What does a Windows Server license cost? There is no fixed amount, because the total results from four quantities: the edition (Standard or Datacenter), the number of core licenses, the number of client access licenses (CALs) and, with Remote Desktop, the number of RDS CALs. For a small server with up to 16 cores and two virtual machines, that is one Standard base license and one CAL per user. This page shows how to determine your quantities; the
license calculator gives current amounts.
Quick decision
| Component | You need it if … | Quantity |
|---|---|---|
| Standard core licenses | the server runs no VMs or up to two | all cores, at least 16 |
| Another round of Standard licensing | two further VMs are added each time | all cores once more |
| Datacenter core licenses | many VMs run on the host | all cores, at least 16 |
| Windows Server CAL | employees access the server | per user or per device |
| RDS CAL | people work on the server via Remote Desktop | per user or per device, in addition |
Prices are deliberately not in this text: they change, and the right quantity is the bigger lever. If you count the cores wrongly or forget CALs, you are further off than with any price comparison.
Component 1: core licenses
All physical cores of the server are licensed, at least 8 per processor and at least 16 per server. Core licenses are sold in packs: a base license for 16 cores and additional licenses (Core Add-on) for every 2 further cores.
| Server | Core licenses | Combination |
|---|---|---|
| 1 processor, 8 cores | 16 | 1 base license (16 cores) |
| 1 processor, 16 cores | 16 | 1 base license |
| 1 processor, 20 cores | 20 | 1 base license and 2 Core Add-ons |
| 2 processors, 12 cores each | 24 | 1 base license and 4 Core Add-ons |
| 2 processors, 16 cores each | 32 | 32 core licenses, for example 2 base licenses |
A smaller processor does not lower the quantity below 16. A server with 4 or 6 cores needs the same base license as one with 16. Conversely, a processor with many cores drives the quantity up, even if the application does not make use of the cores. When choosing new hardware, it is therefore worth looking at the core count. The counting rules in detail:
Licensing Windows Server: cores, VMs, CALs.
Component 2: the edition and the number of VMs
Standard and Datacenter cost different amounts per core license. Datacenter costs more per core license but allows any number of virtual machines. Standard allows two per round of licensing; for every two further VMs you license all cores again.
For a host with two processors of 8 cores each, this means:
| Virtual machines | Standard | Datacenter |
|---|---|---|
| 2 | 16 core licenses | 16 core licenses |
| 4 | 32 core licenses | 16 core licenses |
| 8 | 64 core licenses | 16 core licenses |
With few VMs, Standard is the smaller bill; with many, Datacenter. The license calculator works out from the current prices where the line is for your server. The feature differences are in
Windows Server 2025 Standard or Datacenter.
Component 3: client access licenses (CALs)
The server license allows operation, not access. For every user or device that accesses the server, a Windows Server CAL is added. With many workstations, the CALs make up a noticeable part of the total.
- Count people or devices and take the smaller number: user CALs for employees with several devices, device CALs for shared workstations. How to weigh the two is explained in User CAL or device CAL.
- CALs are counted per organization, not per server. An employee with a user CAL may access all your licensed Windows Servers of the same or an earlier version.
- The CAL must match the server version or be newer.
When no CAL is needed is explained in
Windows Server CAL: when you need client access licenses.
Component 4: RDS CALs
If employees work in Remote Desktop sessions, they additionally need one RDS CAL per user or device. This is a separate item alongside the Windows Server CAL. A terminal server therefore doubles the number of client access licenses for the employees concerned. Details in
RDS CAL: licensing Remote Desktop Services.
What is often overlooked
- A version change is a new purchase. Microsoft points out that every new Windows Server version requires its own license. The CALs must then match the new version as well.
- The lifetime counts too. A version with long support spreads the expense over more years. The dates are in Windows Server end of support: all versions.
- Other server products have their own licenses. SQL Server or Exchange Server need their own server licenses and client access licenses, see Licensing SQL Server: core or CAL.
- Very small businesses may get by with Essentials, which works without CALs: Windows Server 2025 Essentials.
Three sample calculations in license quantities
Office with 10 employees. One server with one processor and 8 cores, two VMs. Result: 1 Windows Server Standard base license (16 cores) and 10 user CALs.
Host with two processors and four VMs, 25 employees. Two processors of 8 cores each. Result with Standard: 32 core licenses and 25 user CALs. Result with Datacenter: 16 core licenses and 25 user CALs. The calculator shows which edition gives the smaller total at current prices.
Terminal server for 25 employees. One processor with 16 cores, two VMs. Result: 1 Standard base license, 25 user CALs and 25 RDS user CALs.
Enter the same values in the license calculator: it gives the same quantities and, in addition, the total at current prices.
At VivaKeys
- Server licenses: Windows Server 2025 Standard, 16 Core, Standard Core Add-on, Windows Server 2025 Datacenter, Datacenter Core Add-on
- Client access licenses: Windows Server 2025 User CAL, Device CAL, RDS 2025 User CAL
- For small businesses: Windows Server 2025 Essentials
All offers with current prices are in the categories
Windows Server and
CALs. For companies, public authorities and system integrators, we prepare a written quote on request, also for servers and CALs together. Just tell us the products and quantities via the contact form.
Frequently asked questions
What does a Windows Server license cost? That depends on the edition, the core count and the number of CALs. The smallest combination is one Standard base license for 16 cores and one CAL per user or device. The license calculator gives the current total for your details.
What does Windows Server 2025 Standard cost compared with Datacenter? Datacenter costs more per core license but, with many virtual machines, saves you licensing several times over. With one or two VMs, Standard is the smaller bill.
Are CALs included in the price of Windows Server? No. The server license and the CALs are separate licenses. You buy CALs in addition, in the quantity of your users or devices.
What do RDS CALs cost in addition? RDS CALs are a separate item per user or device and are added to the Windows Server CAL. You only need them for people or devices that use Remote Desktop sessions.
Is a license for 16 cores cheaper if my server has only 8 cores? No. 16 core licenses are the minimum quantity per server. The licensing model does not provide for smaller quantities.
Can I get a quote for several licenses? Yes. For larger quantities we prepare a written quote with tiered prices. Send us the products, quantity and company via the
contact form.
Sources
Checked on 2026-11-10 against the publisher’s information:
- www.microsoft.com/licensing/guidance/Windows-Server-2025
- www.microsoft.com/licensing/terms/productoffering/WindowsServerStandardDatacenterEssentials/EAEAS
- www.microsoft.com/en-us/licensing/product-licensing/windows-server
- www.microsoft.com/en-us/licensing/product-licensing/client-access-license
- learn.microsoft.com/en-us/windows-server/get-started/upgrade-overview