Lung size depends mainly on height, sex and age. Measured values are compared with these predictions as a percentage; below about 80% of predicted is generally abnormal. Newer GLI equations account for ethnicity and use lower limits of normal.
How to use the Lung Capacity Calculator
- Sex
- Age
- Height
- Measured FVC (optional)
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter sex, age and height; add a measured FVC to see the percentage of predicted.
Inputs explained
| Field | What to enter |
|---|---|
| Sex | Choose one: Male, Female |
| Age | In years |
| Height | Units: cm, in, m, ft, mm |
| Measured FVC (optional) | In L |
Example values
How the main result changes when Age changes and everything else stays at the example values above:
| Age (years) | Total lung capacity (L) |
|---|---|
| 20 | 6.9 |
| 30 | 6.9 |
| 40 | 6.9 |
| 50 | 6.9 |
| 60 | 6.9 |
| 80 | 6.9 |
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
Men: TLC = 7.99H − 7.08; VC = 6.10H − 0.028A − 4.65; FVC = 5.76H − 0.026A − 4.34; FEV1 = 4.30H − 0.029A − 2.49; RV = 1.31H + 0.022A − 1.23; FRC = 2.34H + 0.009A − 1.09
Women: TLC = 6.60H − 5.79; VC = 4.66H − 0.026A − 3.28; FVC = 4.43H − 0.026A − 2.89; FEV1 = 3.95H − 0.025A − 2.60; RV = 1.81H + 0.016A − 2.00; FRC = 2.24H + 0.001A − 1.00 (H in m, A in years, litres)
Worked example
Inputs — Sex: Male; Age: 40 years; Height: 175 cm; Measured FVC (optional): 0 L.
Results — Total lung capacity = 6.9 L; Vital capacity = 4.9 L; Forced vital capacity = 4.7 L; FEV1 = 3.88 L; Residual volume = 1.94 L; Functional residual capacity = 3.37 L; Your FVC as % of predicted = 100 %.
Key terms
- TLC
- Total lung capacity.
- RV
- Residual volume.
- FRC
- Functional residual capacity.
Frequently asked questions
What is a normal lung capacity?
About 6 litres total lung capacity in an average adult man and 4.2 litres in a woman.
Can lung capacity be increased?
Exercise improves breathing efficiency but does not change lung size much.
Why do lung volumes fall with age?
The chest wall stiffens and lung elasticity declines.