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Budget & Cost Management

Estimate to Complete (ETC)

Estimate of the remaining cost required to complete the project. It is most useful as a repeatable operating measure, with the same scope and cut-off applied each time.

Business context

Why Estimate to Complete matters

Read Estimate to Complete alongside the operational drivers that feed the formula. A better-looking result may come from a population change rather than a real improvement.

Business question
Is the latest Estimate to Complete result caused by performance, mix, timing, or measurement changes?
Teams that use it
Project managers, delivery leads, finance, operations, and project sponsors.
Decisions it supports
Schedule recovery, budget control, scope choices, staffing, and delivery-risk management.
Calculation

Estimate to Complete formula

(Planned Budget - EV) ÷ CPI

Formula components

Planned Budget
The monetary amount assigned to planned budget for the same scope and reporting period used by Estimate to Complete.
CPI
The consistently counted cpi included in the metric’s documented population and period.
Reporting period
The consistent day, week, month, quarter, or year covered by every input.

How to calculate Estimate to Complete

  1. Define the business scope, reporting period, and the event or status that qualifies for Estimate to Complete.
  2. Collect each input in the workbook formula from systems that use the same cut-off and unit.
  3. Remove duplicates and exclusions according to the documented rule, while retaining a reconciliation count.
  4. Apply (Planned Budget - EV) ÷ CPI and label the result with its period, unit, and relevant segment.
Worked example

Estimate to Complete example

A fictional team uses one scope and period for every Estimate to Complete input.

  1. Planned Budget = £120,000; CPI = £100,000.
  2. CPI = £100,000.
  3. Estimate to Complete = (£120,000 − £100,000) ÷ £100,000 = £0.2.

Estimate to Complete is £0.2.

The calculation preserves the workbook order: first take the difference, then divide by the stated comparison base.

How to interpret the result

Compare Estimate to Complete over a consistent cadence and break it down only by segments large enough to support a decision. Review the formula inputs beside the result so teams can distinguish a real operating shift from a denominator or mix effect.

There is no single target that fits every organisation. Interpretation depends on project type, delivery method, scope, complexity, team capacity, and reporting date. Document the comparison group before labelling a result strong or weak.

Common mistakes and limitations

Inconsistent scope
Changing the included business units, products, channels, or populations makes the trend look different even when underlying performance is unchanged.
Mismatched periods
Formula inputs from different cut-off dates or time windows do not describe one coherent result.
Reading the headline alone
A single value can hide offsetting movement across segments, volumes, or contributing formula components.
Assuming one universal target
A useful comparison depends on project type, delivery method, scope, complexity, team capacity, and reporting date; use like-for-like internal trends and clearly documented peer groups.
To-Complete Performance Index (TCPI) Forecasts the cost efficiency required to complete the project within the budget. Earned Value (EV) Represents the value of work completed relative to the planned schedule and cost. Cost Overrun Percentage Percentage by which actual costs exceed the original budget. Budget Variance Measures the difference between the planned budget and actual project expenses.

Turn metric definitions into answers your team can use.

Vizma helps teams understand and track business metrics using their data. Bring your Estimate to Complete definition, underlying data, and reporting questions to a Vizma demo.

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