Opportunity Cost Calculator
See what your past spending would be worth today if invested. Enter amount, years and return rate to reveal the real cost. Free, instant, no sign-up.
Examples
This is a hypothetical calculation for educational purposes. Past investment returns do not guarantee future results.
The opportunity cost calculator answers one of personal finance's most revealing questions: what would that money be worth today if you had invested it instead? Using the compound interest formula — Future Value = Amount × (1 + Rate)ⁿ — it calculates what any past purchase, impulse buy, or recurring expense would have grown to over any number of years. The default 10% annual return approximates the long-term historical average of broad stock market indexes like the S&P 500, though you can adjust this to reflect bonds, savings accounts, or any other investment vehicle.
Understanding opportunity cost transforms how you think about money. A $5 daily coffee habit over 10 years isn't just $18,250 — at a 10% annual return, it's closer to $30,000 in foregone investment growth. A $1,200 smartphone purchased and replaced every 3 years represents not just the purchase price but a compounding opportunity that grows larger the longer the timeline. Use the Subscription Cost Calculator alongside this tool to quantify the full opportunity cost of your recurring expenses, and our Salary Calculator to understand the number of hours you work to fund them.
Important: This calculator is an educational tool illustrating the concept of opportunity cost through hypothetical compound growth. It does not account for taxes, investment fees, inflation, or market volatility. Past returns do not guarantee future performance. It is not financial advice.