| Annual difference | — |
|---|
| Lower-cost decision | — |
|---|
Calculation guidance will appear here.
How This Is Calculated
This calculator compares total cost of making a component/product in-house (variable cost per unit × volume, plus fixed costs and opportunity cost) against buying it externally (purchase price plus logistics, plus any transition/risk cost) — the lower total cost indicates the more economical choice, though qualitative factors (quality control, strategic control, supply reliability) matter too and aren't captured in a pure cost comparison.
Frequently Asked Questions
Should the make-or-buy decision be based on cost alone?
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Cost is a major factor but not the only one — quality control, supply chain reliability, strategic importance of the capability, and flexibility to scale up or down are qualitative factors that a pure cost comparison doesn't capture, and can sometimes outweigh a modest cost difference.
What is "opportunity cost" in the make decision?
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The value of what else the resources used to make the component in-house could have been used for instead — including this cost prevents understating the true cost of the "make" option by only counting direct out-of-pocket costs.
Related guidance: No-Cost EMI: What Buyers Should Check Before Clicking Buy | Finin2min · Product Development Cost: Expense vs Capitalise Decision Under AS 26 | Finin2min
Finin2min decision laboratory
Make-or-Buy: Capacity and Relevant Cost Planner
Model avoidable fixed cost, opportunity cost, purchased unit landed cost and annual capacity. Exclude sunk and unavoidable costs.
Enter assumptions and select Calculate.
Educational modelling only. Verify qualitative factors, assumptions, current tax treatment and cash-flow dates independently. Legacy calculator remains available on this page.
Methodology, assumptions and sources
Scope: Compares the cost of manufacturing a component in-house ('make') against purchasing it from an outside supplier ('buy'), based on relevant (differential) costs only.
Calculation logic
- Make cost = (Variable cost per unit × Quantity) + any additional fixed cost that is specifically incurred only if making (e.g., new equipment), excluding fixed costs that would be incurred regardless of the decision.
- Buy cost = Purchase price per unit × Quantity + any additional handling/incoming-inspection cost entered.
- Compare total Make cost against total Buy cost at the entered quantity, and compute the break-even quantity at which the two options cost the same.
Inputs and assumptions
- Only relevant (differential/incremental) costs are included per standard make-or-buy analysis convention — sunk costs and costs unaffected by the decision are excluded by design.
- Assumes the supplier's quoted buy price is stable at the volume entered; volume-discount tiers are only reflected if the user re-runs the calculation at each tier.
Exclusions and edge cases
- Does not model qualitative factors (supplier reliability, quality control, strategic capability retention) that typically also inform a real make-or-buy decision — this is the quantitative cost component only.
- Capacity/opportunity cost of using in-house production capacity for this component instead of another product is not automatically included unless entered.
Sources
No external regulatory source applies — this is a general financial formula, not a statutory computation.
Review status: reviewed and approved by CA Nikhil Gupta on 18 July 2026.