Inflation calculator FAQ

The Yearly Inflation Calculator is a free online tool that shows how inflation changed the value of money between any two years. You choose a country, enter an amount, pick a start year and an end year, and it returns the inflation-adjusted value along with cumulative inflation, the average annual rate and the change in purchasing power. It uses official Consumer Price Index data rather than a guessed rate, and covers 192 countries.

Four steps. First, select a country from the dropdown — this sets the price index and the currency. Second, type the amount you want to convert. Third, choose the starting year, which is the year the money belonged to. Fourth, choose the ending year you want it expressed in. The result updates instantly: no button to press, no sign-up, and nothing to install. You can also use the quick range buttons for common periods, swap the two years with the arrow button, and copy a link that reopens the exact result you are looking at.

Yes. It is completely free, with no account, no login and no usage limits. The calculation runs entirely in your browser, so nothing you type is sent to a server or stored anywhere.

The Future value tab projects an amount forward at a fixed rate you choose, pre-filled with the selected country’s long-run average as a starting point. That is an assumption rather than a measurement, because nobody can know future inflation. The Between two years tab is the one backed by real published data.

It depends on the inflation rate you assume, and the question has two readings. If inflation runs at India’s long-run average of about 7.2% a year, then something costing ₹1,00,000 today would cost roughly ₹8,06,907 in 30 years. Read the other way, ₹1,00,000 held as cash for 30 years would buy only about ₹12,393 worth of today’s goods — roughly 12% of its current purchasing power. At 6% a year the future cost is about ₹5,74,000; at 8% it is about ₹10,06,000. Use the Future value tab to test any rate you like.

Inflation is calculated from a price index, usually the Consumer Price Index. Take the index value at the end of the period, subtract the index value at the start, divide by the index value at the start, and multiply by 100. If the index moved from 120 to 126, inflation was (126 − 120) ÷ 120 × 100 = 5%. The index itself comes from pricing a fixed basket of goods and services repeatedly over time.

The inflation rate formula is: inflation % = ((CPI in the later period − CPI in the earlier period) ÷ CPI in the earlier period) × 100. Equivalently, inflation % = (CPI_later ÷ CPI_earlier − 1) × 100. Both give the same answer; the second form is easier to chain across multiple years.

To convert an amount from one year into another year’s money, the formula is: adjusted value = amount × (CPI in end year ÷ CPI in start year). This is the calculation behind every result on this site. Because both index values come from the same series, the base year the index is anchored to cancels out, so an index running 60 → 120 gives exactly the same answer as one running 100 → 200.

For a single year, the annual inflation rate compares that year’s index with the previous year’s: rate % = (CPI_this_year ÷ CPI_last_year − 1) × 100. Across a longer period, the average annual rate is the geometric mean — the constant rate that compounds to the same total: annual % = ((CPI_end ÷ CPI_start) ^ (1 ÷ number of years) − 1) × 100. It is deliberately not the simple average of the yearly rates, which would overstate the result because inflation compounds.

Cumulative inflation is the total price change across the whole period. Average annual inflation is the constant yearly rate that would compound to the same total. In the United States, +140.1% cumulative inflation between 1990 and 2024 works out at only +2.61% a year. The gap between those two numbers is compounding, and it is why a rate that sounds trivial annually is enormous over a lifetime.

Purchasing power shows how much of the original buying power is left. If it reads 40%, money from the start year buys 40% of what it used to — the other 60% was eroded by rising prices. It is the reciprocal of the adjustment ratio: power % = (CPI_start ÷ CPI_end) × 100. For example, $100 from 1990 retains about 42% of its purchasing power today.

Price inflation is a sustained rise in the general level of prices across an economy over time. It is not one item getting more expensive — that is a relative price change. Inflation is the broad movement of the whole basket, which means each unit of currency buys less than it did before. It is measured by tracking the cost of a representative basket of goods and services, and expressed as a percentage change per year.

Inflation rises when demand grows faster than an economy’s ability to supply goods and services, or when the cost of producing those goods increases. In practice that means: consumers and governments spending more (demand-pull); wages, energy, raw materials or shipping becoming more expensive (cost-push); rapid growth in the money supply; a currency weakening so imports cost more; and supply shocks such as poor harvests, conflict or disrupted trade routes. Expectations matter too: if businesses and workers expect prices to rise, they raise prices and ask for higher wages, which makes the expectation self-fulfilling.

Economists group the causes into three primary categories. Demand-pull inflation happens when total demand outruns available supply — too much money chasing too few goods. Cost-push inflation happens when production becomes more expensive through higher wages, energy or imported input costs, and firms pass that on. Built-in or expectations-driven inflation happens when past price rises get baked into wage settlements and pricing decisions, creating a self-sustaining cycle. Monetary policy sits behind all three: central banks raise interest rates to cool demand and lower them to stimulate it.

Most central banks in developed economies target around 2% a year, and many treat a band of roughly 2–3% as healthy. That is low enough that prices stay predictable and savings are not rapidly eroded, but high enough to keep a safe distance from deflation and to give policymakers room to cut interest rates in a downturn. Emerging economies often target a somewhat higher figure, commonly 4–6%, reflecting faster growth and structural change. What matters as much as the number is stability: a steady 4% is easier to plan around than a rate swinging between 0% and 10%.

No. Low, stable and predictable inflation is generally considered healthy. It encourages spending and investment rather than hoarding cash, it lets employers adjust real wages without cutting nominal pay, and it erodes the real burden of existing debt, which helps borrowers. What is harmful is inflation that is high, volatile or unexpected: it destroys savings, makes long-term planning impossible, and hits people on fixed incomes hardest. The opposite extreme — falling prices — is usually worse still, because it encourages people to delay purchases and can lock an economy into a downward spiral.

Zero inflation means the general price level did not change over the period — the price index ended where it started. It sounds ideal, but most central banks deliberately avoid targeting it. At zero there is no buffer against slipping into deflation, employers cannot quietly reduce real wages during a downturn without cutting pay outright, and interest rates have less room to fall before hitting zero. A small positive rate is treated as the safer setting.

Deflation is the opposite of inflation: a sustained fall in the general price level, so money buys more over time rather than less. It sounds attractive but is usually a warning sign, because it tends to accompany weak demand. If people expect prices to keep falling they postpone purchases, which weakens demand further, and the real burden of debt rises even as incomes fall. This calculator handles deflation correctly — when prices fell between your two years the adjusted value comes out lower than the amount you entered, cumulative inflation is negative, and purchasing power reads above 100%.

Inflation is a rate of change; the cost of living is a level. Inflation measures how fast the price of a fixed basket is rising, holding the basket constant so the comparison is like-for-like. The cost of living is what it actually costs to maintain a given standard of living in a particular place, and it changes with housing, tax, local wages and lifestyle as well as prices. Two cities can share a national inflation rate of 3% while having wildly different costs of living. Inflation also describes an average household — if your own spending is concentrated in housing, education or healthcare, your personal cost of living can rise much faster than the headline rate.

Four, and all of them are deliberate. First, it uses annual average Consumer Price Index values, not monthly figures, so a period is measured calendar year to calendar year. Second, it treats the published national CPI as the measure of inflation, which reflects an average household basket rather than your personal spending. Third, average annual rates are geometric means, so compounding is handled correctly. Fourth, the Future value tab compounds one fixed rate you supply and assumes it holds for the whole period — that tab is a scenario, not a forecast. The historical tab makes no assumption about the rate at all; it reads the published index for both of your years.

All figures come from the World Bank’s Consumer Price Index series (indicator FP.CPI.TOTL), which compiles the official CPI published by each country’s national statistics agency — the Bureau of Labor Statistics in the United States, the Office for National Statistics in the United Kingdom, MoSPI in India, and so on. The data is annual. It is built into the site rather than fetched live, so results are fast and stable.

Countries began publishing a consistent Consumer Price Index at different times, and some series have gaps where no figure was published. The year menus only ever offer years that have a published figure for the country you have selected, so you cannot pick a year the data does not support.

National calculators often compare specific months, or use a variant index, while this tool compares annual averages. Statistics agencies also revise and re-base their series periodically. Differences of a fraction of a percent are normal and expected; the magnitude and direction of the result will always agree.