As per your description, you are trying to build a Single-Server farm that uses SQL Server on the same server. plus you need to install AD on the same farm.
Initially, this topology will work but it's heavily recommended to isolate the AD from the SharePoint farm even if it's
Single-Server farm to avoid the performance issue.
Single-Server farm with AD installed is not supported in production environments, and generally, the
Single-Server farm should be used for development and learning purpose!
Regarding the minimum requirement,
You can get all details at Hardware and software requirements for SharePoint Server 2016
And based on the above link, the minimum hardware specification for
Single-Server farm are :
- RAM: 16 GB.
- Processor: 64-bit, 4 cores.
- Harddisk space: 80 GB for system drive, 100 GB for the second drive.
It's the minimum hardware specification, you can scale it up as you prefer based on your budget/requirements and actually, this is will lead to good performance.
Regarding the tools,
I don't think there is a tool to architect your farm and suggest the minimum requirements because it will depend on a lot of different factors and differ from farm to farm and client requirements to other and this is the main job of your SharePoint architect,
Based on my humble knowledge, the currently available tools for measuring the performance and perform Performance test.
Meanwhile, I don't think you will need an independent tool to specify the minimum resources for a single-server farm where you can follow what I have mentioned in the above second section.