Inflation Calculator
Calculate how inflation erodes your purchasing power over time — see future price levels, cumulative inflation, year-by-year breakdown, and price doubling time.
Inflation Calculator
Calculator Settings
How It Works
Enter the amount of money you have today, the expected annual inflation rate, and the number of years. The calculator shows how much purchasing power you lose over time and what price levels will look like in the future.
Calculation Results
Future Purchasing Power
$744.09
Lost 25.6% of buying power
Future Price Level
$1.34K
to buy what costs $1.00K today
Purchasing Power Lost
$255.91
25.6% erosion
Cumulative Inflation
34.4%
over 10 years
Prices Double In
~24.0 yrs
Rule of 72
Year-by-Year Breakdown
| Year | Price Level | Buying Power | Cum. Inflation |
|---|---|---|---|
| 1 | $1.03K | $970.87 | 3.0% |
| 2 | $1.06K | $942.60 | 6.1% |
| 3 | $1.09K | $915.14 | 9.3% |
| 4 | $1.13K | $888.49 | 12.6% |
| 5 | $1.16K | $862.61 | 15.9% |
| 6 | $1.19K | $837.48 | 19.4% |
| 7 | $1.23K | $813.09 | 23.0% |
| 8 | $1.27K | $789.41 | 26.7% |
| 9 | $1.30K | $766.42 | 30.5% |
| 10 | $1.34K | $744.09 | 34.4% |
Complete Guide to Inflation & Purchasing Power
What Is Inflation?
Inflation is the rate at which the general level of prices for goods and services rises over time, reducing the purchasing power of each unit of currency. When inflation runs at 3% per year, something that costs $100 today will cost roughly $103 next year.
Understanding inflation is essential for financial planning. If your savings or investments grow slower than inflation, you are effectively losing money in real terms — even though the nominal balance looks bigger. Use our Compound Interest Calculator to see how compounding offsets inflation over time.
Inflation Formulas
Future Price Level (what things will cost):
Future Price = Current Price x (1 + i)^n
Where: i = annual inflation rate (decimal), n = number of years
Future Purchasing Power (what your money will buy):
Purchasing Power = Current Amount / (1 + i)^n
Where: i = annual inflation rate (decimal), n = number of years
Price Doubling Time (Rule of 72):
Years to Double = 72 / Inflation Rate (%)
Quick approximation — at 3% inflation, prices double in ~24 years
Why Inflation Matters for Your Finances
Retirement Planning
A comfortable retirement today may not be enough 20-30 years from now. Use our SIP Calculator to plan monthly contributions with inflation-adjusted targets.
Savings Strategy
Cash in a bank account earning 1% while inflation runs at 3% means you lose 2% of real value every year. Check our Savings Goal Calculator to beat inflation.
Investment Returns
Always evaluate investment returns in "real" terms — nominal return minus inflation. A 7% return with 3% inflation is only 4% real growth.
Salary Negotiation
If your raise is below the inflation rate, you are effectively taking a pay cut in purchasing power terms — even though the number on your paycheck went up.
Tips for Beating Inflation
Invest in growth assets: Equities, real estate, and inflation-protected bonds (TIPS/I-Bonds) historically outpace inflation over long horizons.
Use the Rule of 72: Divide 72 by the inflation rate to estimate how many years until prices double. At 6% inflation, prices double in just 12 years.
Plan with real returns: When setting savings goals or evaluating investments, always subtract the expected inflation rate from the nominal return. Use our Investment Inflation Calculator to see real vs nominal growth side by side.
Common Mistakes
Ignoring Inflation in Long-Term Plans
Many people plan retirement savings based on today's cost of living. At 3% inflation, you need roughly twice as much money in 24 years to maintain the same lifestyle.
Confusing Nominal and Real Returns
An investment returning 8% sounds great — until you realize 4% went to inflation. Always measure wealth growth in purchasing-power terms, not just dollar amounts.
Assuming Inflation Is Constant
Inflation fluctuates year to year. Historical averages (2-3% in developed economies) are useful for planning, but periods of high inflation (5-10%+) can devastate savings rapidly.
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OpenFrequently Asked Questions
What is inflation and how is it measured?
Inflation is the rate at which the general price level rises, eroding purchasing power. Measured by Consumer Price Index (CPI) tracked by government statistics bureaus. The 'headline' rate includes everything; 'core' inflation strips out volatile food and energy. Most central banks target ~2% annual inflation.
How does inflation erode purchasing power?
$100 today buys 100 'units' of stuff. At 3% inflation, the same $100 buys only ~74 units in 10 years and ~55 units in 20 years. Conversely, prices rise: a $1 coffee today costs ~$1.34 in 10 years and ~$1.81 in 20 years at 3%. The calculator shows future price levels for any scenario you specify.
What is the rule of 70 for inflation?
Years for prices to double ≈ 70 ÷ inflation rate. At 3% inflation, prices double every ~23 years. At 5%, every ~14 years. At 7%, every 10 years. It's a quick mental check — when inflation is hot, your dollars are halving in purchasing power within a single decade.
What's a 'normal' inflation rate?
Long-term US CPI averages ~3% annually. Recent decades trended lower (1.5–2.5%) before the 2022 spike to 9%. Eurozone targets 2%. Japan struggled with deflation for decades. India averages 5–6%. Argentina has triple-digit inflation. Use your country's long-run average for planning.
How does inflation affect investments?
Real return = nominal return − inflation. A 7% nominal return at 3% inflation is only ~4% real. Stocks have historically outpaced inflation by ~7% real over long periods. Bonds barely keep up. Cash loses purchasing power continuously. TIPS (Treasury Inflation-Protected Securities) and real assets (real estate, commodities) provide direct inflation hedges.
What's the difference between this and the Investment Inflation Calculator?
This Inflation Calculator focuses on the inflation phenomenon itself — future prices, doubling time, cumulative inflation. The Investment Inflation Calculator combines inflation with investment growth to show real returns and inflation-adjusted future values. Use this for understanding inflation; use Investment Inflation for retirement/savings planning.