Are you over weight by being 155cm tall and weighing 45kg you are quite athletic?

For a woman who weighs 45 kilograms and is 155 centimeters tall she would be considered underweight. 155 centimeters is equal to about 5 feet tall and 45 kilograms is equal to about 99.2 pounds. A 5 foot woman should weigh 104-115 pounds.