US inflation

Convert US prices from one year (and month if you want) to another.

Usage

import inflation from 'us-inflation'

const current = inflation({ year: 1945, amount: 1.23 })
console.log(`$1.23 in 1945 was worth $${current} in 2017`)

Documentation

There is a single function exported by the library that has one required and one optional argument. It returns the converted price.

inflation(from, [to])

The required from argument and the optional to argument are similar objects.

from

• amount is the nominal price
• year is a year between 1913 and 2018
• month (optional) if want a more precise measure, you can supply the month the price was observed

to (optional)

• year is a year between 1913 and 2018 and is 2017 (the last full year of data) by default
• month (optional) if want a more precise measure, you can supply the month you want the new price for

Data source

All data comes from the Bureau of Labor Statistics Consumer Price Index inflation calculator and is therefore limited to years between 1913 and 2018.

Prior art and motivation

I came across @dillonchr/inflation but wanted an implementation that didn't make an HTTP request for every function call and I also wanted to figure out how to calculate inflation using the CPI.