Effective Savings Rate Percentage
Definition
Return on investment metric of all commitment discounts by commitmentDiscountId / commitmentDiscountName, commitmentDiscountStatus, commitmentDiscountType, etc..
Formula, as published
Option 1: (CB Discount Savings - Cost to achieve CB Discount Savings) / Compute On-Demand Equivalent Spend Option 2: 1 - (Actual Spend with Discounts / Equivalent Spend at On Demand Rate)
- Data sources:
- CSP Billing Data
Calculate it
Example values to start with; replace them with yours.
How to measure it
The one number for how well a commitment portfolio works: it rises with coverage and falls with every dollar of unused commitment, so buying too much shows up as clearly as buying too little.
Two things skew it. Measured over the whole bill, storage, data transfer and tax dilute it, so measure it over the usage commitments can cover. And commitment purchases must be amortized: an upfront payment counted in the month it was paid makes that month look terrible and the next eleven look too good.
FOCUS columns: ContractedCost, EffectiveCost, CommitmentDiscountStatus, CommitmentProgramEligibilityDetails
Coverage, utilization, effective savings rate and what expires next, from your own bill.
From the FinOps Foundation
More Rate Optimization KPIs
Definition and formula: Effective Savings Rate Percentage, FinOps KPI library, FinOps Foundation, licensed CC BY 4.0, read 16 Oct 2026. Changed: HTML removed, dashes and British spellings changed, formula split from its data sources and examples. The calculator and the notes are Finitizer’s.
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