A neat little Excel worksheet for calculating the total amount of RAM you’ll want for a deployment of Hyper-V. Could use some polishing, but would make a great start for your documentation.
TONYSO : Hyper-V RAM Calculator
Joeelway’s blog links to a handy Hyper-V RAM Calculator you can use to plan your Hyper-V deployment. Easy to use:
# Specify how much RAM is in the physical host machine.
# Add each guest VM and enter how much RAM (in GB) you want to allocate to the guest.
# The RAM utilized by the guest is calculated and the amount remaining on the host is presented.