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Free Inflation Calculator — Purchasing Power & Future Cost

See how inflation erodes your money's purchasing power over time and what it will cost to buy the same goods in the future.

This free inflation calculator uses the standard CPI compounding formula to show the future equivalent cost of any dollar amount, the real purchasing power of your savings, and the minimum investment return needed to beat inflation — instantly, no sign-up required.

What Is Inflation and Why Does It Matter?

Inflation is the gradual increase in the price of goods and services over time. A 3% annual inflation rate means that something costing $100 today will cost $134 in 10 years and $181 in 20 years.

For savers, inflation is the silent enemy. Cash sitting in a low-interest account loses value in real terms every year. A $100,000 nest egg at 0% interest is worth only $74,410 in real purchasing power after 10 years at 3% inflation.

This is exactly why the compound interest calculator should always be paired with this inflation calculator. You need at least 3% annual return just to stand still — and 7%+ to build real wealth.

How to Use This Inflation Calculator

  1. 1

    Enter the Current Amount

    The dollar amount you want to measure — could be your savings balance, the price of a house, your annual salary, or any other dollar figure.

  2. 2

    Set the Annual Inflation Rate

    The default is 3.0% — the US 40-year historical average. For recent high inflation periods, try 4–5%. To project the real cost of a specific item (e.g. college tuition), use that category's historical rate.

  3. 3

    Choose the Time Period

    How many years into the future do you want to project? Common horizons: 5 years (medium-term planning), 10 years (decade planning), 20–30 years (retirement planning).

Inflation Formula Explained

Future Cost = Present Value × (1 + i)t

Example: $10,000 × (1 + 0.03)^10 = $10,000 × 1.3439 = $13,439

Purchasing Power = Present Value / (1 + i)t

Example: $10,000 / (1.03)^10 = $7,441 — what your $10,000 buys in 10 years

Real-World Inflation Examples

See how inflation erodes real purchasing power.

Salary: $100,000 in 10 Years at 3% Inflation

A $100,000 salary today has the same purchasing power as $134,392 in 10 years at 3% inflation. If your salary doesn't grow by at least 3% per year, you are effectively getting a pay cut every year in real terms.

Retirement Savings: $1,000,000 at 3% for 20 Years

$1,000,000 in retirement savings at 3% inflation for 20 years has only $553,676 in real purchasing power. This is why financial planners recommend investing in assets that outpace inflation — and why cash-heavy portfolios destroy retirement security.

Housing: $500,000 Home in 30 Years at 4% Inflation

A $500,000 home at 4% annual price inflation will cost $1,621,491 in 30 years. US home prices have historically appreciated at roughly 3–4% annually, but with wide regional variation. Buying earlier typically locks in lower nominal costs.

Frequently Asked Questions

What is inflation?
Inflation is the rate at which the general price level of goods and services rises, eroding purchasing power — at 3% annual inflation, $100 today buys only $74 worth of goods in 10 years. The US Federal Reserve targets 2% inflation. Higher inflation reduces the real value of savings and cash holdings.
What is the average US inflation rate?
The long-run average US inflation rate is approximately 3.0% per year since 1926, based on the Consumer Price Index (CPI). During 2021–2023 inflation spiked to 7–9% before returning toward 3%. For long-term financial planning, 3% is the standard conservative assumption.
How does inflation affect my savings?
At 3% inflation, $10,000 in cash loses $1,344 in purchasing power over 5 years — it still says $10,000 but buys only $8,626 of goods. To just preserve purchasing power you need at least a 3% return. To grow real wealth you need returns above the inflation rate — historically 7% nominal = 4% real for US stocks.
What return do I need to beat inflation?
At 3% inflation, you need at least a 3% annual return to maintain purchasing power. At 7% nominal return and 3% inflation, your real return is approximately 3.9% (using the Fisher equation: (1+0.07)/(1+0.03) − 1). The S&P 500 has averaged about 7% real return historically, making it the most reliable inflation beater.
What will $100,000 be worth in 20 years at 3% inflation?
At 3% annual inflation, $100,000 in purchasing power today requires $180,611 in 20 years to buy the same goods — a $80,611 increase. Equivalently, your $100,000 cash will only buy $55,368 worth of goods in 20 years. This is why investing — not just saving — is essential for long-term financial health.
How does inflation affect my retirement savings?
If you retire with $1,000,000 and inflation averages 3%, your purchasing power drops to $737,424 in 10 years and $543,794 in 20 years in real terms. This is why the 4% rule builds in a buffer — and why inflation-protected investments (TIPS, Series I Bonds, index funds) are core retirement tools.

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