📉 Inflation Calculator

How much is your cash in the bank really worth?

Last updated: March 2026

* This calculator is for educational purposes only and does not constitute financial advice.

Inflation is the silent thief of savings. When your money sits in a savings account earning near-zero interest, it loses purchasing power every year. With US inflation averaging 3-4% in recent years, every $100,000 in cash effectively loses $3,000-$4,000 in buying power annually. The Consumer Price Index (CPI) measures this erosion.

The goal isn't to scare you — it's to show why investing matters more than just saving. Smart investing in diversified index funds, Treasury Inflation-Protected Securities (TIPS), or real estate allows your money to grow at a rate that outpaces inflation and preserves its real value.

Enter the amount sitting in your bank account, the annual inflation rate (3% is a reasonable long-term US average), and the time period in years. The calculator will show the real value of your money — its actual purchasing power after inflation — and the total value lost to erosion over time.

📊 How does this compare to a S&P 500?

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FAQ

What is inflation?

Inflation is the general rise in prices, causing your money to buy fewer things over time. If inflation is 3%, what costs $100 today will cost $103 next year. The Consumer Price Index (CPI) measures inflation in the US.

Why shouldn't I keep cash in savings?

Cash in a savings account earns near-zero to low interest (even high-yield savings offer 4-5% temporarily) while inflation erodes its value. In the long run, you need investments that consistently outpace inflation.

How do I protect my money from inflation?

By investing in assets that grow faster than inflation — such as stocks, Treasury Inflation-Protected Securities (TIPS), I Bonds, real estate, or diversified index funds.

What's the difference between nominal and real returns?

Nominal returns are the raw percentage gain (e.g., 10% stock return). Real returns subtract inflation (e.g., 10% - 3% inflation = 7% real return). Always think in real terms to understand your actual purchasing power growth.

Are TIPS and I Bonds good inflation hedges?

Yes. TIPS (Treasury Inflation-Protected Securities) adjust with CPI, protecting your principal. I Bonds earn a fixed rate plus inflation adjustment and are capped at $10,000/year per person. Both are backed by the US government — among the safest inflation hedges available.

How much has US inflation been historically?

The long-term US inflation average is about 3% per year. But it spikes periodically — 2022 saw 9.1% CPI. Even at 3%, $100,000 loses nearly half its purchasing power in 20 years, which is why staying invested matters.

Does the stock market beat inflation long-term?

Historically, yes. The S&P 500 has returned ~10% annually (nominal) or ~7% after inflation. Over 30 years, $100,000 invested would grow to ~$760,000 in real terms, while cash would shrink to ~$41,000 in purchasing power at 3% inflation.

Is this better than an index fund?

Compare your results to investing in a S&P 500 at ~10% annually. Use this as a baseline to evaluate your investment decision.

Want to see the power of compound interest? Try the Magic of Compounding Calculator

📊 Data source: Standard financial models. Prices and data in this article are reviewed and updated semi-annually. Last update: March 2026.

📉 $100 Today ≠ $100 Tomorrow: The Silent Thief Emptying Your Wallet

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📊 Financial Planning

Created by Amiel Riss | SmartMoney77

Who Is This Calculator For?

Cash hoarders

You keep a large amount in savings accounts or under the mattress. This calculator shows how much purchasing power you're losing every year — the "inflation tax" that nobody sends you a bill for.

Salary negotiators

If your salary didn't increase by at least the inflation rate this year, you got a pay cut. This calculator helps you quantify the real impact and make a stronger case for a raise.

Retirement planners

1,000,000 sounds like a lot today, but what will it buy in 20 or 30 years? This calculator shows why your retirement target needs to account for inflation — and by how much.

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