Inflation Calculator & Purchasing Power Tracker

What is the Consumer Price Index (CPI) basket composition?

The Consumer Price Index (CPI) measures the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services. This basket is divided into major expenditure groups: housing, food and beverages, transportation, medical care, apparel, recreation, education, and communication. The weights assigned to each group reflect their share in average household expenditures and are updated periodically by statistical bureaus (like the US Bureau of Labor Statistics) to match modern consumer spending patterns.

What are the primary historical drivers of inflation?

Historical price spikes generally stem from three sources: demand-pull inflation (where aggregate demand outpaces supply, bid up by consumer or government spending), cost-push inflation (where rising costs of raw materials, energy, or labor reduce supply and push up retail prices, such as the OPEC oil shocks of the 1970s), or monetary expansion (when central banks increase the money supply faster than the economy grows, causing the value of each dollar to depreciate).

What is the difference between real and nominal returns?

A nominal return is the raw interest rate or growth rate earned on an investment, before accounting for purchasing power changes. A real return, however, adjusts the nominal growth to reflect inflation. For example, if your investment grows by 7% (nominal return) in a year where inflation is 3%, your real return is approximately 4% (7% - 3%). Real returns represent the actual net increase in the volume of goods and services your money can purchase.

Methodology

This calculator computes the erosion of purchasing power and price escalation over time. Using an average annual inflation rate, we calculate both the nominal future cost of a fixed basket of goods and the depreciated real value of cash kept under a mattress (non-earning capital).

* Where PV = Present Value (the original cash amount), i = annual inflation rate (CPI index delta), and n = duration in years.