Swiss catastrophe data company Perils has upgraded its final loss estimate for Cyclone Debbie to $1.74 billion.

Its previous estimate for total losses was $1.66 billion, issued six months ago.

Debbie hit Queensland and NSW from March 28 into early April last year.

Perils says this is the first time a market-loss footprint for an Australian catastrophe has been made available at a postcode level, and by property line of business.

The data is divided into cyclone and flood losses, allowing insurers to derive damage-degree functions as a percentage of total sums insured in both categories.