Average Weight of a Woman Research shows that the average weight of women in the UK is 10 stone 3.5lbs. The average weight in 1951 was 9 stone 10lbs. In America, the average weight for women is 11 stone 1.5lbs. Other interesting facts...Do head lice prefer clean hair?Human Bones FactsWhy do people from Scotland have Ginger Hair?What causes bad breath?What causes Asthma?