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TechnologyGenerated accuracy model review: 2026-05-06
Azure VM Monthly Cost Calculator accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Monthly cost = VM count * hourly VM rate * hours + VM count * disk GB * disk price + egress GB * egress price + fixed monthly charges.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- VM Count: 3
- Hourly VM Rate: 0.12 $/hr
- Monthly Runtime: 730 hr
- OS Disk Size: 128 GB/VM
- OS Disk Price: 0.08 $/GB-mo
- Data Disk Size: 512 GB/VM
- Data Disk Price: 0.05 $/GB-mo
- Monthly Egress: 250 GB
- Egress Price: 0.08 $/GB
- Fixed Monthly Charges: $50
Expected outputs
- Monthly Cost: $440.32
- Compute Cost: $262.80
- Disk Storage Cost: $107.52
- Annual Cost: $5,283.84
Known limitations
- This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
- Use the result as a planning estimate unless the calculator page states a stricter purpose.
Assumptions
- Pricing is flat and user-entered.
- Taxes, discounts, reservations, marketplace images, and region-specific tiers are not inferred.
- Inputs are not stored or transmitted.
Unit handling
- VM Count accepts numeric values.
- Hourly VM Rate accepts values in $/hr.
- Monthly Runtime accepts values in hr.
- OS Disk Size accepts values in GB/VM.
- OS Disk Price accepts values in $/GB-mo.
- Data Disk Size accepts values in GB/VM.
- Data Disk Price accepts values in $/GB-mo.
- Monthly Egress accepts values in GB.
- Egress Price accepts values in $/GB.
- Fixed Monthly Charges accepts values in $.
- Monthly Cost is displayed as currency.
- Compute Cost is displayed as currency.
- Disk Storage Cost is displayed as currency.
- Annual Cost is displayed as currency.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
- Currency outputs are displayed with standard US dollar formatting.
- Input precision follows configured step values where provided.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current azure-vm-monthly-cost-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Azure VM Monthly Cost Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.