US Inflation & Purchasing Power Calculator (2026)
Calculate historical US dollar inflation, changes in purchasing power from 1990 to 2026 using CPI data, cumulative price change, and future inflation impact.
United States Calculator
Adjust Your Inputs
Move the sliders or type exact numbers. Results update instantly.
Instant Estimate
Your Results
Equivalent Purchasing Power Today / in Target Year
$188
Based on your selected inflation calculator assumptions. Try different sliders to compare scenarios.
Cumulative Price Increase (Inflation %)
88.15%
Purchasing Power of Original $1
$53
Average Annual Inflation Rate
2.46%
Years to Halve Purchasing Power (Rule of 72)
29
These calculations are financial projections and planning estimates, not tax, legal or licensed financial advice. 2026 IRS thresholds and mortgage lender rates vary by location.
How to Use the Inflation Calculator
Enter starting dollar amount
Input any historical dollar amount (e.g. $100, a starting salary, or home price).
Select historical base year
Choose any year from 1990 to 2024 to reference official BLS Consumer Price Index (CPI-U) data.
Select target or future year
Choose 2026 for current purchasing power, or project ahead to 2030, 2035, or 2040.
Review inflation erosion & Rule of 72
See equivalent dollar purchasing power, cumulative inflation percentage, and how quickly your money halves in real value.
Formula & Calculation Methodology
Adjusted Value = Initial Amount × (End CPI / Start CPI) | Loss in Purchasing Power = (1 - (Start CPI / End CPI)) × 100This calculator uses standard United States financial formulas, IRS thresholds, and amortization schedules. All results compute instantly in your browser with zero data stored or transmitted.
Calculation Examples & Scenarios
$100 in 2000 vs 2026
$100 in 2000 (CPI 172.2) compared to 2026 (CPI ~324.0).
$50,000 Household Income in 1990
$50,000 salary in 1990 (CPI 130.7) adjusted to 2026.
Key Benefits
- Based on official Bureau of Labor Statistics (BLS) Consumer Price Index (CPI-U) data
- Enables accurate historical wage, home price, and purchasing power comparisons across decades
- Projects future purchasing power erosion using custom forward-looking inflation rates
Common Use Cases
- Retirees calculating real purchasing power of fixed pensions over 20- to 30-year horizons
- Professionals negotiating salaries against long-term cost-of-living increases
- Investors benchmarking portfolio returns against real inflation hurdles
How the Consumer Price Index (CPI) Measures Inflation
The Consumer Price Index (CPI-U) tracks price changes across a representative basket of goods and services including shelter, energy, groceries, healthcare, and education. When the CPI increases, each dollar buys a smaller percentage of a good or service.
The Rule of 72: When Does Cash Lose Half Its Value?
The Rule of 72 is an indispensable rule of thumb for estimating purchasing power decay. Divide 72 by the annual inflation rate: at 3% inflation, cash loses 50% of its real purchasing power in 24 years (72 / 3 = 24). At 7% inflation, that halving occurs in just over 10 years.
Frequently Asked Questions
The Consumer Price Index (CPI) is published monthly by the Bureau of Labor Statistics (BLS). It measures the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services including food, energy, housing, apparel, transportation, and medical care.
Due to cumulative inflation of approximately 88%, $100 in the year 2000 has the same buying power as roughly $188 in 2026, meaning prices have nearly doubled over the 26-year span.
The Rule of 72 is a quick mental math formula. Dividing 72 by the annual inflation rate tells you how many years it will take for your money to lose half of its purchasing power. At a 3% inflation rate, purchasing power is cut in half every 24 years (72 / 3 = 24).
Historically, the most effective hedges against inflation include broad equity index funds (S&P 500), real estate (which benefits from rising rents and property values), Treasury Inflation-Protected Securities (TIPS), and businesses with strong pricing power.
Headline CPI measures total price changes across all goods and services. Core CPI strips out food and energy prices, which are notoriously volatile, giving economists and the Federal Reserve a clearer view of underlying long-term inflationary trends.
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