How to Adjust a Dollar Amount for Inflation Using CPI

To adjust for inflation with CPI, multiply a dollar amount by the ratio of the Consumer Price Index in the year you want to express it in to the CPI in the year the amount is from. That single ratio lets you compare a salary from 2000 with one today, see what a past price would cost now, or convert a future goal into today's dollars. This guide explains the formula, works through examples using the CPI-U values in our inflation calculator, and covers the common pitfalls.

What CPI is

The Consumer Price Index is published by the US Bureau of Labor Statistics. It tracks the prices of a broad basket of goods and services that households buy, including housing, food, transportation, medical care and more. The most widely quoted version is CPI-U, the index for all urban consumers. The index is set so that the average for 1982 to 1984 equals 100. A CPI of 300 means prices are about three times their 1982–84 level.

The BLS publishes monthly figures and annual averages. Our calculator uses annual averages, which smooth out month-to-month swings and are the usual choice when comparing amounts across years. The latest year in our table is an estimate that is updated as official data arrive, so the examples in this guide stop at 2025.

The formula

The ratio works in both directions. To move an amount forward in time, the ratio is above 1. To move it backward, the ratio is below 1.

Example 1: is a 2000 salary worth more today?

Suppose someone earned $50,000 in 2000. Using the CPI-U annual averages of 172.2 for 2000 and 322.029 for 2025:

To have the same purchasing power in 2025, that salary would need to be about $93,504. Cumulative inflation over the period was 87%, an average of 2.54% a year. Put another way, a dollar in 2025 bought about 53.5% of what a dollar bought in 2000.

Example 2: an old price in today's dollars

A $20 item in 1980 would cost about $78.16 in 2025 dollars, if its price had risen exactly with CPI. Individual prices do not all follow the index; some rise faster, others fall. The CPI conversion tells you what the same amount of general purchasing power would cost, not what that specific item costs today.

Example 3: did your raise beat inflation?

Suppose your salary was $60,000 in 2020 and is $66,000 in 2025. In nominal terms that is a 10.0% raise. To keep the same purchasing power, though, $60,000 in 2020 would need to be about $74,656 in 2025. The new salary is below that level, so purchasing power actually fell by about $8,656 a year in 2025 dollars, despite the raise. Our pay raise calculator shows the nominal side of a raise, and the guide on pay raise percentages explains how to read them.

Year-by-year CPI since 2016

For recent years our table has annual values, so you can see inflation year by year. The last column is the multiplier that converts a dollar from that year into 2025 dollars.

The multiplier column is handy: multiply any amount from the left-hand year by it to restate the amount in 2025 dollars. It also shows how uneven recent inflation was, with a few years doing most of the work.

Adjusting a whole series

Inflation adjustment becomes most useful when you apply it to a series of numbers, such as your income over several years, a household budget category, or the price of a recurring bill. Convert every value to the same base year, and the trend you see is the real trend. Here is an example income history:

In nominal terms the income rose every time. In 2025 dollars, the picture is actually flat or down, showing that the raises did not keep up with prices. Restating a series like this, with every figure in the same year's dollars, is the clearest and most honest way to judge whether you are getting ahead.

Doing it in a spreadsheet

Put years in one column, nominal amounts in the next, and the CPI for each year in a third. In a fourth column, divide the base-year CPI by each row's CPI and multiply by the amount. Fix the base-year CPI with an absolute cell reference so you can fill the formula down. If you change the base year, every row updates at once. Keep the source of your CPI figures noted in the sheet, since revised or updated data can change the results slightly.

Inflation-adjusting goals and budgets

The same idea works in reverse when planning. If your household budget today is a certain amount and you want to know what it will take in ten years, apply an assumed rate. If you want to know whether last year's budget increase was real growth or just inflation, compare it with the CPI change for the same period. For emergency savings, our guide on how much emergency fund you need recommends revisiting the target each year partly for this reason.

Going backward in time

To express a current amount in older dollars, swap the CPIs. $100 in 2025 had the purchasing power of about $40.59 in 1990. This is useful when you want to compare a modern price with a historical benchmark in the old dollars, for example when reading an old article or contract.

$100 across the decades

Inflation was not steady

Average annual inflation for each span, from the same CPI table:

These averages show how much inflation has varied from one decade to the next. When you convert across a long period, remember that the result reflects all those different stretches combined. For projecting the future, a single long-run average is a reasonable starting point, but testing a higher rate is wise.

Projecting forward

CPI only exists for the past. To estimate future costs, use an assumed inflation rate instead:

At an example 3% rate, something that costs $50,000 today would cost about $90,306 in 20 years, and each of today's dollars would buy about 55.4% as much. This is how our inflation calculator's future mode works. Our guide to real vs nominal returns shows how to combine an inflation assumption with an investment return.

Where CPI adjustment is used in real life

Inflation indexing is built into many parts of the US financial system. Social Security benefits receive cost-of-living adjustments tied to a CPI measure (CPI-W). Many federal tax brackets, the standard deduction and retirement account contribution limits are adjusted for inflation each year using a chained CPI measure. Treasury Inflation-Protected Securities and Series I savings bonds use CPI-U. Some leases, wage contracts and child support orders include CPI escalation clauses. Knowing the formula lets you check these adjustments yourself.

Which CPI should you use?

The BLS publishes several related indexes:

• CPI-U: all urban consumers, the most common headline measure.
• CPI-W: urban wage earners and clerical workers, a subset of CPI-U households.
• Chained CPI-U (C-CPI-U): adjusts for how consumers substitute between goods when relative prices change. It tends to rise a little more slowly.
• Core CPI: excludes food and energy, which are volatile. It is useful for analyzing trends, not for adjusting household budgets, since households do pay for food and energy.

For most personal comparisons, CPI-U annual averages are the standard choice. If a contract or law names a specific index, use that one.

Monthly vs annual figures

If you are adjusting an amount from a specific month, such as a lease signed in March, use the monthly CPI for that month and the most recent month. Monthly CPI-U figures are published not seasonally adjusted and seasonally adjusted; for converting amounts, the not seasonally adjusted series is normally used. For annual salaries, annual averages are usually more appropriate because the salary was earned across the whole year.

Limitations of CPI adjustment

1. Your basket is not the average basket. If you spend more on categories that inflate faster, such as rent in a high-cost city, your personal inflation may be higher than CPI.
2. Quality changes. A computer today does far more than one from 2000. The BLS adjusts for some quality changes, but comparisons of specific products over long periods are imperfect.
3. New products. Many items people buy today did not exist decades ago, so long comparisons describe general purchasing power rather than identical lifestyles.
4. Geography. National CPI hides regional differences. The BLS publishes regional and metro-area indexes for more local comparisons.
5. Revisions and estimates. Recent figures may be estimates. Our table marks the current year as an estimate.

Questions CPI adjustment can answer

Once you know the ratio, many everyday questions become quick calculations:

• Was my first salary higher than I remember? Convert it to current dollars and compare it with what you earn now.
• Is my rent increase above inflation? Compare the percentage increase with the CPI change over the same months.
• How much should I raise a gift, allowance or donation to keep it constant? Multiply last year's amount by the CPI ratio between the two years.
• Did a fund or account actually grow? Restate the starting balance in current dollars and compare it with today's balance, after removing new deposits.
• What would a historical price be today? Convert old prices from documents, family records or news stories to current dollars to put them in context.

In each case, the result is an estimate of equivalent general purchasing power. It is a strong, transparent starting point for a decision, not a precise measure of your own costs.

A step-by-step checklist

1. Write down the amount and the year it is from.
2. Choose the year you want to express it in.
3. Look up CPI-U for both years, using annual averages for annual amounts.
4. Multiply the amount by the ratio, target CPI over original CPI.
5. Optionally, compute cumulative and average annual inflation to describe the change.
6. Interpret the result as general purchasing power, not the price of a specific item.
7. Note the CPI values and the data date you used, so the calculation can be repeated, checked by someone else, or updated when newer figures are published.

The inflation calculator does steps 3 to 5 automatically for any pair of years in its table, and it also projects future amounts at an assumed rate.

Key takeaways

Adjusting for inflation with CPI takes one ratio: multiply by the target year's CPI divided by the original year's. Using CPI-U annual averages, $50,000 in 2000 corresponds to about $93,504 in 2025, and $100 from 1980 to about $391. Use the same approach to check whether your raises beat inflation, to compare historical prices, and, with an assumed rate, to plan future costs. For savings and investment decisions, pair it with the CD calculator and the guide on real vs nominal returns to see what your money earns after inflation.