In order to determine the postal rate for sending a letter or package, you will have to know the weight of the item being sent. These weights can be calculated using ISO Standard Paper Sizes. Weight is calculated using grams per square meter (g/m²).

For example: the A4 format has an area of 1/16m² and weighs 5g per page using standard quality paper. With a full sample, items can also be weighed manually on a scale. Shanahan Direct are happy to establish the weight and postage rate for your items.