Azure Hybrid Use Benefit Calculator
Estimate your monthly savings by using your on-premises Windows Server and SQL Server licenses with Software Assurance on Azure.
Savings Calculator
Windows Server AHB Savings: $0.00
SQL Server Enterprise AHB Savings: $0.00
SQL Server Standard AHB Savings: $0.00
Windows vCPUs Covered: 0
SQL Ent vCPUs Covered: 0
SQL Std vCPUs Covered: 0
| Component | vCPUs/Cores On-Prem (SA) | vCPUs in Azure | vCPUs Covered by AHB | Estimated Monthly Savings |
|---|---|---|---|---|
| Windows Server | 16 | 16 | 0 | $0.00 |
| SQL Server Enterprise | 8 | 8 | 0 | $0.00 |
| SQL Server Standard | 0 | 0 | 0 | $0.00 |
| Total Estimated Savings | $0.00 | |||
What is Azure Hybrid Use Benefit?
The Azure Hybrid Use Benefit (AHB) is a licensing benefit from Microsoft that helps you significantly reduce the costs of running your workloads in the Azure cloud. If you own on-premises Windows Server or SQL Server licenses with active Software Assurance (SA), you can use these licenses to pay a reduced rate (base compute rate) for Azure Virtual Machines (for Windows Server) and various Azure SQL services (like SQL Server on Azure VMs, Azure SQL Managed Instance, and Azure SQL Database).
Essentially, instead of paying the full price that includes the Windows Server or SQL Server license cost in Azure, you leverage your existing investment in on-premises licenses with SA to cover the software license portion in the cloud, paying only for the base infrastructure costs. The Azure Hybrid Use Benefit can lead to substantial savings, especially for compute-intensive workloads.
Who should use it?
Organizations that have already invested in Windows Server (Datacenter or Standard editions) or SQL Server (Enterprise or Standard editions) licenses with active Software Assurance are ideal candidates for the Azure Hybrid Use Benefit. It’s particularly beneficial when migrating existing on-premises workloads to Azure or deploying new ones while wanting to maximize the value of existing license agreements.
Common misconceptions:
- It’s automatic: You need to actively enable the Azure Hybrid Use Benefit for your Azure resources.
- It covers all Azure services: AHB primarily applies to Windows Server on Azure VMs, SQL Server on Azure VMs, Azure SQL Managed Instance, and Azure SQL Database, and Azure Stack HCI.
- Any license works: Only licenses with active Software Assurance are eligible for the Azure Hybrid Use Benefit.
- One license covers unlimited VMs: The number of vCPUs you can cover in Azure is related to the number of licensed cores you have on-premises (with specific rules for Standard vs. Datacenter editions).
Azure Hybrid Use Benefit Formula and Mathematical Explanation
The core idea is to calculate the savings by identifying how many Azure vCPUs can be covered by your on-premises licenses with SA and multiplying that by the cost difference between the pay-as-you-go rate (including license) and the base compute rate (without license).
Simplified Formulas:
Windows vCPUs Covered = min(Total Windows vCPUs in Azure, Total eligible on-prem Windows Server cores with SA)SQL Ent vCPUs Covered = min(Total SQL Ent vCPUs in Azure, Total eligible on-prem SQL Server Ent cores with SA)SQL Std vCPUs Covered = min(Total SQL Std vCPUs in Azure, Total eligible on-prem SQL Server Std cores with SA)Windows Savings = Windows vCPUs Covered * Hours * Windows AHB Saving RateSQL Ent Savings = SQL Ent vCPUs Covered * Hours * SQL Ent AHB Saving RateSQL Std Savings = SQL Std vCPUs Covered * Hours * SQL Std AHB Saving RateTotal Savings = Windows Savings + SQL Ent Savings + SQL Std Savings
Note: For Windows Server Datacenter edition with SA, you get dual-use rights (use on-premises AND in Azure simultaneously), while Standard edition licenses with SA used in Azure may have limitations on simultaneous on-premises use unless using specific migration rights. Our calculator uses a simplified approach where on-prem cores directly map to potential vCPUs covered, but Datacenter offers more flexibility.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| On-Prem Cores (SA) | Number of on-premises physical server cores licensed with active SA for Windows or SQL Server. | Cores | 0 – 1000s |
| Azure vCPUs | Total virtual CPUs used by your VMs in Azure for the specific workload (Windows, SQL Ent, SQL Std). | vCPUs | 0 – 1000s |
| Hours | Number of hours the Azure VMs run per month. | Hours | 1 – 744 |
| AHB Saving Rate | The cost difference per vCPU per hour between the pay-as-you-go rate (with license) and the base compute rate (using AHB). | $/vCPU/hour | $0.02 – $0.50+ |
Practical Examples (Real-World Use Cases)
Example 1: Migrating Windows Server Workloads
A company has 64 on-premises Windows Server Datacenter cores with Software Assurance. They plan to migrate workloads to Azure requiring 80 vCPUs for Windows Server VMs running 24/7 (730 hours/month). The estimated AHB saving rate for Windows Server is $0.05/vCPU/hour.
- On-Prem Win DC Cores: 64
- Azure Win vCPUs: 80
- Hours: 730
- Win AHB Saving Rate: $0.05
- Windows vCPUs Covered: min(80, 64) = 64
- Windows Savings: 64 * 730 * $0.05 = $2336 per month
By using the Azure Hybrid Use Benefit, the company saves an estimated $2336 monthly on their Windows Server VMs.
Example 2: SQL Server Consolidation in Azure
An organization has 32 SQL Server Enterprise cores and 16 SQL Server Standard cores with SA. They are moving to Azure with 30 vCPUs for SQL Enterprise VMs and 20 vCPUs for SQL Standard VMs, running 730 hours/month. Saving rates are $0.45 for Ent and $0.15 for Std.
- On-Prem SQL Ent Cores: 32
- On-Prem SQL Std Cores: 16
- Azure SQL Ent vCPUs: 30
- Azure SQL Std vCPUs: 20
- Hours: 730
- SQL Ent AHB Saving Rate: $0.45
- SQL Std AHB Saving Rate: $0.15
- SQL Ent vCPUs Covered: min(30, 32) = 30
- SQL Std vCPUs Covered: min(20, 16) = 16
- SQL Ent Savings: 30 * 730 * $0.45 = $9855
- SQL Std Savings: 16 * 730 * $0.15 = $1752
- Total SQL Savings: $9855 + $1752 = $11607 per month
The Azure Hybrid Use Benefit provides significant savings of $11607 monthly for their SQL workloads.
How to Use This Azure Hybrid Use Benefit Calculator
This calculator helps estimate your potential savings:
- Enter On-Premises Licenses: Input the number of physical cores you have licensed with active Software Assurance for Windows Server (Datacenter and Standard) and SQL Server (Enterprise and Standard).
- Enter Azure vCPU Requirements: Specify the total number of vCPUs your Azure VMs will use for Windows Server, SQL Server Enterprise, and SQL Server Standard workloads.
- Monthly Hours: Adjust the average number of hours your VMs run per month if different from the default 730 (24/7).
- Saving Rates: Input the estimated saving per vCPU per hour for each workload type by using AHB. These rates vary by region and VM type; consult Azure pricing for specifics (the difference between PAYG with license and base compute).
- Calculate: Click “Calculate Savings” to see the results.
- Review Results: The calculator will display the estimated total monthly savings, a breakdown by workload, and the number of vCPUs covered. The chart and table visualize the savings.
- Reset/Copy: Use “Reset” to clear and start over, or “Copy Results” to copy the key figures.
Use the results to understand the financial benefits of leveraging your existing licenses when moving to or deploying in Azure. Compare costs with and without the Azure Hybrid Use Benefit to make informed decisions.
Key Factors That Affect Azure Hybrid Use Benefit Results
- Number of On-Premises Licenses with SA: The more eligible cores you have with active Software Assurance, the more vCPUs you can potentially cover in Azure, increasing savings.
- Type of On-Premises Licenses: Windows Server Datacenter licenses offer more flexibility (dual-use rights) than Standard for AHB, potentially covering more Azure vCPUs relative to on-prem cores in certain scenarios. SQL Enterprise vs. Standard also have different saving rates.
- Number of vCPUs in Azure: The savings apply per vCPU, so the more vCPUs you run that are eligible and covered, the greater the savings from the Azure Hybrid Use Benefit.
- VM Uptime (Hours): Savings are calculated per hour, so VMs running 24/7 will see more savings than those running only part-time.
- Azure Region and VM Series: The actual saving rate per vCPU/hour (difference between PAYG with license and base compute) varies based on the Azure region and the specific VM series/size you choose.
- Software Assurance Status: The Azure Hybrid Use Benefit is only available for licenses with active Software Assurance. If SA expires, the benefit is lost for those licenses.
- License Mobility: Understanding License Mobility through Software Assurance is also crucial, especially for SQL Server, as it impacts how licenses can be assigned to shared hardware in the cloud.
- Microsoft Licensing Rules: The exact rules for how on-prem cores map to Azure vCPUs (e.g., minimums per VM, core-to-vCPU ratios) can be complex and should be reviewed in Microsoft’s official documentation.
Frequently Asked Questions (FAQ)
- What is Software Assurance (SA)?
- Software Assurance is a comprehensive maintenance program offered by Microsoft that provides various benefits, including new software versions, support, and unique licensing rights like the Azure Hybrid Use Benefit.
- Can I use Azure Hybrid Use Benefit for existing Azure VMs?
- Yes, you can apply the Azure Hybrid Use Benefit to existing VMs running Windows Server or SQL Server, provided you have eligible licenses with SA. You may need to update the VM’s licensing setting.
- Do I need to cover all my Azure vCPUs with on-prem licenses?
- No, you can use the Azure Hybrid Use Benefit for as many vCPUs as your eligible on-prem licenses allow. For any remaining vCPUs, you would pay the standard pay-as-you-go rate that includes the license cost.
- What happens if my Software Assurance expires?
- If your SA expires, you lose the eligibility for the Azure Hybrid Use Benefit for those licenses. You would then need to pay the standard Azure rates or renew your SA.
- Can I use Windows Server Standard licenses for Azure Hybrid Use Benefit?
- Yes, Windows Server Standard licenses with SA are eligible. However, Datacenter edition licenses often provide greater value and flexibility with AHB, including dual-use rights for simultaneous on-prem and Azure use of the license.
- Is Azure Hybrid Use Benefit available for SQL PaaS services?
- Yes, the Azure Hybrid Use Benefit is available for Azure SQL Database and Azure SQL Managed Instance, not just SQL Server on Azure VMs.
- How do I activate the Azure Hybrid Use Benefit?
- Activation varies. For VMs, it’s often a checkbox during deployment or a setting change post-deployment in the Azure portal or via PowerShell/CLI. For SQL PaaS, it’s selected during service configuration.
- Where do I find the exact saving rates?
- The saving rates used in the calculator are estimates. For precise figures, check the Azure pricing page for the specific VM series/size and region, and compare the price with and without the Azure Hybrid Use Benefit.