What's changed: Revamped AZ-900 Chapter 5 to the new depth (cost factors/tools/savings, Policy/locks/RBAC/Purview/landing zones)
5.1Cost Management
Understand what drives cloud cost and the tools to manage it: estimating (Pricing Calculator / TCO Calculator), tracking actual spend (Microsoft Cost Management), and organizing (tags).
The cloud is pay-as-you-go, yet cost varies a lot with your design. The key to control is thinking in three phases: estimate before you build, track while running, and organize and save. First understand what drives cost, then use the right tool for each phase.
5.1.1What drives cost
| Factor | Explanation | Saving tip |
|---|---|---|
| Resource type/size | VM size, storage type, etc. | Right-size |
| Region | Prices differ by region | Pick a cheaper/near region |
| Uptime/usage | Running time, requests, stored volume | Stop idle resources |
| Data transfer (egress) | Outbound is commonly billed | Reduce/optimize transfer |
| Licensing | OS/software license cost | Use Azure Hybrid Benefit |
5.1.2Tools to estimate, track, and organize
Cost tools split by "when you use them." The Pricing Calculator estimates the price of a not-yet-built configuration, and the TCO Calculator compares "own vs cloud" total cost of ownership when migrating from on-premises—both are for before you build. By contrast, Microsoft Cost Management visualizes and analyzes the actual spend of a running environment and alerts on budget overruns. And tags classify cost across resources.
| Tool | Purpose | When |
|---|---|---|
| Pricing Calculator | Estimate a configuration price | Before building |
| TCO Calculator | Compare on-prem vs cloud TCO | When planning migration |
| Microsoft Cost Management | Track/analyze actual spend, budgets/alerts | While running |
| Tags | Organize cost by dept/project | Ongoing |
5.1.3Ways to save
- Reservations (Reserved Instances / Savings Plans): commit to 1–3 years for large discounts.
- Spot: use spare capacity cheaply (can be evicted; good for batch).
- Azure Hybrid Benefit: bring existing Windows/SQL licenses for a discount.
- Autoscale, right-size, and stop: match capacity to demand and avoid waste.
Scenario: cutting dev-environment cost. Dev VMs are idle at night/weekends, so auto-stop them (less uptime). Always-on production VMs get a reservation discount. Split cost with tags (env=dev/prod) and alert on overruns via a Cost Management budget, reconciling against the upfront Pricing Calculator estimate.
Watch the mix-ups: (1) Pricing Calculator (future = estimate) vs Cost Management (actual = tracking). (2) TCO Calculator is specifically the on-prem comparison for migration. (3) Reservations/Spot/Hybrid Benefit are saving levers, distinct from the estimate/track tools.
Q. Are tags only for cost? No. Tags help cost reporting but are general-purpose labels also used for operations, automation, and governance (required tags can be enforced via Azure Policy). Cost is one prominent use.
Common points: Pricing Calculator = pre-build estimate / TCO Calculator = on-prem comparison / Cost Management = actual spend & budgets / tags = organize cost, and saving = reservations/spot/Hybrid Benefit/stop & right-size. Do not confuse "future estimate" with "tracking actual spend."
5.1.4Section summary
- Cost factors: type, size, region, uptime, data transfer (egress), licensing
- Pricing Calculator (estimate) / TCO Calculator (on-prem comparison) / Cost Management (actual & budgets) / tags (organize)
- Save with reservations, spot, Azure Hybrid Benefit, and stopping/right-sizing/region choice
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Quick check
(just a quick review)Q1. Which tool compares total cost of ownership (TCO) between on-premises and the cloud?
Q2. Which service tracks/analyzes actual spend and sets budgets and alerts?
Q3. Which lets you attach named labels to resources to organize cost by department/project?
Q4. Which gives a large discount in exchange for committing to 1–3 years of use?
Q5. Which tool estimates the price of a configuration you have not built yet?
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