Opportunity Cost Calculator
Every purchase has a hidden cost — what the money could have earned. See the true price of any buying decision.
Future value in 20 years
$3,869.68
Opportunity cost of spending
$2,869.68
Growth you give up
Real value (inflation-adjusted)
$2,142.55
Real annual return
3.88%
Updates instantly · formula shown below
How to use this opportunity cost calculator
- Enter the purchase amount.
- Set how long you could have invested it (retirement is common).
- 7% mirrors S&P 500 long-term returns; 4% real (after inflation) is conservative.
Formula
Future value = amount × (1 + rate)^years. Real return = ((1 + nominal) ÷ (1 + inflation)) − 1.
About the Opportunity Cost Calculator
$1,000 invested at 7% for 30 years becomes $7,612. That impulse purchase doesn't just cost $1,000 — it costs $6,612 in foregone investment growth. This reframe doesn't mean never spend, but it ensures you choose consciously.
Frequently asked questions
+Should I never spend money?
No. This helps you choose consciously. Experiences, education and necessities often have returns that money can't capture.
+What if the purchase earns value too?
A course that earns an extra $20k/year has a positive net opportunity value. Not all spending is pure cost.
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