What is AWS Blended Cost?

Best Practices for AWS Blended Cost

• Use AWS Cost and Usage Reports (CUR) to compare Blended Cost with Unblended Cost for accurate financial analysis
• Apply tagging strategies to map usage back to specific teams, projects, or business units
• Use Blended Cost for internal chargeback, but not for precise billing or external reporting
• Combine with AWS Cost Explorer to identify cost anomalies and inefficiencies across accounts
• Regularly review consolidated AWS billing configurations to ensure all linked accounts are correctly grouped

Advantages of AWS Blended Cost

• Simplified cloud cost allocation: Provides a single average cost per usage type across all accounts
• Improved internal reporting: Makes it easier to distribute shared costs across teams or departments
• Consistency: Eliminates pricing variations caused by discounts or reservations at individual account level
• Better organizational visibility: Helps leadership understand overall infrastructure spending trends

How AWS Blended Cost Works

• AWS aggregates usage across all linked accounts in an AWS Organization
• It applies a weighted average cost for each service usage type (e.g., EC2 hours, S3 storage)
• The resulting blended rate is applied uniformly across all accounts for reporting purposes
• It differs from Unblended Cost, which shows the actual cost incurred per account based on discounts, reservations, or savings plans
• Blended Cost is generated automatically in AWS Cost and Usage Reports and Cost Explorer

Tips & Tricks for AWS Blended Cost

• Always compare Blended vs Unblended Cost to understand true savings from reservations and savings plans
• Use cost allocation tags alongside blended cost to avoid misleading interpretations
• Avoid relying solely on blended metrics for optimization decisions they can hide account-level inefficiencies
• Break down costs by service and region to get more actionable insights
• Use AWS Organizations with proper structure (dev, staging, prod) for clearer cloud cost distribution & cloud cost management
• Blended Cost is useful for finance teams, but engineering teams should still rely on Unblended Cost for cloud cost optimization decisions

FAQs

• Q1: What is AWS Blended Cost used for?

  It is mainly used for internal cost allocation across multiple AWS accounts under a consolidated billing family.

• Q2: How is Blended Cost different from Unblended Cost?

  Blended Cost averages usage costs across accounts, while Unblended Cost reflects the actual charges per account with discounts applied.

• Q3: Does Blended Cost affect my AWS bill?

  No. It is only a reporting metric and does not change actual billing amounts.

• Q4: When should I avoid using Blended Cost?

  Avoid it for detailed cost optimization or financial accounting, as it hides account-level pricing variations.

• Q5: Where can I view Blended Cost in AWS?

  You can view it in AWS Cost Explorer or AWS Cost and Usage Reports (CUR) under the billing and cost management console.