💹 Inflation & Purchasing Power Calculator
Calculate future price increases, track purchasing power loss over time, and see how the Consumer Price Index (CPI) affects your cash savings.
See how uninvested cash sitting in a 0% bank account loses buying power over time due to inflation.
| Year | Cumulative Inflation | Equivalent Cost | Purchasing Power of Original Cash |
|---|
What is Inflation and How Does It Affect You?
Inflation is the rate at which the general level of prices for goods and services rises, causing purchasing power to fall. As inflation increases, every unit of currency buys a smaller percentage of a good or service over time. Central banks worldwide (such as the US Federal Reserve, Bank of England, and Reserve Bank of Australia) target an average inflation rate of 2.0% per year to maintain economic stability.
Future Cost = Present Cost × (1 + Inflation Rate)^YearsReal Purchasing Power = Nominal Cash Amount ÷ (1 + Inflation Rate)^YearsCumulative Inflation Rate (%) = [ ((1 + Inflation Rate)^Years) − 1 ] × 100Purchasing Power Loss (%) = [ 1 − (1 ÷ (1 + Inflation Rate)^Years) ] × 100
The Rule of 72 for Inflation: How Fast Do Prices Double?
You can use the mathematical Rule of 72 to quickly estimate how many years it will take for prices to double (or for your cash value to be cut in half) at a given inflation rate:
Years to Double Prices = 72 ÷ Annual Inflation Rate (%)
| Inflation Rate (%) | Years for Prices to Double | Purchasing Power of $100 after 20 Years |
|---|---|---|
| 2.0% (Fed Target) | 36.0 years | $67.30 (Lost 32.7%) |
| 3.0% (US Historical Avg) | 24.0 years | $55.37 (Lost 44.6%) |
| 4.0% (Moderate) | 18.0 years | $45.64 (Lost 54.4%) |
| 5.0% (High) | 14.4 years | $37.69 (Lost 62.3%) |
| 7.0% (2022 Peak Peak) | 10.3 years | $25.84 (Lost 74.2%) |
Historical US Consumer Price Index (CPI) Highlights
According to official data from the US Bureau of Labor Statistics (BLS):
- $100 in 1970 has the same buying power as approximately $810 in 2024 (over 700% cumulative inflation).
- $100 in 2000 requires roughly $182 in 2024 to purchase the same basket of goods.
- $100 in 2020 requires approximately $121 in 2024 due to the post-pandemic inflation spike.
5 Best Hedges Against Inflation
- Stock Market Index Funds (S&P 500): Historically returns ~10% annually, comfortably outpacing the 3% historical inflation average.
- Real Estate: Property values and rental incomes naturally rise alongside inflation over long horizons.
- Treasury Inflation-Protected Securities (TIPS) & Series I Bonds: US government bonds whose principal value automatically increases with CPI inflation.
- High-Yield Savings Accounts (HYSA): Online banks offering 4.0%–5.25% APY help mitigate short-term cash erosion.
- Commodities & Precious Metals: Gold and physical commodities historically preserve purchasing power during prolonged inflationary shocks.
Frequently Asked Questions
Inflation is the broad economic phenomenon of rising prices. The Consumer Price Index (CPI) is the specific monthly metric used by governments to track price changes in a representative basket of goods and services (food, housing, energy, healthcare, transportation).
Shrinkflation occurs when manufacturers reduce the size, weight, or quantity of a product while keeping the retail price unchanged (e.g., a cereal box shrinking from 16 oz to 14 oz for the same $4.99 price). It is a form of hidden inflation that erodes value without changing sticker prices.
Hyperinflation refers to extremely rapid, out-of-control price increases — typically defined as inflation exceeding 50% per month. Historical examples include Weimar Germany in 1923, Zimbabwe in 2008, and Venezuela in 2018.
A mild 2% inflation rate encourages consumer spending and business investment today rather than delaying purchases. 0% inflation carries a high risk of Deflation (falling prices), which causes consumers to stop spending, leading to severe economic recessions and job losses.