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Inflation Calculator

Compare an amount across published 2000–2025 BLS CPI-U annual averages or model a clearly labeled constant-rate inflation scenario in either direction.

Use this result well

Inputs that matter
Amount plus either two supported annual-average CPI-U years or a constant annual rate and signed year direction
Output to expect
Equivalent amount, cumulative price change, annualized change, purchasing-power context, and an auditable year-by-year path
How it works
Historical mode uses the direct ratio of BLS CPI-U U.S. city average annual indexes for 2000–2025; scenario mode compounds one user-entered constant annual rate
  • Historical CPI years stop at the latest published annual average and never fill missing or future years with an assumed rate.
  • A constant-rate projection is a scenario, not a forecast; CPI-U may not match a household, region, or specific product basket.

Choose your path

Built around the job you need to finish

Compare money across published CPI-U annual-average years or explore a clearly labeled constant-rate inflation scenario without mixing historical data and forecasts.

Historical purchasing-power researcher

Translate an amount between two published CPI years.

Choose historical CPI-U mode, select two supported years, and inspect the index ratio and yearly path.

Can reproduce the result from the displayed BLS indexes and sees no estimated future year presented as history.

Forward scenario planner

Stress-test a future cost with a constant inflation assumption.

Choose custom-rate mode, enter amount/rate/year direction, and compare equivalent amount and purchasing power.

Understands the fixed rate is a scenario rather than a forecast and reverse direction uses the reciprocal factor.

Mobile fact checker

Verify source and direction quickly on a phone.

Swap years, open the CPI reference, and inspect the compact breakdown.

All controls remain named/tap-sized and the displayed source and year basis are unambiguous.

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Projects using Inflation Calculator

This tool is part of these guided projects. Each project provides step-by-step instructions with checklists and all the tools you need in one place.

Plan for Retirement

Build a versioned retirement scenario from current records, benefit evidence, entered assumptions, plan terms, fees, risk decisions, and review triggers.

7 steps4 toolsStart project

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Reference & details

How it works

Future Value with Inflation

Inflation erodes purchasing power over time. The same dollar amount buys less as prices rise.

Future Value = Present Value × (1 + Inflation Rate)^Years

Real vs Nominal Value

Real value adjusts for inflation to show true purchasing power. Nominal value is the face amount without adjustment.

Real Value = Nominal Value ÷ (1 + Inflation Rate)^Years

Historical CPI-U annual averages

Historical mode uses the direct ratio of BLS CPI-U U.S. city average annual indexes. Reverse comparisons use the reciprocal ratio, and unsupported or future years are not filled with assumed inflation.

Equivalent Amount = Amount × (End-Year CPI-U Index ÷ Start-Year CPI-U Index)

Updated: August 2026

Example Scenarios

Estimating how much $50,000 in today's dollars will need to be in 2046 to maintain the same purchasing power.

Today's Value: $50,000Inflation: 3%Years: 20

→ Equivalent future amount: ~$90,300

Compare $100 using the published CPI-U annual-average indexes of 172.2 for 2000 and 321.943 for 2025.

Amount: $100Start index: 172.2 (2000)End index: 321.943 (2025)

→ 2025 equivalent: about $186.96

Swap two supported CPI years to verify that the reverse factor is the reciprocal of the forward comparison.

Common Mistakes to Avoid

Using nominal returns for retirement projections

A 7% investment return with 3% inflation yields only 4% real return. Plan retirement income needs in today's dollars, then inflate the target.

Assuming inflation affects all expenses equally

Healthcare, education, and housing often inflate faster than CPI. Budget categories may need different inflation assumptions than the general rate.

FAQ

Historical arithmetic is reproducible from the displayed BLS annual-average indexes. CPI-U is a broad U.S. city-average measure and may not match your household, region, or product basket; fixed-rate mode is only a scenario.

Yes, our Inflation Calculator is completely free with no registration required. There are no usage limits, hidden fees, or account setup — just open the tool and calculate.

Yes, the Inflation Calculator is fully responsive and works on all devices including phones, tablets, and desktops. All calculations run in your browser for fast, private results.

Historical mode compares published 2000–2025 CPI-U annual-average indexes. Custom mode compounds one constant annual rate forward or backward and shows the year-by-year factor.

Yes. Swap historical years to audit the reciprocal comparison, or change one constant-rate assumption at a time. Do not mix a custom scenario with the historical BLS series.

About Inflation Calculator

Compare published U.S. CPI-U annual averages or explore a fixed-rate scenario locally in your browser. Historical mode cites its index basis; scenario mode is not a forecast.