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Children's Asthma Peak Flow Calculator

Some people use peak flow meters to monitor changes in asthma. Peak flow readings show how well a child's lungs are working. This calculator shows the predicted peak flow in children. With your child's height, you can find his or her predicted peak flow. Predicted peak flow is how much air a child of a certain height is expected to breathe out (exhale) after taking a deep breath.

An even more important number is your child's personal best peak flow. This number helps monitor your child's asthma. Changes from your child's personal best help you see how well your child's asthma is controlled. These changes also can let you know when your child needs medicine and when your child needs medical care.

If you don't know how to find it, click here for an explanation.

Note: The minimum height for this calculator is 44 inches.

Enter Your Child's Information

What is your child's height?

This calculator is not intended to replace the evaluation of a health care professional.

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