How the peso value is figured
Four steps, from the two years you pick to the adjusted amount.
Choose the year your amount is from and the year you want to express it in. You can go forward in time or backward.
from and toThe calculator looks up the consumer price index for each year. The ratio between them is how much the general price level changed.
CPI ratioYour amount is multiplied by that ratio, which keeps its buying power constant. The result is the same purchasing power stated in the other year's pesos.
same valueThe result also shows the total inflation between the years, the average per year, and the reverse conversion.
both directionsWhat a peso used to buy
a long memoryThe consumer price index tracks the average price of a basket of goods and services a typical household buys. When the index rises, the same basket costs more, and that is inflation. This tool uses the World Bank's consumer price index series for the Philippines, which compiles the official Philippine Statistics Authority figures into one continuous run of annual averages on a 2010 equals 100 base, covering 1989 to the latest full year.
Comparing the index in two years tells you how the peso's buying power changed. Suppose the index stood at 50 in your from year and reached 100 in 2010. The ratio of 100 to 50 is 2, so an amount doubles: ₱100 becomes ₱200 with the same purchasing power. The tool looks up the index for both years you pick, takes that ratio, and multiplies your amount by it, whether you move forward or backward in time.
The result also shows the total inflation between the years, the average per year, and the reverse conversion. It only looks backward, comparing years that already have published values, so it cannot forecast next year's prices. Small gaps from other calculators are normal and come from the base year, monthly versus annual figures, and rounding. To see how savings might grow against rising prices, the compound interest calculator helps, and the take-home pay calculator works from today's wages.
Questions people ask
answered in plain wordsEnter 100, set the from year to 1990 and the to year to the latest, and the calculator shows the equivalent amount today. Prices in the Philippines have risen many times over since 1990, so ₱100 back then had the buying power of several hundred pesos now. The exact figure updates as new yearly averages come in.
The calculator uses the World Bank's consumer price index series for the Philippines, which compiles the official figures from the Philippine Statistics Authority into one continuous run. The values are annual averages on a 2010 = 100 base and cover 1989 to the latest full year.
The CPI tracks the average price of a basket of goods and services a typical household buys. When the index rises, the same basket costs more, which is inflation. Comparing the index in two years tells you how much the peso's buying power changed between them.
Small differences are normal. They come from the base year used, whether the figures are annual averages or a specific month, which basket revision applies, and rounding. This tool uses annual averages, so it answers 'across the whole year' rather than 'on a specific date.'
No, they are typical figures for their year, the jeepney fare or the sari-sari store softdrink as most people remember them, rounded for recognition. Prices varied by place and month, so treat a preset as a starting point for the comparison, not a historical record. You can always type an amount you remember more precisely.
No. It only looks backward, comparing years that already have published index values. It cannot forecast next year's prices, and future inflation may differ from the past.
No. Every calculation runs privately on your device. Nothing you type is stored, tracked, or sent to a server.
Where these numbers come from
straight from the sourceThe rates and rules on this page follow the official issuances below. When an agency updates a schedule, this is where to confirm the current figure against your own situation.