$VC = Connect-VIServer "<your vCenter Server here>"
$grandtotalGB = 0
$grandtotalGHz = 0
$Clusters = Get-Cluster -Location "<If needed, else delete it from -Location>" | sort name
foreach ($Cluster in $Clusters) {
$TotalGB = 0
$TotalGHz = 0
 
$ESXHosts = $Cluster | Get-VMHost | sort name
Write-Host $Cluster.name
foreach ($ESXHost in $ESXHosts) {
$ESXHostProp = $ESXHost | get-view
$ESXTotalGHz = [Math]::round($ESXHostProp.Hardware.CpuInfo.Hz/ 1GB) * $ESXHostProp.Hardware.CpuInfo.NumCpuCores
$ESXTotalGB = [Math]::round($ESXHostProp.Hardware.MemorySize/ 1GB)
$TotalGHz = $TotalGHz + $ESXTotalGhz
$TotalGB = $TotalGB + $ESXTotalGB
Write-Host " " $ESXHost.name ": Total GHz:" $ESXTotalGhz "- Total GB:" $ESXTotalGB
}
$TotalAvailableGB = $TotalGB-$ESXTotalGB
$TotalAvailableGHz = $TotalGHz-$ESXTotalGHz
Write-Host "Total GB =" $TotalGB
Write-Host "Total Available GB (n-1) =" $TotalAvailableGB
Write-Host "Total GHz =" $TotalGHz
Write-Host "Total Available GHz (n-1) =" $TotalAvailableGHz
Write-Host "-------------------------------------------------------------------"
$grandtotalGB = $grandtotalGB + $TotalAvailableGB
$grandtotalGHz = $grandtotalGHz + $TotalAvailableGHz
}
Write-Host "Total Available Memory : $grandtotalGB GB"
Write-Host "Total Available CPU : $grandtotalGHz GHz"
Get-Datastore | sort name | ft name,@{ Label = "FreespaceGB"; Expression = { [Math]::round($_.FreeSpaceMB * 1MB / 1GB) } }, @{ Label = "CapacityGB"; Expression = { [Math]::round($_.CapacityMB * 1MB / 1GB) } }

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