What a past amount costs today
Measured from the published consumer price index, month by month.
The amount you type stays in your browser. Only the currency is sent, to load its index.
Your figures
What something cost, or what you earned, in the start month.
How it counts
The consumer price index tracks what a basket of everyday goods and services costs. The amount is multiplied by the end month's index and divided by the start month's. Both months must be published; nothing here is a forecast.