To calculate the square meterage of your banner take the height of your banner in meters multiplied by the width of your banner in meters. For example, if your banner is 800mm wide by 2000mm high you would calculate: .8 x 2 = 1.6 sq m total. For square meterage using mm, multiply your height by width in millimetres & divide by 1,000,000. (1000 x 3000) /1,000,000 = 3.0 square metres total. Just a reminder: the four models of BannerSaver and their sizes are: BannerSaver Standard Brackets – up to 1.6 square metres BannerSaver Large Brackets – up to 2.1 square metres BannerSaver Extra-Large Brackets – up to 2.8 square metres