Experts are increasingly urging people to know their BMI, a figure that takes into account not just weight but also height to indicate body fat.

This calculator is for children with asthma. If you know your child's height, you can find his or her predicted peak flow.

BMI, or body mass index, uses weight and height to calculate weight status for adults. BMI for children and teens also takes into account gender and age because healthy body fatness differs between boys and girls and changes as they grow. This BMI calculator will help you determine if your child is at a healthy weight.

It is important to know your estimated due date in order to help plan for the baby's birth.

When you are trying to have a baby, fertile times are an important factor. Use this information about your cycles to help to predict your more fertile times and when you will ovulate.

Your target heart rate is the range at which sustained physical activity - running, cycling, swimming laps, or any other aerobic exercise - is considered safe and effective.