# Inflation calculator

## Ingress

The basis for the computations are the monthly consumer price indices from Statistics Norway, see The consumer price index.

## Calculate the price change

The latest available figures are for August 2023. Figures for September are released around October 10.

## Examples of calculations

In use of the indexes for adjustment purposes, sometimes there is a need to calculate the percentage change in the index for a specific period of time.

The following example shows the percentage change from August 2018 to March 2021 for Consumer Price Index:

August 2018: 108.9 (index)

March 2021: 114.6 (index)

Increase in percentage: ((114.6 / 108.9) - 1) * 100 = 5.23

The increase in Consumer Price Index from August 2018 to March 2021is approximately 5.2 percent.

Increase in percentage: 5.2

Amount to be adjusted: NOK 1000

Increase: (1000 * 5.2) / 100 = 52

New amount: NOK 1000 kr + NOK 52 = NOK 1052

Alternative calculation method: 1000 * 114.6 / 108,9 = 1052.34

New amount after adjustment is approximately NOK 1052

In some cases, users need to change the base year. The example below show how we converted from the base index 2015= 100 to the new base index 2020= 100 for the index value per March 2021.

Average 2020: 112.2 (index)

March 2021: 114.6 (index)

Index value per March 2021 with base 2020 = 100 equals: (114,6 / 112.2) * 100 = 102.1