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Windows Server Licensing Calculator

Estimate and compare Standard vs Datacenter licensing costs for your cluster. Based on Microsoft OEM core-pack licensing rules — minimum 16 cores per host, 2-core increments.

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Cluster Configuration

Enter your physical infrastructure details

Physical servers in the cluster
Total CPU cores (all sockets)
All WS VMs across all hosts
How VMs are distributed for licensing purposes
Partner / volume discount (0 = no discount)
%
Base pack per host, USD
$
Base pack per host, USD
$
Per 2-core pack (remainder), USD
$
Per 2-core pack (remainder), USD
$
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Calculated Licensing Parameters

Auto-computed from your inputs

Effective Cores per Host (min 16)
Base 16-core Packs per Host
Remaining Cores after 16-core base(s)
Additional 2-core Packs per Host
Peak VMs per Host (Licensing Basis)
Standard License Stacking Factor (÷2 per license)
Standard 16-core Packs per Host
Standard 2-core Add-on Packs per Host
Datacenter 16-core Packs per Host
Datacenter 2-core Add-on Packs per Host
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How the Calculation Works

Microsoft OEM licensing rules explained

1
Effective cores: Microsoft requires a minimum of 16 cores licensed per host, regardless of actual core count.
Effective Cores = MAX(Physical Cores, 16)
2
Base 16-core packs: Each host needs 1 base 16-core pack (mandatory minimum). If cores exceed 16, you do NOT round up to the next full 16-core pack — instead you top up with cheaper 2-core add-on packs for the remainder.
Base 16-core Packs = 1 (minimum, always)
Remaining Cores = Effective Cores − (Base Packs × 16)
2-core Add-on Packs = CEILING(Remaining Cores / 2)
3
Standard stacking: Each Standard license set (16-core base + 2-core add-ons) covers 2 VMs. For N VMs you need CEILING(N/2) full license sets per host.
Stack Factor = CEILING(PeakVMs / 2)
Std 16-core/Host = Stack Factor × Base Packs
Std 2-core/Host = Stack Factor × 2-core Add-on Packs
4
Datacenter: One set of licenses (16-core base + 2-core add-ons) covers unlimited VMs. No stacking needed — always equals 1× the core-pack structure.
DC 16-core/Host = Base Packs (×1)
DC 2-core/Host = 2-core Add-on Packs (×1)
5
Recommendation: Whichever total cost (16-core + 2-core add-ons × all hosts) is lower.
IF(Total Std Cost < Total DC Cost → Standard)

Calculating…

Standard
Total Cost
Datacenter
Total Cost
Savings with recommended edition
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Cost Breakdown

Per host and total across cluster

Line Item Standard Datacenter
Base 16-core Packs per Host
Additional 2-core Packs per Host
License Set Cost per Host (before discount)
Stack Factor (Standard = ÷2 VMs / DC = ×1) ×1
Number of Hosts
Discount Applied
Total Cluster Cost
⚠️ Disclaimer: This calculator is for estimation and planning purposes only. Pricing may vary by region, channel, and Microsoft licensing agreements. Always verify final costs with your Microsoft licensing partner or reseller. Not affiliated with Microsoft Corporation.