Infrastructure Cost Estimation

Introduction

This rulebook defines a technology-agnostic methodology for creating accurate monthly infrastructure cost estimates, ensuring reliable budgeting through:

• Systematic resource discovery via IaC analysis and live environment enumeration

• Authoritative, up-to-date pricing research

• Credit exclusion for true cost visibility

• Consistent, reproducible calculation practices

Goal

Why did we make this rule book?

• To avoid inaccurate cost forecasts caused by credits, discounts, or outdated pricing.

• To ensure consistent, transparent cost estimation across cloud providers.

• To eliminate incomplete analysis by covering all resources and environments.

What will you achieve?

• Accurate gross and net monthly infrastructure cost estimates.

• Clear, repeatable workflows for cost analysis and validation.

• Better budgeting decisions and reduced financial risk post-credits.

Who is this for?

Anyone who wants to perform accurate, consistent, and reliable cloud infrastructure cost estimation, regardless of platform or technology.

Workflow

This methodology follows a standardized process to estimate infrastructure costs accurately and consistently across cloud providers.

1. Exclude Credits First: Remove credits, promotional offers, and discounts to reveal true gross costs.

2. Native Cost Estimation: Use official cloud provider tools with proper filters to calculate gross and net costs.

3. Resource Discovery: Identify all infrastructure components through IaC analysis, live queries, and API enumeration.

4. Pricing Research: Gather region-specific pay-as-you-go rates from official provider pricing pages.

5. Python Calculations: Perform all numeric operations in Python for precision and reproducibility.

6. Validate Results: Compare native tool gross costs with calculated costs, documenting any differences and assumptions.

7. Document Findings: Record the full analysis, resource inventory, pricing sources, and calculation scripts.

Use Cases

Cloud Cost Forecasting

Generate accurate cost projections without being skewed by temporary credits or discounts.

Post-Credit Budget Planning

Plan for ongoing operational costs after promotional credits expire.

Multi-Cloud Cost Comparison

Compare true infrastructure costs across AWS, Azure, and Google Cloud using standard pricing.

FinOps Reporting

Produce transparent, reproducible cost breakdowns for finance, operations, and leadership teams.

Optimization Impact Validation

Measure and confirm savings from infrastructure or workload optimizations using a consistent methodology.

References

• AWS Cost Explorer Documentation

• Azure Cost Management + Billing Documentation

• Google Cloud Billing Documentation