What is opportunity cost?

Opportunity cost is the value of the next best alternative you give up when making a decision. In finance, it's the return you could have earned from the best alternative investment compared to the one you chose.

How is opportunity cost calculated?

The calculator subtracts the return of your chosen option from the return of the best alternative. The result is the percentage of return you forgo by not choosing the alternative.

Can opportunity cost be negative?

Yes, if your chosen option's return is higher than the best alternative, the opportunity cost is negative, meaning you made a better choice than the alternative.

Finance

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Opportunity Cost Calculator.

Calculate opportunity cost from the next-best alternative.

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Opportunity cost

FAQs

How does the opportunity cost calculator work?

Enter the requested values to receive a deterministic result. No live market, tax, or jurisdiction data is inferred.

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Cite this calculator

Canonical URL: https://mathify.one/en/finance/opportunity-cost

Cite as: Mathify. (n.d.). Opportunity Cost Calculator. https://mathify.one/en/finance/opportunity-cost

Use Cases

Compare investment options

Evaluate whether your current investment is performing better than the best alternative you could have chosen.

Example: If your stock returned 8% and the best alternative bond returned 5%, opportunity cost is -3% (you gained 3% more).

Assess business decisions

Use the calculator to weigh the financial return of a business project against the next best use of your capital.

Example: A project returns 12% while the best alternative is 10%, so opportunity cost is -2%.

Frequently Asked Questions

What is opportunity cost?: Opportunity cost is the value of the next best alternative you give up when making a decision. In finance, it's the return you could have earned from the best alternative investment compared to the one you chose.
How is opportunity cost calculated?: The calculator subtracts the return of your chosen option from the return of the best alternative. The result is the percentage of return you forgo by not choosing the alternative.
Can opportunity cost be negative?: Yes, if your chosen option's return is higher than the best alternative, the opportunity cost is negative, meaning you made a better choice than the alternative.

Tips & Common Mistakes

Tips

Ensure you use the same time period for both returns to get an accurate comparison.
Consider all potential alternatives, not just the most obvious one, to find the true best alternative.
Use the calculator to quickly see if your chosen option is outperforming the alternative by a significant margin.
Remember that opportunity cost is just one factor; consider risk and liquidity as well.

Common Mistakes to Avoid

Using different time periods for the returns, which skews the comparison.
Forgetting to include all relevant alternatives, leading to an inaccurate best alternative return.
Confusing opportunity cost with actual loss; it's a measure of forgone potential, not a direct financial loss.

Last updated: August 13, 2026