Asthma Zone Calculator - Are You Having An Asthma Attack?

This calculator is for people who have asthma and it uses your peak flow number. To find your "personal best" peak flow number, take your peak flow each day for 2 to 3 weeks. Your asthma should be under good control during this time. Take your peak flow as close to the times of day below as you can. These times for taking your peak flow are only for finding your personal best peak flow:

• Between noon and 2 p.m. each day
  
• Each time after you take your quick-relief medicine to relieve symptoms
  
• Any other time your doctor tells you to

Write down the number you get for each peak flow reading. The highest peak flow number you had during the 2 to 3 weeks is your personal best. This asthma calculator will determine your Green, Yellow and Red Zones, based on your personal best peak flow number.