Business decision tool
Sunk Cost Decision Calculator
Evaluate a forward-looking decision using future benefits and avoidable future costs while separating sunk cost.
Inputs and results stay in this browser. Currency symbols are illustrative; use any consistent currency.
Continue under the incremental-cost rule
Understand Sunk cost decision
One idea, three depths
Choose how deeply to explain Sunk cost decision
Sunk cost decision: Evaluate a forward-looking decision using future benefits and avoidable future costs while separating sunk cost.
Age 5Explain it to a 5-year-oldStart with a picture
Imagine using Sunk cost decision to answer this question: evaluate a forward-looking decision using future benefits and avoidable future costs while separating sunk cost? Enter Expected future benefit, Avoidable future cost, Already-incurred sunk cost; the calculator shows Forward-looking net benefit. For example: After $50,000 is already sunk, a project with $40,000 future benefit and $30,000 future cost has a positive $10,000 forward-looking net benefit. The answer tells you Forward-looking net benefit.
Age 15Explain it to a 15-year-oldConnect it to the formula
A cost already incurred and unrecoverable should not change the continue-or-stop decision. It remains relevant for accounting history, but not for incremental choice. The rule is Forward-looking net benefit = Future benefit − Avoidable future cost; sunk cost is excluded. Its input values are Expected future benefit, Avoidable future cost, Already-incurred sunk cost, and the main result is Forward-looking net benefit. For example: After $50,000 is already sunk, a project with $40,000 future benefit and $30,000 future cost has a positive $10,000 forward-looking net benefit.
CollegeExplain it at college levelState the model precisely
This tool models one operating decision from explicitly supplied company assumptions. The implemented relation is Forward-looking net benefit = Future benefit − Avoidable future cost; sunk cost is excluded, evaluated from Expected future benefit, Avoidable future cost, Already-incurred sunk cost to produce Forward-looking net benefit. A cost already incurred and unrecoverable should not change the continue-or-stop decision. It remains relevant for accounting history, but not for incremental choice. 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
Evaluate a forward-looking decision using future benefits and avoidable future costs while separating sunk cost.
Why the business model works
A cost already incurred and unrecoverable should not change the continue-or-stop decision. It remains relevant for accounting history, but not for incremental choice.
Inputs and operating assumptions
This model uses Expected future benefit, Avoidable future cost (at least 0), Already-incurred sunk cost (at least 0). Keep currencies, accounting treatment and time periods consistent with one another.
The formula
Forward-looking net benefit = Future benefit − Avoidable future cost; sunk cost is excluded
What the calculator produces
The primary output is Forward-looking net benefit; it also exposes Sunk cost excluded from decision, Total accounting outlay if continued. Change one assumption at a time so the comparison remains explainable.
A worked business case
After $50,000 is already sunk, a project with $40,000 future benefit and $30,000 future cost has a positive $10,000 forward-looking net benefit.
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). Sunk Cost Decision Calculator. MW SysArc Tools. https://business.mwsysarc.com/sunk-cost-decision
MLA 9
MW SysArc. “Sunk Cost Decision Calculator.” MW SysArc Tools, 21 July 2026, https://business.mwsysarc.com/sunk-cost-decision. Accessed 31 Aug. 2026.
Chicago 17
MW SysArc. “Sunk Cost Decision Calculator.” MW SysArc Tools. Published July 21, 2026. Accessed August 31, 2026. https://business.mwsysarc.com/sunk-cost-decision.
Harvard
MW SysArc (2026) ‘Sunk Cost Decision Calculator’, MW SysArc Tools. Published 21 July 2026. Available at: https://business.mwsysarc.com/sunk-cost-decision (Accessed: 31 August 2026).
BibTeX and RIS records
BibTeX
@misc{mwsysarc_sunk_cost_decision_2026,
author = {{MW SysArc}},
title = {Sunk Cost Decision Calculator},
howpublished = {MW SysArc Tools},
year = {2026},
url = {https://business.mwsysarc.com/sunk-cost-decision},
note = {Published July 21, 2026; accessed August 31, 2026}
}RIS
TY - ELEC
AU - MW SysArc
TI - Sunk Cost Decision Calculator
T2 - MW SysArc Tools
PY - 2026
DA - 2026-07-21
Y2 - 2026-08-31
UR - https://business.mwsysarc.com/sunk-cost-decision
N1 - Published July 21, 2026
ER -Clear answers
Frequently asked questions
What does the Sunk cost decision do?
Evaluate a forward-looking decision using future benefits and avoidable future costs while separating sunk cost.
How does the Sunk cost decision work?
The calculator applies Forward-looking net benefit = Future benefit − Avoidable future cost; sunk cost is excluded. A cost already incurred and unrecoverable should not change the continue-or-stop decision. It remains relevant for accounting history, but not for incremental choice.
What can I learn from the Sunk cost decision?
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 .