Hardware Resource Planning for a SharePoint farm

Hi, I need to simplify this process...

At the <g class="gr_ gr_56 gr-alert gr_gramm Punctuation only-ins replaceWithoutSep" data-gr-id="56" id="56">moment</g> we are using a spreadsheet and update resources per server and a very manual process to try and calculate what we will need down the line to properly plan it.

We are moving over to a new server farm of 60 servers and then the old farm is still there with also about 35 servers.

There must be some tools that can make this <g class="gr_ gr_210 gr-alert gr_spell ContextualSpelling ins-del multiReplace" data-gr-id="210" id="210"><g class="gr_ gr_223 gr-alert gr_gramm Grammar multiReplace" data-gr-id="223" id="223">easyer</g></g>, specifically towards <g class="gr_ gr_256 gr-alert gr_gramm Punctuation multiReplace" data-gr-id="256" id="256"><g class="gr_ gr_254 gr-alert gr_gramm Grammar only-ins doubleReplace replaceWithoutSep" data-gr-id="254" id="254">ram</g> ,</g> CPU and disk usage?

To buy 3rd party software for this is not going to be an easy task so free tool would be great but if it is a paid solution then so be it.

We are trying to get them to buy SPDocIT and Metalogix Diagnostics <g class="gr_ gr_403 gr-alert gr_gramm Punctuation only-ins replaceWithoutSep" data-gr-id="403" id="403">Manager</g> but the procurement process is pretty lengthy if it happens.

Thanks

Not sure in which forum to post this so please let me know where to post this?