Inflation Calculator
See how inflation affects purchasing power. Current amount, inflation rate, and projection years.
Free · Runs in your browser · No signup
Simplified projection — not financial advice.
Examples to try
Idea
Future cost ≈ amount × (1 + rate)years. Purchasing power falls as prices rise.
Common mistakes
- Using one constant rate for decades of real history.
- Confusing inflation with investment return.
- Ignoring that personal baskets differ from CPI.
Scope: Educational purchasing-power math. Not a forecast. See investment.
How to Use
Enter your values in the fields above and click Calculate to get instant results. Calculations run in your browser. Results are estimates for personal planning only.
Related Calculators
Inflation Erodes Purchasing Power
Each year inflation reduces what a fixed amount of money can buy. To find what today's dollars will be worth in the future (or what past dollars are worth today), divide by cumulative growth.
Future purchasing power = today's amount ÷ (1 + rate)^years
At 3% annual inflation, $100,000 today buys what about $74,000 could buy in 10 years. At 7% inflation, that same figure drops to roughly $51,000.
Inflation Impact Over Time
At 2% inflation: $100 → $82 (10 yr) → $67 (20 yr) → $45 (40 yr)
At 3% inflation: $100 → $74 (10 yr) → $55 (20 yr) → $31 (40 yr)
At 5% inflation: $100 → $61 (10 yr) → $37 (20 yr) → $14 (40 yr)
At 7% inflation: $100 → $51 (10 yr) → $26 (20 yr) → $6.70 (40 yr)
Historical US average is ~3%, but it has exceeded 8% in high-inflation years. Investments historically outpace inflation at 6–7% average annual returns.
Understanding Inflation and Its Impact
Inflation measures the rate at which the general price level of goods and services rises over time, eroding purchasing power. The formula for future value with inflation is: Future Value = Present Value × (1 + inflation rate)^years. Conversely, to find today's equivalent of a future amount: Present Value = Future Value / (1 + inflation rate)^years.
The Consumer Price Index (CPI) is the most common measure of inflation. In the US, the Bureau of Labor Statistics publishes CPI monthly, tracking price changes for a basket of goods including food, housing, transportation, and healthcare. Historical average US inflation is about 3% per year, though it varies significantly by decade.
Inflation affects every financial decision: savings, investments, retirement planning, salary negotiations, and loan terms. A 3% annual inflation rate means prices double approximately every 24 years (Rule of 72: 72/3 = 24). This is why investing — not just saving — is essential for long-term wealth preservation.
Real-World Inflation Examples
Example 1 — Purchasing power erosion: $50,000 today at 3% inflation will have the purchasing power of $50,000/(1.03)^10 = $37,205 in 10 years. You would need $67,196 to buy the same goods in 10 years.
Example 2 — Salary comparison: A job paying $60,000 with 2% annual raises vs. $65,000 with no raises. After 5 years: Job 1 = $60,000×(1.02)^5 = $66,244. Job 2 = $65,000. In real terms (adjusted for 3% inflation), Job 1 purchasing power = $66,244/(1.03)^5 = $57,104, while Job 2 = $65,000/(1.03)^5 = $56,027. Job 1 is better despite the lower starting salary.
Example 3 — Retirement planning: If you need $50,000/year in retirement and plan to retire in 30 years at 3% inflation, you'll need $50,000×(1.03)^30 = $121,363/year in future dollars. Over a 25-year retirement, total needs = ~$3.03 million in nominal terms.
Protecting Against Inflation
- Invest, don't just save: Savings accounts earning 1-2% lose value in real terms when inflation is 3%+. Stock market index funds have historically returned 7-10% annually, outpacing inflation.
- Consider TIPS: Treasury Inflation-Protected Securities (TIPS) adjust their principal based on CPI, providing guaranteed real returns.
- Negotiate salary regularly: If your salary doesn't increase at least with inflation, you're effectively taking a pay cut each year.
- Lock in fixed-rate debt: Inflation erodes the real value of fixed-rate loans. A 30-year fixed mortgage becomes cheaper in real terms over time as inflation rises.
- Diversify income sources: Rental income, dividend stocks, and business income often rise with inflation, providing natural hedges.
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Frequently Asked Questions
How does inflation affect purchasing power?
Inflation reduces the value of money over time. At 3% annual inflation,
What is the Consumer Price Index (CPI)?
The CPI measures the average change in prices paid by consumers for goods and services. It is the most widely used measure of inflation, published by the Bureau of Labor Statistics.
How do I protect my savings from inflation?
Invest in assets that historically outpace inflation: stocks, real estate, Treasury Inflation-Protected Securities (TIPS), and I Bonds. Keeping all savings in cash means losing purchasing power over time.
What is a realistic long-term inflation rate to use?
For US planning, 2.5–3% reflects the long-term historical average. During high-inflation periods, actual rates can spike to 7–9%. Use a conservative estimate for essential-expense planning and consider scenarios at 2%, 4%, and 6% to bracket uncertainty.
How does inflation affect savings and investments?
Cash sitting below the inflation rate loses real purchasing power every year. Savings accounts under 3–4% effectively shrink. Assets that historically beat inflation include broad stock index funds (6–7% real return), real estate, and inflation-protected bonds (TIPS).