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Estimate expected adult vital capacity with the Baldwin equations ((27.63 − 0.112×age)×height for males, (21.78 − 0.101×age)×height for females) and optionally grade a measured VC as % predicted. Not medical advice.
Execution
Fill in the form, run the tool, and review the result in one place.
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Tool usage guide
The Vital Capacity Estimator calculates expected adult vital capacity (VC) in milliliters and liters using the classic Baldwin regression equations based on sex, age, and standing height. By entering an optional measured spirometry value, it also determines the percent predicted vital capacity and assigns a standard respiratory severity band.
Background
A student wants to determine baseline reference lung volumes for a 25-year-old male participant measuring 180 cm.
Problem
Calculate the predicted vital capacity in both mL and L using established physiology formulas.
How to use
Set sex to Male, enter 180 for height, and enter 25 for age.
Outcome
Returns a predicted vital capacity of 4469.4 mL (4.5 L).
Background
An instructor is demonstrating spirometry result interpretation for a 40-year-old female patient measuring 160 cm who blew 2.0 L on a spirometer.
Problem
Determine the predicted baseline and classify the reduction severity based on percent predicted.
How to use
Set sex to Female, height to 160 cm, age to 40 years, measured VC to 2.0, and unit to L.
Outcome
Calculates a predicted VC of 2838.4 mL (2.8 L), a percent predicted of 70.5%, and classifies it as Mildly reduced (70–79%).
It uses the Baldwin equations: (27.63 − 0.112 × age) × height (cm) for males and (21.78 − 0.101 × age) × height (cm) for females.
Values ≥80% are normal, 70–79% indicate mild reduction, 60–69% moderate, 50–59% moderately severe, 35–49% severe, and <35% very severe.
Yes, you can select either Liters (L) or Milliliters (mL) from the unit dropdown.
The model is designed for adults aged 15 to 100 years with standing heights between 100 and 250 cm.
No, this tool provides population-level reference estimates for educational and informational purposes and is not medical advice.