🫁 Health & Body

Lung Age Calculator

Estimate your lung age using the Morris & Temple equation if you have a spirometry FEV1 value, or use the lifestyle proxy if you don't. Lung age shows whether your lung function matches younger or older population averages.

Educational estimate only. A true lung age requires a spirometry test performed by a healthcare professional. If you have respiratory symptoms, breathlessness, or are a current/former smoker, please consult a doctor and ask about spirometry testing.
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Estimated Lung Age
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FEV1 (litres, predicted)
—vs Calendar Age
—Method Used

How lung age is calculated

Lung age was introduced by Morris and Temple (1985) as a way to make spirometry results meaningful to patients. The concept: your FEV1 (the volume of air you can forcibly exhale in one second) is compared to population reference values. If your FEV1 matches the predicted value for a 55-year-old but you're 40, your lung age is approximately 55.

Morris & Temple Lung Age Equations

♂
Men: Lung Age = [0.043 × height_cm − FEV1 − 2.010] / 0.028
♀
Women: Lung Age = [0.029 × height_cm − FEV1 − 1.350] / 0.021
!
A clinical spirometry test with a trained technician is necessary for reliable FEV1 measurement. Self-reported values and proxy scores are approximations only.

Sources

  1. Morris JF, Temple W. "Spirometric 'lung age' estimation for motivating smoking cessation." Preventive Medicine. 1985;14(5):655–662.
  2. Parkes G, et al. "Effect on smoking quit rate of telling patients their lung age." BMJ. 2008;336(7644):598–600.