Inflation Calculator by Year — Purchasing Power Between Any Two Years

An inflation calculator shows how the value of money changes over time as prices rise. It works in two directions: project forward to see what today's amount will cost in the future, or look backward to see what a past amount is really worth today in current dollars. Both directions use the same compounding math that governs investment growth, just applied to rising prices instead of rising account balances — which is exactly why understanding inflation matters for any long-term financial plan, from retirement savings to setting salary expectations.

How to use this Inflation Calculator

1. 1Enter the dollar amount you want to adjust for inflation.
2. 2Choose a direction: project the amount forward to see future cost, or look backward to see what a past amount is worth today.
3. 3Enter the "from" year and "to" year for the calculation.
4. 4Select an assumed annual inflation rate. 3% reflects the long-term US historical average; the Federal Reserve targets 2% as its long-run goal.
5. 5Read the adjusted value, the change in dollar amount, and the percentage difference between the original and adjusted figures.

Inflation adjustment formula explained

Inflation compounds prices the same way interest compounds an investment — a percentage increase is applied repeatedly, year after year, so the total effect over a long period is much larger than simply multiplying the rate by the number of years. Projecting forward multiplies the amount by the compounding factor; calculating a past value divides by the same factor in reverse.

Inflation projection: $1,000 from 2000 to 2026 at 3% average inflation

1. 01Starting amount: $1,000. Years: 2026 − 2000 = 26 years.
2. 02Future cost: $1,000 × (1.03)^26 = $2,156.59.
3. 03Change in dollar amount: $2,156.59 − $1,000 = $1,156.59.
4. 04Percentage increase needed: $1,156.59 ÷ $1,000 = 115.7%.

What affects how much inflation erodes purchasing power?

Tips and things to know

• ✓Use real (inflation-adjusted) return assumptions, not nominal ones, when projecting long-term retirement or investment goals — a 7% nominal return assumption with 3% inflation is really only about 4% in today's purchasing power.
• ✓When negotiating salary or comparing pay across different years, adjust for inflation first — a salary that grew 2% per year during a period of 4% inflation actually represents a real pay cut.
• ✓Historical inflation data from the Bureau of Labor Statistics CPI is more accurate than a flat assumed rate for looking backward at specific past periods — use this calculator for forward-looking estimates and projections rather than precise historical lookups.
• ✓When setting long-term savings goals (e.g. a retirement number), build in an inflation buffer rather than assuming today's cost of living will remain flat for 20-30 years.
• ✓A 1 percentage point difference in assumed inflation rate compounds into a meaningfully different result over multi-decade projections — test a range (2%, 3%, 4%) rather than relying on a single point estimate for important financial decisions.

Inflation Calculator — bottom line

Inflation's impact on purchasing power is one of the most important financial concepts that feels abstract until you run the actual numbers. $100 in 2000 has the purchasing power of roughly $177 today — that is, you need $177 today to buy what $100 bought 24 years ago. For long-term financial planning, the inflation question is not "what does inflation do to prices?" but "what does inflation do to my savings?" Cash sitting in a savings account earning 0.5% interest while inflation runs at 3% is losing 2.5% of purchasing power per year. Over 20 years, that loss compounds into a 40% reduction in real value — your $100,000 in cash buys what $60,000 bought when you saved it. This is the invisible cost of holding too much in low-yield savings. The most common mistake is assuming that a growing nominal account balance means you are building wealth. Account balance in dollars is not purchasing power. A retirement account that grows from $500,000 to $800,000 over 20 years in a 3% inflation environment means the $800,000 has the purchasing power of roughly $443,000 in today's dollars. You need growth that outpaces inflation to build real wealth. The practical benchmark: equities have historically returned roughly 10% nominal, or about 7% after inflation. Bonds and savings accounts often fail to keep pace with inflation over long periods. Use this inflation calculator to model what any current savings goal looks like in real inflation-adjusted terms at your expected retirement date, then confirm your investment strategy is targeting returns above your inflation assumption.

Official resources and further reading