Opportunity Cost Calculator
Results are estimates based on the values you enter. Recheck your inputs and assumptions before using the output for decisions.
Compare a chosen option with the next best alternative to estimate opportunity cost.
Opportunity Cost Calculator
Free online opportunity cost calculator to compare a chosen option with the next best alternative and estimate the value given up by making that choice. This calculator is useful for investors, business owners, students, managers, analysts, and anyone comparing alternatives where one decision means giving up another. Opportunity cost is one of the most important ideas in economics and decision-making because every choice uses limited resources that could have been used somewhere else.
This calculator uses three simple inputs. Chosen option value means the value, benefit, or outcome produced by the option you selected. Next best alternative value means the value of the best option you did not choose. Amount committed means the money or resources tied to the decision. Once those values are entered, the calculator shows opportunity cost, chosen option advantage, opportunity cost rate, and alternative-to-chosen ratio. These outputs help you see both the direct value difference between the two options and the scale of that difference relative to the resources committed.
The formula of opportunity cost
Opportunity cost = Next best alternative value – Chosen option value
Chosen option advantage = Chosen option value – Next best alternative value
Opportunity cost rate = Opportunity cost / Amount committed
Alternative-to-chosen ratio = Next best alternative value / Chosen option value
Here chosen option value means the outcome from the path you selected, next best alternative value means the outcome from the best path you gave up, opportunity cost means the amount of value forgone by choosing the selected option, chosen option advantage means how much the selected option is ahead or behind the alternative, opportunity cost rate means the forgone value relative to the amount committed, and alternative-to-chosen ratio shows the size relationship between the two outcomes.
Solved Example
Example 1: Find the opportunity cost if the chosen option value is $18,000, the next best alternative value is $22,000, and the amount committed is $20,000.
Solve: Opportunity cost = 22000 – 18000 = $4,000
Chosen option advantage = 18000 – 22000 = -$4,000
Opportunity cost rate = 4000 / 20000 = 20%
Alternative-to-chosen ratio = 22000 / 18000 = 1.2222
Example 2: Find the result if the chosen option value is $45,000, the next best alternative value is $38,000, and the amount committed is $30,000.
Solve: Opportunity cost = 38000 – 45000 = -$7,000
Chosen option advantage = 45000 – 38000 = $7,000
Opportunity cost rate = -7000 / 30000 = -23.3333%
Alternative-to-chosen ratio = 38000 / 45000 = 0.8444
Example 3: Find the result if the chosen option value is $120,000, the next best alternative value is $135,000, and the amount committed is $100,000.
Solve: Opportunity cost = 135000 – 120000 = $15,000
Chosen option advantage = -$15,000
Opportunity cost rate = 15000 / 100000 = 15%
Alternative-to-chosen ratio = 135000 / 120000 = 1.1250
Table of opportunity cost calculator
| Chosen Option | Alternative Option | Opportunity Cost | Opportunity Cost Rate |
|---|---|---|---|
| $7,500 | $9,000 | $1,500 | 18.75% |
| $18,000 | $22,000 | $4,000 | 20.00% |
| $45,000 | $38,000 | -$7,000 | -23.3333% |
| $120,000 | $135,000 | $15,000 | 15.00% |
How to use this opportunity cost calculator
Enter the chosen option value in the proper input field. After that, enter the next best alternative value and the amount committed to the decision. Then click the calculate button. The calculator will show opportunity cost, chosen option advantage, opportunity cost rate, and alternative-to-chosen ratio in the result box.
This calculator is useful when comparing investment choices, project decisions, product launches, education paths, purchases, or resource-allocation options. A positive opportunity cost means the next best alternative would have delivered more value than the option chosen. A negative opportunity cost means the chosen option actually did better than the alternative. That makes the tool helpful not only before making a decision, but also when reviewing whether a past decision paid off relative to the best forgone option.
When using the result, remember that opportunity cost depends entirely on how the values are estimated. If the benefits of either option are uncertain or incomplete, the output will also be uncertain. Even so, opportunity cost remains one of the clearest ways to think about trade-offs. This calculator gives a practical estimate that supports comparison, planning, decision review, and economics learning.