Body Mass Index
The healthy weight range is based on a measurement known as the Body Mass Index (BMI). This can be determined if you know your weight and your height.
To calculate your BMI you can select your height and weight and let the BBC BMI calculator do the rest.
BBC Health - Tips and ideas to maintain a healthy weight.
BBC Health A variety of topics including getting motivated, over 50's, pregnancy fitness.
Exercise counter - NHS Direct Interactive Tool