You will find some calculators here which might be useful for helping you to make calculations. For example, questions might arise about how much rent can be increased by in accordance with the Consumer Price Index, cf. Section 4-2. If a monetary claim is being made, questions could arise about how much interest has accrued. The Rent Disputes Tribunal is not responsible for any mistakes made when making calculations. You will also find some statistics relating to average rent levels.
The Consumer Price Index calculator
Statistics Norway's Rental Market Survey - average monthly and annual rent per square metre, according to price zone and number of rooms in NOK
(for Oslo/Bærum, Akershus, Bergen, Trondheim, the whole country, urban areas, etc.)
Statistics Norway's (SSB's) Rental Market Survey (LMU) - general