| 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
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.