Forecast Accuracy Rate (Spend)
Definition
This metric compares forecasted vs. actual cloud spend over a specific period (e.g., day, month, quarter). While percentage variance is the primary metric, dollar differences can also be informative. Each organization defines its acceptable variance.
Formula, as published
((Forecasted Public Cloud Spend - Actual Public Cloud Spend) / Forecasted Public Cloud Spend)
- Data sources:
- CSP Billing Data Organizational forecast documents
Calculate it
Example values to start with; replace them with yours.
How to measure it
As published the result is signed: positive when actual spend came in under the forecast. Averaged across months, signed errors cancel out, so average the absolute errors when you track it over a year.
Forecast at the level you are held to: an estate-wide forecast can be accurate while every team-level forecast inside it is wrong.
FOCUS columns: EffectiveCost, ChargePeriodStart
More Forecasting KPIs
Definition and formula: Forecast Accuracy Rate (Spend), 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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