Inflation Calculator

A price tag from another year needs context

What does inflation mean when you compare two dollar amounts? It means the same number can pay for a different share of the typical consumer basket at each date. A television or a gallon of gas may move differently, but CPI measures a broad average of household prices. What is inflation, then, in practical terms? It is the change in that overall price level, not proof that every item rose by the headline percentage.

A value of money calculator takes a past amount and scales it by the CPI change. A money value calculator can also work between two historical months instead of always ending today. If the index moves from 200 to 250, $800 at the starting date corresponds to $1,000 at the ending date. No dollars are earned in this example; the larger figure represents comparable general purchasing power.

The ratio behind the result

How to calculate inflation between two dates comes down to one ratio:

Inflation rate (%) = ((Ending CPI / Starting CPI) − 1) × 100

The ending index divided by the starting index is also the price multiplier. A multiplier of 1.25 means the general price level rose 25%, so an original $2,000 becomes $2,500 in end-date dollars. “Past to Now” uses the newest month found in the selected series. “Between Two Dates” is better for a lease term, a salary review period, or a fixed stretch of an investment record.

Monthly inflation and annual inflation answer different questions

Monthly inflation compares one month with the month immediately before it. Annual inflation compares a month with the same month one year earlier. Monthly inflation rates can be negative while annual inflation rates remain positive, because the two windows contain different observations. Adding twelve monthly percentages is not exact either; the monthly moves compound on changing index levels.

An inflation difference is not the purchasing power loss

If prices double, the inflation difference is 100%, yet the original amount loses 50% of its buying power. That is why the result displays both measures. An inflation difference calculator reports movement in the price level. Purchasing power loss uses 1 minus the reciprocal of the multiplier. During deflation, the tool switches the latter label to purchasing power gain and keeps the price change negative.

One currency, one official price series

The currency menu does not perform foreign exchange. USD stays in dollars and follows U.S. prices; EUR stays in euros and follows the euro-area basket. Mixing a BLS index level with a Eurostat level would produce a meaningless ratio, even if both are called consumer price indexes.

Index agencies sometimes change a base year. Eurostat moved HICP to 2025=100 while the euro area expanded to 21 members. TUIK also publishes its current CPI on a 2025 base. Rescaling an index changes the displayed level, but not a ratio built from correctly linked months. For long lira spans, the result therefore calls its levels a CPI Comparison Index rather than presenting them as unchanged raw values from one base.

The dollar inflation calculator follows CPI-U

Dollar inflation is measured here with the BLS all-items CPI-U series. In July 2026, its unadjusted index level was 333.918 and the 12-month increase was 3.4%. A dollar inflation calculator answers questions about U.S. consumer prices, such as how a historical salary compares with a later salary. It does not measure the return from holding dollars in another country, and it does not include exchange-rate movement.

How to read the 2026 figure without overstating it

The phrase “2026 inflation rate” may refer to the latest 12-month reading, a month-to-month change, or the eventual calendar-year average. Those are separate statistics. The 2026 inflation figure available in August is not a completed full-year outcome. For the United States, the latest annual reading in this tool's verified series is the 3.4% change through July.

What is the inflation rate for your own period? Select the exact starting and ending months. A January-to-July result will differ from the July annual rate because it covers fewer months. The note above the calculate button states the last loaded month for the selected currency, which prevents a release lag from being mistaken for a zero change.

An inflation expectation is a forecast or survey measure, not a realised CPI observation. Expectations can affect wage bargaining, pricing, and interest-rate decisions, but this calculator does not project future prices. It works only with published monthly index values from the named statistical agencies.

Useful comparisons beyond the headline rate

A 6% pay raise during a period with 4% price growth does not produce exactly 2% real growth. The ratio (1.06 / 1.04) − 1 gives about 1.92%. The same logic applies to savings: compare the nominal account return with the CPI movement over identical dates. Tax, fees, and investment risk still need their own calculations.

Historical budgets offer another use. You can ask what a $500 grocery budget from an earlier month corresponds to now, or place two project estimates on a similar purchasing-power basis. CPI is not the right index for every contract. Housing, medical care, tuition, and construction costs can depart sharply from the all-items basket, so a specialized index may be more relevant.

• Use “Past to Now” for a historical amount whose present CPI equivalent you want.
• Use “Between Two Dates” for a closed period with a known start and finish.
• Enter English-formatted amounts such as 1,234.56; malformed mixed separators are rejected.

The output is a purchasing-power comparison, not a market valuation or financial recommendation. Personal inflation can also differ from CPI when a household spends much more than average on rent, energy, food, or health care. The official index remains useful because it provides a consistent public benchmark across time.