Inflation is just the price level rising over time, and the standard way to measure it is a Consumer Price Index (CPI): a basket of everyday goods and services priced each year and expressed as an index number. If the index doubles between two years, it took twice as many naira to buy the same things at the end as at the start. This calculator takes the amount and year you enter, looks up the index for that year and for the comparison year, and multiplies your amount by the ratio between them. The result is the sum that holds the same buying power in the later year's prices.
Beyond the headline figure, it shows three things people actually want to know. Cumulative inflation is the total percentage rise in prices across the span. The equivalent yearly rate is the single constant inflation rate that would produce that same total, which makes very different periods comparable. And lost value is the flip side: the share of buying power a naira shed over the period, the number that tends to surprise people most when they see a decade laid out at once.
One honest caveat about the data. The index here is reconstructed from published NBS and IMF annual-average inflation rates, and Nigeria's National Bureau of Statistics rebased its CPI in 2025, which shifts the headline series. So treat these as well-grounded estimates for a sense of scale, not audited official figures. The pattern they show, a naira that buys a small fraction of what it did ten or twenty years ago, is not in doubt. Estimates only, not financial advice.
A worked example from the series behind this page: ₦1,000,000 in 2014 needs about ₦6,812,654 in 2026 to buy the same basket, a cumulative 581% of inflation at an average of about 17.3% a year. Put the other way, money left idle since 2014 has lost roughly 85% of its buying power. Run your own amount and years above.
Method: Adjusted value = amount × (CPI of target year ÷ CPI of start year). Index reconstructed from NBS/IMF annual-average inflation, 2000 = 100, latest 2026. NBS rebased its CPI in 2025, so cross-rebasing comparisons are approximate. Estimates only, not financial advice.