Inflation Calculator

What Is Inflation?

Inflation is the sustained increase in the general price level of goods and services in an economy over time. When the price level rises, each unit of currency buys fewer goods and services than it did before. In practical terms, inflation means your dollar today will buy less tomorrow.

A moderate level of inflation is considered normal and even healthy for a growing economy. The Federal Reserve targets an annual inflation rate of 2% as measured by the Personal Consumption Expenditures (PCE) index. This target exists because mild inflation encourages spending and investment — if your cash is slowly losing value, you have an incentive to put it to work rather than stuff it under a mattress.

The problem arises when inflation accelerates beyond that target. At 3-4% annually, it becomes a noticeable drag on purchasing power. At 7-10%, it fundamentally reshapes economic behavior. And at 50%+ per month — hyperinflation — it can collapse entire economies. The United States has never experienced true hyperinflation, but it has endured periods of painful price increases, most notably during the 1970s and early 1980s when annual inflation exceeded 13%.

Since the Federal Reserve was established in 1913, the US dollar has lost approximately 96% of its purchasing power. A dollar in 1913 would need to be worth roughly $33 today to have the same buying power. This is not a conspiracy — it is the mathematically inevitable result of sustained, compounding inflation over more than a century.

How Inflation Is Measured: CPI vs. PCE

The two primary measures of inflation in the United States are the Consumer Price Index (CPI) and the Personal Consumption Expenditures (PCE) price index. Both track price changes over time, but they use different methodologies and produce slightly different results.

Consumer Price Index (CPI-U)

Published monthly by the Bureau of Labor Statistics (BLS), the CPI measures price changes from the consumer's perspective. It tracks a fixed basket of approximately 80,000 goods and services across 23 metropolitan areas, including food, housing, transportation, medical care, clothing, recreation, and education. The CPI is the most widely quoted inflation number and is used to adjust Social Security payments, tax brackets, and TIPS bonds.

Personal Consumption Expenditures (PCE)

Published by the Bureau of Economic Analysis (BEA), the PCE is broader than the CPI. It includes expenditures made on behalf of consumers (like employer-paid health insurance) and accounts for substitution effects — when consumers switch to cheaper alternatives as prices rise. The PCE typically runs 0.3 to 0.5 percentage points lower than the CPI. The Federal Reserve uses the PCE (specifically “core PCE,” which excludes volatile food and energy prices) as its preferred inflation gauge for monetary policy decisions.

Why the Difference Matters

If you hear “inflation is 3.5%” on the news, that is almost always the CPI. When the Federal Reserve says it is “targeting 2% inflation,” it means 2% on the PCE. This discrepancy means the Fed's 2% target is roughly equivalent to 2.3-2.5% on the CPI — a distinction that matters when you are evaluating whether the Fed will raise or cut interest rates.

Historical US Inflation Timeline

Understanding inflation requires looking at what has driven it across different eras. Each period of high inflation has its own causes, consequences, and lessons.

The Inflation Tax: Why Cash Loses Value

Inflation is often called a “hidden tax” because it erodes the purchasing power of every dollar you hold without any legislation being passed and without any line item on your tax return. Unlike income tax or sales tax, the inflation tax is invisible and unavoidable for anyone holding cash.

Here is how it works: If you hold $100,000 in a savings account earning 0.5% interest while inflation runs at 3%, your purchasing power declines by roughly $2,500 per year. After 10 years, your $100,000 can only buy what $74,000 could have bought when you started — even though your bank statement still reads $105,000. You feel richer on paper, but you are poorer in reality.

The inflation tax disproportionately affects people who hold cash, have fixed incomes, or lack access to financial markets. Retirees on fixed pensions, minimum wage workers, and people in developing countries without access to investment vehicles bear the heaviest burden. Meanwhile, borrowers actually benefit from inflation because they repay debts with cheaper dollars. This is why governments, which are always the largest borrowers, have a structural incentive to tolerate inflation.

Milton Friedman famously said, “Inflation is always and everywhere a monetary phenomenon.” While the causes of specific inflation episodes are complex (supply shocks, demand surges, expectations), the long-run trend is clear: fiat currencies lose value over time. In the 5,000-year history of human civilization, every fiat currency that has ever existed has eventually gone to zero. The US dollar has held up better than most, but it has still lost 96% of its value since 1913.

How to Beat Inflation: 5 Proven Strategies

If inflation is an invisible tax on your savings, then investing is the only reliable way to avoid paying it. Here are five historically proven strategies for preserving and growing your purchasing power.

Hyperinflation: When Money Dies

Hyperinflation — typically defined as inflation exceeding 50% per month — is the extreme endpoint of monetary mismanagement. While the US has never experienced it, several countries have, and the results are catastrophic. Savings are wiped out, contracts become meaningless, and the social fabric of entire nations unravels.

The common thread in every hyperinflation is a government that prints money to cover spending it cannot fund through taxation or borrowing. The United States benefits from the dollar's status as the world's reserve currency, which creates persistent global demand for dollars and US Treasury bonds. This privilege has allowed the US to run large deficits without triggering hyperinflation — but it is not a guarantee. As the national debt exceeds $34 trillion and annual interest payments approach $1 trillion, the sustainability of this arrangement is increasingly questioned by economists across the political spectrum.