Budget at Completion Calculator
Budget at completion calculator works out Budget at completion (BAC) and Components summed from Approved budget components. The default figures on this page give budget at completion (BAC) of 600.00; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
2 steps
- Budget at completion is the sum of the approved budget components.
- BAC = 100 + 200 + 300 = 600.
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
3 sources
Keep this result
Save it, change one figure, then compare the two
The calculation stays free. Save this scenario, adjust one assumption, save that too, and put them side by side to see exactly what the change costs you. A free account keeps 5 scenarios and 2 comparisons; Personal makes both unlimited and adds exports and private links. Nothing is saved unless you press Save.
What the budget at completion calculator calculates
Sums the approved budget components into a budget at completion, and from a budget, an earned value and an actual cost computes the full earned value set: CV, SV, CPI, SPI, EAC by four methods, ETC, VAC and TCPI.
How to use this budget at completion calculator
Enter Approved budget components. Budget at completion (BAC) updates as you type. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Budget at completion (BAC), Components summed and Planned value (PV).
The method follows Project Management Institute, A Guide to the Project Management Body of Knowledge (PMBOK Guide), Control Costs - earned value analysis, forecasting and the to-complete performance index, Project Management Institute, The Standard for Earned Value Management and US Department of Defense, Earned Value Management Implementation Guide (EVMIG), appendix on EVM metric definitions.
What you can compare
Change one input at a time to see how it affects Budget at completion (BAC), Components summed and Planned value (PV). The inputs you can vary are Approved budget components.
Understanding Budget at completion (BAC), Components summed and Planned value (PV)
Earned value measures what a schedule and a cost account already say. It is only as good as the percent-complete figures fed into it, and a single-period index is a weak forecast on its own.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How to find budget at completion?
Sums the approved budget components into a budget at completion, and from a budget, an earned value and an actual cost computes the full earned value set: CV, SV, CPI, SPI, EAC by four methods, ETC, VAC and TCPI. Open “How this is worked out” beside the result to see each step for your own figures.
How to calculate the estimate at completion?
It needs Approved budget components. Nothing else is required, and the figures stay in your browser.
What is the difference between a budget at completion and an estimate at completion?
On the figures this page opens with, the budget at completion (BAC) is 600. No single number fits everyone: it follows Approved budget components, so enter your own above and the answer updates as you type.
What information do I need for the budget at completion calculator?
You need Approved budget components. The page opens with default figures that give budget at completion (BAC) of 600.00, so you can see the scale before entering your own.
What does this budget at completion calculator show?
It shows Budget at completion (BAC), Components summed, Planned value (PV), Earned value (EV), Actual cost (AC), Cost variance (CV), Schedule variance (SV) and Cost performance index (CPI), with the working and any warnings for your entries.
Can I check how the budget at completion calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.