North Carolina Public Library Data

Library inflation calculator

Use this calculator for public, academic, or special library data! Using inflation-adjusted data in your advocacy will have a stronger impact than showing the change in dollar value alone. Adjusting for inflation takes into account the rising cost of library management over time. Using per capita data additionally expresses what this revenue means in per person spending ability from year to year. This calculator takes data about past and current library money (revenue, state aid, etc.) and adjusts for inflation by converting the historic data to the most current year's data. It also calculates the percentage difference between the inflation-adjusted values and calculates per capita revenue. See the bottom of the page to learn how this is calculated.

Year of historic data:
Input historic data ($): No commas
Input current data ($): No commas
Optional (for per capita analysis)
Input historic population: No commas
Input current population: No commas

HOW THIS IS CALCULATED: The calculator uses the U.S. Bureau of Economic Analysis' Table 3.15.4 "Price Indexes for Government Consumption Expenditures and Gross Investment by Function", State and Local, Libraries and Other data, to adjust for inflation. To date, 2011 is the most current inflation index that has been released. Updated indices should be released by the end of January 2013. This update includes a revision of all past indices that occurs once every five years and adjusts for accuracy, so after the revised data is uploaded to the calculator in early 2014 you may notice small changes to prior calculations.