Business decision tool
Make-or-Buy Cost Comparison Calculator
Compare in-house fixed and variable costs with an external supplier price.
Inputs and results stay in this browser. Currency symbols are illustrative; use any consistent currency.
Understand Make or buy
One idea, three depths
Choose how deeply to explain Make or buy
Make or buy: Compare in-house fixed and variable costs with an external supplier price.
Age 5Explain it to a 5-year-oldStart with a picture
Imagine using Make or buy to answer this question: compare in-house fixed and variable costs with an external supplier price? Enter Required units, Avoidable fixed make cost, Variable make cost per unit, and 1 other input; the calculator shows In-house make cost. Try changing one number and watch what happens to In-house make cost. The answer tells you In-house make cost.
Age 15Explain it to a 15-year-oldConnect it to the formula
Only avoidable costs belong in the financial comparison. Quality, lead time, intellectual property, resilience and internal capacity can outweigh a small cost difference. The rule is Make cost = fixed cost + units × variable make cost; buy cost = units × supplier price. Its input values are Required units, Avoidable fixed make cost, Variable make cost per unit, Supplier price per unit, and the main result is In-house make cost. Try changing one number and watch what happens to In-house make cost.
CollegeExplain it at college levelState the model precisely
This tool models one operating decision from explicitly supplied company assumptions. The implemented relation is Make cost = fixed cost + units × variable make cost; buy cost = units × supplier price, evaluated from Required units, Avoidable fixed make cost, Variable make cost per unit, Supplier price per unit to produce In-house make cost. Only avoidable costs belong in the financial comparison. Quality, lead time, intellectual property, resilience and internal capacity can outweigh a small cost difference. 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
Compare in-house fixed and variable costs with an external supplier price.
Why the business model works
Only avoidable costs belong in the financial comparison. Quality, lead time, intellectual property, resilience and internal capacity can outweigh a small cost difference.
Inputs and operating assumptions
This model uses Required units (at least 0), Avoidable fixed make cost (at least 0), Variable make cost per unit (at least 0), Supplier price per unit (at least 0). Keep currencies, accounting treatment and time periods consistent with one another.
The formula
Make cost = fixed cost + units × variable make cost; buy cost = units × supplier price
What the calculator produces
The primary output is In-house make cost; it also exposes External buy cost, Make minus buy, Cost break-even quantity. 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). Make-or-Buy Cost Comparison Calculator. MW SysArc Tools. https://business.mwsysarc.com/make-or-buy-comparison
MLA 9
MW SysArc. “Make-or-Buy Cost Comparison Calculator.” MW SysArc Tools, 21 July 2026, https://business.mwsysarc.com/make-or-buy-comparison. Accessed 30 Aug. 2026.
Chicago 17
MW SysArc. “Make-or-Buy Cost Comparison Calculator.” MW SysArc Tools. Published July 21, 2026. Accessed August 30, 2026. https://business.mwsysarc.com/make-or-buy-comparison.
Harvard
MW SysArc (2026) ‘Make-or-Buy Cost Comparison Calculator’, MW SysArc Tools. Published 21 July 2026. Available at: https://business.mwsysarc.com/make-or-buy-comparison (Accessed: 30 August 2026).
BibTeX and RIS records
BibTeX
@misc{mwsysarc_make_or_buy_2026,
author = {{MW SysArc}},
title = {Make-or-Buy Cost Comparison Calculator},
howpublished = {MW SysArc Tools},
year = {2026},
url = {https://business.mwsysarc.com/make-or-buy-comparison},
note = {Published July 21, 2026; accessed August 30, 2026}
}RIS
TY - ELEC
AU - MW SysArc
TI - Make-or-Buy Cost Comparison Calculator
T2 - MW SysArc Tools
PY - 2026
DA - 2026-07-21
Y2 - 2026-08-30
UR - https://business.mwsysarc.com/make-or-buy-comparison
N1 - Published July 21, 2026
ER -Clear answers
Frequently asked questions
What does the Make or buy do?
Compare in-house fixed and variable costs with an external supplier price.
How does the Make or buy work?
The calculator applies Make cost = fixed cost + units × variable make cost; buy cost = units × supplier price. Only avoidable costs belong in the financial comparison. Quality, lead time, intellectual property, resilience and internal capacity can outweigh a small cost difference.
What can I learn from the Make or buy?
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 .