Hi May, On UK to UK deliveries weights and dimensions are not critical provided your parcel is no longer than 1.2m and no heavier than 20kg. Some services have lower weight restrictions so please check the service description before placing your order. Some tips on finding out weights and dimensions may include: a)Weigh yourself on the bathroom scales with and without the parcel then calculate the difference b) Check out a similar item on ebay (weights and dimensions are often given on the description) We strongly recommend, that when entering weights and dimensions, that they are as accurate as possible. This is to ensure that you avoid further charges and any possible delivery delays. Jo