Inflation calculator
What your soles, pesos, euros or dollars from another year are worth today, using each country’s official price index.
- 100% free
- No sign-up
- Your amounts never leave your device
- Export to CSV and PDF
Pick a country, type an amount and the starting month: the calculator uses the official monthly consumer price index (CPI) to tell you how much you need today to buy the same things, how much inflation there was between the two dates and what it averaged per year. It also works backwards: what today’s amount was worth in the past. Data comes from INEI (via BCRP), INEGI, INDEC, DANE, INE Chile, INE Spain and the BLS, and the source and last published month are shown under the result.
How it works
Pick the country and amount
Peru, Mexico, Argentina, Colombia, Chile, Spain or the United States, and the amount in its currency.
Pick the two months
The starting and ending month; by default, the latest month with official data. "Swap" asks the question backwards.
Read the result
The equivalent amount, cumulative and average annual inflation, a month-by-month chart and the data source.
What makes it different
Official data
Each statistics office’s monthly CPI, with the series and date in view. Nothing typed by hand.
Month by month
Not just by year: pick the exact month you had that money.
Both directions
What an old amount is worth today, or what today’s amount was worth back then.
In plain words
Besides the numbers, one sentence that explains what the result means.
CSV and PDF
The month-by-month series ready for Excel or to save and print.
Private
The calculation runs in your browser. No account, and your amounts are not stored.
What it’s for
See what your savings are worth
If you saved money years ago, see how much buying power it lost.
Compare salaries across years
A 2015 salary and today’s, in the same money of today.
Check a rent increase
A reference for how much rent would have risen with inflation alone.
House or car prices
What you paid years ago, in today’s prices.
Homework and reports
Citable official data for economics classes or reports.
Plan with real inflation
See your country’s average inflation before modeling an investment.
Compared with other calculators
Official calculators usually cover one country and one question. This one brings seven countries together with the same logic and shows where every number comes from.
- Seven countries in one place, each with its official CPI.
- For the US it matches the BLS calculator (same CPI-U series).
- Cumulative and average annual inflation together, with a month-by-month chart.
- Ask in both directions: forward to today or backwards.
- Export the series to CSV or PDF and share the calculation with a link.
Frequently asked questions
How much is $100 from 2000 worth today?
Pick the United States, type 100 and January 2000 (or any month): the calculator uses the BLS CPI-U and gives the equivalent in the latest published month. The answer changes every month, so we don’t hard-code it here.
How is inflation between two dates calculated?
Divide the price index of the final month by that of the starting month: today’s value = amount × final CPI ÷ starting CPI. Cumulative inflation is that ratio minus 1, and average annual inflation is the ratio raised to 12 divided by the number of months, minus 1.
Where does each country’s data come from?
Peru: INEI via BCRP (series PN38705PM). Mexico: INEGI/Banxico INPC via CEPALSTAT. Argentina: INDEC national CPI. Colombia: DANE CPI via CEPALSTAT. Chile: INE CPI via CEPALSTAT. Spain: INE CPI. United States: BLS CPI-U. The exact series, base and last published month appear under the result.
Why does Argentina only start in December 2016?
That’s when INDEC’s official national series begins. There’s no continuous official series before it: 2007–2015 data was disputed and the index was rebuilt, so we don’t mix them.
Does it match the BLS inflation calculator?
Yes. For the US it uses the same CPI-U series and matches the BLS calculator to the cent; for the other countries, annual inflation matches what each statistics office publishes. Tiny differences can come from rounding.
Can I use it to adjust rent, a debt or a salary?
It’s a good reference for how much prices rose. Many contracts use their own index (UF in Chile, UVA in Argentina, UDI in Mexico, CPI-W or a specific clause), so for a legal adjustment check which index your contract names.
What about a month that was never published?
If the source skipped a month (for example, BLS did not publish October 2025 because of the US government shutdown), it is estimated from the neighboring months and the calculator tells you when your period includes it.
Are my amounts stored?
No. The calculation runs in your browser with data that ships with the page; no amount is sent or saved.