Inflation and Purchasing Power: What $100 Is Worth in 10, 20, and 30 Years
October 21, 2026
Inflation reduces what each dollar buys. The formula is future purchasing power = amount ÷ (1 + inflation)^years. At a steady 3% inflation, $100 today buys what $74.41 will buy in 10 years, $55.37 in 20 years, and $41.20 in 30 years. The reverse is also true: you need about $243 in 30 years to buy what $100 buys now.
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Even moderate inflation compounds over time. The table shows what $100 of today's purchasing power is worth later.
| Years | At 2% | At 3% | At 5% |
|---|---|---|---|
| 10 | $82.03 | $74.41 | $61.39 |
| 20 | $67.30 | $55.37 | $37.69 |
| 30 | $55.21 | $41.20 | $23.14 |
What It Means for Savings
Cash in a drawer or in an account paying less than inflation loses purchasing power every year. A savings account earning 1% while inflation is 3% has a real return of about −2%.
That does not mean you should keep no cash. An emergency fund is meant to be stable and available. The point is that money you will not need for many years usually needs to earn more than inflation, through investments that carry risk, to avoid slowly shrinking.
Planning Future Expenses
To estimate a future cost, multiply by (1 + inflation)^years. A $60,000-a-year lifestyle today would cost $60,000 × 1.03^30 = $145,636 per year in 30 years at 3% inflation. This is why retirement plans must be built in real terms.
Costs rise at different speeds. Healthcare and education have often risen faster than overall inflation, while technology goods have often become cheaper.
Frequently Asked Questions
How do I calculate the future value of today's money after inflation?
Divide by (1 + inflation rate) raised to the number of years.
What is a typical long-run inflation rate?
Many central banks target around 2%. Historical averages in the US have been closer to 3%, with large variation by decade.
How much will $1,000 be worth in 20 years at 3% inflation?
About $553 in today's purchasing power.
Does inflation affect fixed incomes?
Yes. Fixed payments buy less every year unless they are adjusted for inflation.