http://www.royalmail.com/easyweigh/
*When writing or sending cards to friends and family around the world are you sometimes unsure about how much it will cost to send your letter? If so, you'll welcome our handy little weighing device called EasyWeighTM.
EasyWeigh allows you to determine the weight for lightweight international letters from the comfort of your own home, it can also be used on inland letters too! EasyWeigh is a cardboard weighing device that determines whether your letters fall into the 20g, 40g, 60g or 100g weight bracket. Once you know the weight you can check the postage, which means you can easily avoid the unnecessary expense of overpaying, and also avoid annoying delays or inconvenient surcharges due to paying insufficient postage.
So there's no more need to guess it when you can check it with EasyWeigh.
EasyWeigh is free and comes complete with a handy mini wallet price guide, so all you need to do is complete this form and we'll send you your very own EasyWeigh* with our compliments.