Business decision tool
Estimate at Completion Calculator
Forecast final project cost when current cost efficiency is expected to continue.
Inputs and results stay in this browser. Currency symbols are illustrative; use any consistent currency.
Understand Estimate at completion
One idea, three depths
Choose how deeply to explain Estimate at completion
Estimate at completion: Forecast final project cost when current cost efficiency is expected to continue.
Age 5Explain it to a 5-year-oldStart with a picture
Imagine using Estimate at completion to answer this question: forecast final project cost when current cost efficiency is expected to continue? Enter Budget at completion, Earned value to date, Actual cost to date; the calculator shows Forecast estimate at completion. Try changing one number and watch what happens to Forecast estimate at completion. The answer tells you Forecast estimate at completion.
Age 15Explain it to a 15-year-oldConnect it to the formula
This EAC method assumes current cost performance continues; use another forecast when remaining work will behave differently. The rule is Estimate at completion = budget at completion ÷ cost performance index. Its input values are Budget at completion, Earned value to date, Actual cost to date, and the main result is Forecast estimate at completion. Try changing one number and watch what happens to Forecast estimate at completion.
CollegeExplain it at college levelState the model precisely
This tool models one operating decision from explicitly supplied company assumptions. The implemented relation is Estimate at completion = budget at completion ÷ cost performance index, evaluated from Budget at completion, Earned value to date, Actual cost to date to produce Forecast estimate at completion. This EAC method assumes current cost performance continues; use another forecast when remaining work will behave differently. The model omits unentered taxes, cash timing, legal constraints and market uncertainty. Compare the output with company records and a downside scenario before committing resources.
The decision this tool supports
Forecast final project cost when current cost efficiency is expected to continue.
Why the business model works
This EAC method assumes current cost performance continues; use another forecast when remaining work will behave differently.
Inputs and operating assumptions
This model uses Budget at completion (at least 0), Earned value to date (at least 0.01), Actual cost to date (at least 0). Keep currencies, accounting treatment and time periods consistent with one another.
The formula
Estimate at completion = budget at completion ÷ cost performance index
What the calculator produces
The primary output is Forecast estimate at completion; it also exposes Forecast budget variance, Cost performance index. Change one assumption at a time so the comparison remains explainable.
Before using the result in a decision
This compact model cannot capture every tax, accounting, legal, market or operational condition. Compare the output with current company records, cash timing and the downside scenario before committing resources.
Supporting sourcesAcademic referencesPrimary standards, textbooks and complete citations
Standards, reading and academic references
Use the calculator as the worked interaction, then consult the primary standards and academic textbooks listed below. MW SysArc links to the original sources; the explanation on this page is original and does not reproduce them.
Introduction to Business 2e
Read the free OpenStax business textbookCite this book
- APA 7
- Gitman, L. J., McDaniel, C., Shah, A., Reece, M., Koffel, L., Talsma, B., & Hyatt, J. C. (2026). Introduction to business 2e. OpenStax. https://openstax.org/books/introduction-business-2e/pages/1-introduction
- MLA 9
- Gitman, Lawrence J., et al. Introduction to Business 2e. OpenStax, 2026, https://openstax.org/books/introduction-business-2e/pages/1-introduction.
- Chicago author-date
- Gitman, Lawrence J., Carl McDaniel, Amit Shah, Monique Reece, Linda Koffel, Bethann Talsma, and James C. Hyatt. 2026. Introduction to Business 2e. Houston, TX: OpenStax. https://openstax.org/books/introduction-business-2e/pages/1-introduction.
OpenStax entries are free to read online. Follow the licence shown on each linked source before redistributing or adapting its content.
Reuse the page responsiblyCite this pageAPA, MLA, Chicago, Harvard, BibTeX and RIS
These formats cite this calculator page itself. They are separate from the academic references above, which support the mathematical method and terminology.
APA 7
MW SysArc. (2026, July 21). Estimate at Completion Calculator. MW SysArc Tools. https://business.mwsysarc.com/estimate-at-completion
MLA 9
MW SysArc. “Estimate at Completion Calculator.” MW SysArc Tools, 21 July 2026, https://business.mwsysarc.com/estimate-at-completion. Accessed 30 Aug. 2026.
Chicago 17
MW SysArc. “Estimate at Completion Calculator.” MW SysArc Tools. Published July 21, 2026. Accessed August 30, 2026. https://business.mwsysarc.com/estimate-at-completion.
Harvard
MW SysArc (2026) ‘Estimate at Completion Calculator’, MW SysArc Tools. Published 21 July 2026. Available at: https://business.mwsysarc.com/estimate-at-completion (Accessed: 30 August 2026).
BibTeX and RIS records
BibTeX
@misc{mwsysarc_estimate_at_completion_business_2026,
author = {{MW SysArc}},
title = {Estimate at Completion Calculator},
howpublished = {MW SysArc Tools},
year = {2026},
url = {https://business.mwsysarc.com/estimate-at-completion},
note = {Published July 21, 2026; accessed August 30, 2026}
}RIS
TY - ELEC
AU - MW SysArc
TI - Estimate at Completion Calculator
T2 - MW SysArc Tools
PY - 2026
DA - 2026-07-21
Y2 - 2026-08-30
UR - https://business.mwsysarc.com/estimate-at-completion
N1 - Published July 21, 2026
ER -Clear answers
Frequently asked questions
What does the Estimate at completion do?
Forecast final project cost when current cost efficiency is expected to continue.
How does the Estimate at completion work?
The calculator applies Estimate at completion = budget at completion ÷ cost performance index. This EAC method assumes current cost performance continues; use another forecast when remaining work will behave differently.
What can I learn from the Estimate at completion?
It connects company inputs to a transparent business result. Change one value at a time to compare operating scenarios.
Does MW SysArc receive or store what I enter?
No. The calculation runs locally in your browser. MW SysArc does not receive or store your calculation inputs.
How should I use the result?
Use the result as a practical reference. Review the inputs, assumptions and stated limitations before relying on it.
Last reviewed . Calculations tested .