# Opportunity Cost Calculator Calculate the opportunity cost of any financial decision. Compare what your money could earn in an alternative investment over time. ## What this calculates Every financial decision has a trade-off. Enter the amount, expected returns for both options, and your time horizon to see what you give up by choosing one path over another. ## Inputs - **Amount Invested / Spent** ($) — min 0 — The amount you plan to spend or invest in your chosen option. - **Chosen Option Return (%/yr)** (%) — min -50, max 100 — Expected annual return of your chosen option (0% for a purchase). - **Alternative Return (%/yr)** (%) — min -50, max 100 — Expected annual return if the money were invested elsewhere (e.g., S&P 500 average). - **Time Horizon** (years) — min 1, max 50 — Number of years to compare the two options. ## Outputs - **Chosen Option Value** — formatted as currency — Future value of your money under the chosen option. - **Alternative Value** — formatted as currency — Future value if invested in the alternative option. - **Opportunity Cost** — formatted as currency — The difference in value you give up by choosing your option. - **Opportunity Cost (%)** — formatted as percentage — Opportunity cost as a percentage of the alternative's future value. ## Details Opportunity cost is the value of the next best alternative you give up when making a decision. If you spend $10,000 on a vacation instead of investing it at 8% annually, after 10 years that vacation actually cost you $21,589 (the amount you would have had), not just the $10,000 sticker price. This concept applies to every financial choice: buying a car vs. investing, paying off debt vs. investing, choosing a savings account over the stock market, or even picking between two investments with different expected returns. The formula: Opportunity Cost = Future Value of Alternative - Future Value of Chosen Option. Opportunity cost does not mean you should always pick the highest-return option. Risk, liquidity, and personal satisfaction all matter. Paying off a 6% mortgage instead of investing at a historical 10% stock market average has a calculable opportunity cost, but the peace of mind and guaranteed return of debt elimination have real value too. Use this calculator to quantify the trade-off so your decision is informed, not impulsive. ## Frequently Asked Questions **Q: What exactly is opportunity cost?** A: Opportunity cost is the potential benefit you miss out on when choosing one option over another. In finance, it is usually measured as the difference in returns between the option you chose and the best alternative. For example, if you park $50,000 in a savings account earning 4% instead of investing it at 10%, your annual opportunity cost is $3,000 (the extra 6% you could have earned). **Q: Can opportunity cost be zero or negative?** A: Opportunity cost is zero when both options produce the same return. It becomes negative (meaning you made the better choice) when your chosen option outperforms the alternative. This calculator shows zero when the chosen option wins. In practice, opportunity cost is only relevant when the alternative would have been better. **Q: How does time horizon affect opportunity cost?** A: Time dramatically amplifies opportunity cost because of compounding. A small difference in annual returns (say 2% vs. 8%) barely matters over 1 year, but over 20 years it is massive. $10,000 at 2% for 20 years grows to $14,859, while at 8% it grows to $46,610. The opportunity cost of the lower-return choice is $31,751, more than three times your original amount. **Q: Should I always pick the highest-return option?** A: Not necessarily. Higher returns usually come with higher risk. A guaranteed 4% savings account has a real opportunity cost compared to stocks averaging 10%, but stocks can lose 30% in a bad year. Opportunity cost is one input in your decision, not the only one. Consider your risk tolerance, time horizon, liquidity needs, and personal goals before choosing. --- Source: https://vastcalc.com/calculators/finance/opportunity-cost Category: Finance Last updated: 2026-04-08