⚖️ Opportunity Cost Calculator
TL;DR: A $500 purchase costs 25 hours at a $20 real wage; invested at a 7% real return, that $500 could grow to $983 in 10 years or $1,934 in 20.公式▸▾
Formula: future value forgone = price × (1 + real annual return)^years
| Example 1 | $100 → $387 in 20 years |
|---|---|
| Example 2 | $500 → $1,934 |
| Example 3 | $1,200 → $4,643 |
By Y.W. FungIndependently designed & maintainedLast reviewed: Method & LimitsReport a correction
Every purchase has two prices: the hours of life you trade for it today, and the money it would have become if you had invested it instead. This calculator shows both.
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Your calculated real hourly rate
Based on your income type after taxes
$15.75 / hr
1. Your real financial footprint
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Total: 63.4 hoursiPhone 16 Pro
$999 • ≈ 7.9 days of work
63.4 hrs
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Educational estimates only — not financial advice.
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The opportunity cost formula
opportunity cost = value of best alternative − value of chosen option hours of life = price ÷ real hourly wage future value = price × (1 + real annual return) ^ years lifetime cost = annual recurring spend × 25 (FIRE rule of thumb)
Economists define opportunity cost as the value of the next-best option you gave up. For household spending there are two next-best options worth pricing. The first is time: the price divided by your real hourly wage, which is your net pay after tax and job-only costs spread across every hour the job consumes, commuting included. The second is compounding: the same money left invested at a realistic long-run real return.
Recurring spending is where the arithmetic turns dramatic. A $50 monthly habit is $600 a year, and financial-independence math multiplies annual expenses by 25 to estimate the capital needed to cover them forever — so that habit quietly adds $15,000 to the amount you must save before work becomes optional.
Opportunity cost examples
Assumes a $20 real hourly wage and a 7% real annual return. Returns are illustrative, not a forecast.
| Purchase | Hours of life | Worth in 10 yrs | Worth in 20 yrs |
|---|---|---|---|
| $100 | 5.0 hrs | $197 | $387 |
| $500 | 25.0 hrs | $983 | $1,934 |
| $1,200 | 60.0 hrs | $2,360 | $4,643 |
| $5,000 | 250.0 hrs | $9,836 | $19,348 |
Frequently asked questions
- What is opportunity cost in simple terms?
- Opportunity cost is the value of the best thing you give up to get what you chose. Spending $500 on a gadget costs you the $500 plus everything that money and the hours behind it could have become.
- How do you calculate opportunity cost?
- Opportunity cost = value of the best alternative − value of the option chosen. For spending, compare the price with the same amount invested: price × (1 + r)^years at your expected return.
- What is the opportunity cost formula for investing money instead?
- Future value = amount × (1 + annual return)^years. $500 at a 7% real return is $983 in ten years and $1,934 in twenty — the true cost of the purchase.
- How does opportunity cost relate to hours of life?
- Divide the price by your real hourly wage. A $500 purchase at a $20 real wage costs 25 working hours today, and the invested alternative would have been worth about 97 hours in twenty years.
- Salary to Hourly Calculator: find your real hourly wage first →
- Guide: how purchases keep costing future you →
Data sources
Data sources & Risk disclaimer
- U.S. Bureau of Labor Statistics — Occupational Employment and Wage Statistics, May 2024
- IRS — 2024 Federal Income Tax Brackets (Form 1040)
- Deloitte Digital Media Trends 2024 — average US household streaming spend (~$61/month)
Historical or assumed rates do not guarantee future performance. This is a general estimation tool, not personalized financial advice. Actual fees and tax should follow official issuer and IRS latest documents.
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