AWS Simple Monthly Calculatorhttps://calculator.s3.amazonaws.com/index.html

Super simple and easy to use if you are familiar with AWS compontents. You can simply select region, compute instances, storage, expected run time, IP and etc.

AWS Pricing Calculator https://calculator.aws/#/

Calculator based on wizard for those who does not familiar with AWS components, but sometimes easy to select unnecessary components by its fantastic temptation.

Personally I prefer to use AWS Simple Monthly Calculator, but you may able to select your desired solution based on your need.