What this calculator does
Inflation quietly changes what your money is worth: 100 soles today do not buy what 100 soles bought a decade ago. This tool measures that change for Peru using the country’s consumer price index (CPI) as published by the World Bank (indicator FP.CPI.TOTL, base year 2010 = 100). The full annual series from 1990 to 2025 is baked into the calculator, so it works entirely in your browser with no network requests.
Type an amount in soles, pick the year that money belongs to, and pick a target year. You get three answers: the equivalent amount with the same purchasing power in the target year, the cumulative inflation between the two years, and the annualized rate — the constant yearly inflation that would produce that total change. The core formula is amount × CPI[target] ÷ CPI[origin].
One Peru-specific caveat: the World Bank series technically starts in 1960, but the hyperinflation of 1988-1990 — the crisis that ended with the inti being replaced by the nuevo sol in 1991 — pushes every index value before 1990 down to virtually zero on the 2010 base. Those values lose all precision when rounded, so the selectable range starts in 1990.
How to use it
- Enter the amount in soles (S/) you want to convert.
- Choose the start year — when that money existed.
- Choose the end year — 2025, the latest available, is preselected.
You can also run it backwards: pick an end year earlier than the start year to see what a present-day amount was worth in the past.
Year-over-year inflation in Peru (2016-2025)
Computed from the same World Bank CPI series the calculator uses:
| Year | Annual inflation |
|---|---|
| 2016 | 3.56% |
| 2017 | 2.99% |
| 2018 | 1.51% |
| 2019 | 2.25% |
| 2020 | 2.00% |
| 2021 | 4.27% |
| 2022 | 8.33% |
| 2023 | 6.46% |
| 2024 | 2.01% |
| 2025 | 1.53% |
Peru spent most of the decade inside or near the central bank’s 1%-3% target range, with a clear spike in 2022-2023 during the global post-pandemic surge, followed by a quick return to low inflation in 2024-2025.
Worked example
What are S/ 500 from 2015 worth in 2025?
- CPI for 2015: 117.69. CPI for 2025: 165.52.
- Equivalent amount: 500 × 165.52 ÷ 117.69 = S/ 703.20.
- Cumulative inflation: (165.52 ÷ 117.69 − 1) × 100 = 40.64% over 10 years.
- Annualized rate: the 10th root of (165.52 ÷ 117.69), minus 1 = 3.47% per year.
So keeping the same purchasing power you had with S/ 500 in 2015 requires about S/ 703 in 2025. Over longer spans the effect compounds dramatically: S/ 1,000 from 2010 become S/ 1,655.20 in 2025 (65.52% cumulative).
Frequently asked questions
Where does the data come from and how often is it updated?
From the World Bank’s FP.CPI.TOTL indicator (consumer price index, 2010 = 100), which aggregates Peru’s official statistics produced by INEI. The series is embedded in the tool (retrieved July 2026); the World Bank refreshes it once a year, and the latest year available is 2025.
Why does the range start in 1990?
Because of the late-1980s hyperinflation. On the 2010 base, Peru’s index for 1985 is about 0.00005 and for 1980 about 0.0000014 — values so small that rounding destroys them. 1990 is the first year with a usable index value.
Is this the same as INEI’s official CPI?
It comes from the same source: the World Bank republishes the country’s official figures. Small differences versus INEI’s monthly bulletins can appear due to rounding or coverage (Metropolitan Lima versus national), but for whole-year comparisons the results are equivalent.
What does “annualized rate” mean?
It is the steady per-year inflation that, compounded across the whole period, yields the cumulative total. It lets you compare periods of different lengths: 40.64% accumulated over 10 years is the same pace as 3.47% every year.
Can I use it for US dollars?
No — this CPI tracks prices in soles inside Peru. Dollar amounts follow US inflation (and the exchange rate), which is a different series.