There is no simple estimate. You will need to decide what you want to run with and run it through some calculations.
Start at https://confluence.atlassian.com/enterprise/node-sizing-overview-for-atlassian-data-center-941612709.html to think about how to size your nodes, and then https://azure.microsoft.com/en-gb/pricing/calculator/?cdn=disable to help you cost that side of it
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.