How Azure Pricing Works

Azure uses a pay-as-you-go (PAYG) pricing model: you pay only for the cloud resources you consume, with no upfront capital commitment and no minimum term. This is called OpEx (operational expenditure) as opposed to the traditional CapEx (capital expenditure) model of buying and owning servers. You are billed monthly based on your actual metered resource usage.

Azure resource costs are determined by several factors. Resource type and configuration — a 64-core VM costs far more than a 2-core VM. Region — prices vary by Azure region due to local energy, labour, and datacentre costs. Bandwidth — inbound data transfer to Azure is generally free; outbound transfer is charged per GB. Consumption level — some services like Azure Functions charge per execution; others like VMs charge per hour of uptime.

The default pay-as-you-go rate is the most flexible: you provision resources and pay hourly or per-second with no commitment. Reserved Instances commit to a one- or three-year term for a specific VM family or database tier, delivering discounts of up to 72% compared to PAYG. Reserved Instances are ideal for stable, predictable workloads where you can confidently plan one to three years ahead.

Spot VMs (Azure Spot Virtual Machines) let you take advantage of unused Azure capacity at discounts of up to 90% off PAYG prices. The trade-off is that Azure can evict your Spot VM with only 30 seconds notice when it needs the capacity back. Spot VMs are ideal for stateless, fault-tolerant, and interruption-tolerant workloads: batch processing, rendering, large-scale simulations, and CI/CD build agents.

Azure Savings Plans for compute offer discounts of up to 65% on pay-as-you-go prices in exchange for a commitment to spend a specific dollar amount per hour for one or three years. Unlike Reserved Instances, Savings Plans are flexible — they apply across any VM series, size, region, or OS, automatically optimising savings as your workload composition changes. This makes them better suited to dynamic cloud environments.

Azure offers both an Azure Free Account (12 months of select free services, 55+ always-free services, and a USD 200 credit for the first 30 days) and permanently always-free services within usage limits. Always-free examples include Azure Functions (1 million executions/month), Azure Blob Storage (5 GB/month), Azure DevOps (5 users with unlimited private repos), and many more. Free tier limits reset monthly.

The shift from on-premises to cloud changes how IT spending appears on financial statements. CapEx is upfront investment in hardware that is depreciated over years — it ties up capital and requires forecasting years ahead. OpEx is operational spending billed as you consume services — it appears as a recurring expense and can be scaled up or down immediately. Cloud's OpEx model gives finance teams predictable monthly invoices and eliminates asset depreciation accounting.

Azure billing granularity varies by service. Virtual Machines are billed per-second from when they start to when they are stopped/deallocated (not just shut down — a stopped but allocated VM still accrues compute charges). Azure Functions on the Consumption Plan bill per execution and per GB-second of memory. Azure SQL Database bills per virtual core-hour. Understanding billing granularity prevents surprise charges.

Network bandwidth costs are often overlooked in cloud cost estimates. Key rules for Azure: Inbound data transfer (into Azure) is free. Data transfer within the same Azure region is free. Outbound data transfer (from Azure to the internet) is charged per GB, with the first 100 GB/month free for most services. Cross-region data transfer within Azure is also charged per GB. These costs add up significantly for data-intensive applications.

Azure Hybrid Benefit is a licensing offer that lets you reuse on-premises Windows Server and SQL Server licences with Software Assurance on Azure VMs or Azure SQL Database/Managed Instance. By applying the benefit, you pay only the base compute cost rather than the bundled OS/database licence cost — savings of up to 40% on Windows VMs and up to 85% when combining Hybrid Benefit with Reserved Instances on SQL.

Azure offers Dev/Test pricing through Azure subscriptions linked to Visual Studio subscriptions. Dev/Test pricing removes the Windows Server and SQL Server OS licence charges on VMs used for development and testing environments, effectively making these resources significantly cheaper. Dev/Test subscriptions also provide access to specific dev/test images not available in production subscriptions. These resources must not be used to run production workloads.

Test your understanding of Microsoft Azure Fundamentals (AZ-900) concepts from this lesson.

In this lesson you learned: Azure uses a pay-as-you-go OpEx model where costs depend on resource type, region, and consumption, Reserved Instances and Savings Plans offer up to 72-65% discounts for predictable workloads, and Azure Hybrid Benefit reuses existing Windows Server and SQL Server licences to reduce Azure bills. Next up we explore the Azure Pricing Calculator and TCO Calculator tools.