Inflation Calculator

Inflation is the rate at which the general price level of goods and services rises over time. In the US, the most-cited measure is the Consumer Price Index for All Urban Consumers (CPI-U), published monthly by the Bureau of Labor Statistics. CPI tracks a fixed basket of about 80,000 prices — food, housing, transport, medical care, recreation, education — weighted by how much an average urban household spends on each.

Long-run averages: US CPI ran near 3.2% per year from 1913–2023, near 2.5% from 1990–2020, and spiked to 9.1% in mid-2022 before falling back. A 'normal' year for inflation in the modern era is closer to 2–3%; anything above 4% historically marks an unusual stretch.

Different households experience different inflation rates. Lower-income households spend a larger share on food, energy, and housing — categories that swing harder than the headline number. Retirees on Social Security have COLAs based on CPI-W (a slightly different basket), which often understates the medical-care inflation they actually face.

A nominal value is the number on the price tag, paycheck, or contract — denominated in dollars of the year it was paid. A real value adjusts that number to account for inflation, restating it in dollars of a different (usually current) year. Real values are what allow apples-to-apples comparisons across decades.

A $50,000 salary in 1985 is not equivalent to a $50,000 salary today. Using the BLS CPI inflation calculator, $50,000 in 1985 has the same buying power as roughly $146,000 in 2024. Comparing nominal salaries across decades without adjusting for inflation will systematically make older eras look poorer than they were.

When evaluating investment returns, always use real returns for long-horizon planning. The S&P 500's long-run nominal return is about 10% per year; the real return after inflation is closer to 6.5–7%. A retirement plan built on the nominal number will overstate purchasing power 30 years out by a wide margin.

Cash loses value at the inflation rate. $10,000 sitting in a no-interest checking account loses about $300/year of buying power at 3% inflation. A high-yield savings account at 4–5% currently earns slightly more than inflation; longer-term holdings should generally be in inflation-resistant assets (stocks, real estate, TIPS).

Long-term contracts (rental leases, salary agreements, alimony, child support) should specify inflation-adjustment clauses if they extend more than a few years. A 5-year lease at a fixed rent, in a 3% inflation environment, hands the tenant a roughly 14% discount over the life of the lease — which is good for tenants and bad for landlords.

Government benefits (Social Security, federal pensions, military retirement) usually include annual COLAs tied to CPI. Private pensions often do not, which is the single biggest reason private pensions lose value to retirees over a 20–30 year retirement.

Modern central banks (the Federal Reserve, European Central Bank, Bank of England, Bank of Japan) target inflation around 2% per year as a sweet spot — low enough to preserve purchasing power, high enough to give monetary policy room to maneuver in a downturn without hitting the zero lower bound on interest rates.

The primary lever is short-term interest rates. Raising the federal funds rate makes borrowing more expensive, slows credit growth, cools demand, and lowers inflation over a 12–18 month lag. Cutting rates does the opposite. The 2022–2024 cycle is a textbook example: the Fed raised rates from near-zero to 5.25–5.50% to bring CPI down from its 9.1% mid-2022 peak.

Secondary tools include quantitative tightening (selling assets off the central bank's balance sheet), forward guidance (signaling future rate moves to shape current expectations), and reserve requirements. These tools are blunter and operate with longer lags than rate moves.

Hyperinflation is generally defined as inflation above 50% per month. Modern examples: Weimar Germany (1923), Hungary (1946), Zimbabwe (2008), Venezuela (2018–present). It almost always traces to monetary financing of large fiscal deficits — the government prints money to pay its bills, confidence collapses, and prices race ahead of wages.

Deflation (sustained negative inflation) is rarer but equally damaging. Falling prices encourage consumers and businesses to delay purchases, which further weakens demand and creates a self-reinforcing downward spiral. Japan spent most of 1995–2015 fighting near-zero inflation; the US Great Depression (1929–1933) saw cumulative deflation of about 25%.

Stagflation is the unwelcome combination of high inflation and weak economic growth — the 1970s US experience. It is hardest to manage because the central bank's two normal tools (rate cuts to boost growth, rate hikes to fight inflation) work against each other.