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Vital Capacity Assessment

Enter demographic data and measured VC to obtain predicted values, percent predicted, and interpretation for pulmonary function analysis.

Results

Predicted VC

4.51 L

Kory reference equation

Percent predicted

84%

Vital capacity within normal limits.

Interpretation tips:

  • VC <80% supports restrictive or mixed pattern (confirm with TLC and DLCO).
  • Normal VC with low FEV1/FVC suggests obstruction with air trapping.

How to Use This Calculator

Vital capacity should be measured as slow VC (SVC) or forced VC (FVC) with acceptable technique per ATS criteria. This calculator uses Kory equations; compare with lab-specific predicted values when available. Evaluate VC alongside FEV1, TLC, and DLCO to differentiate restrictive vs obstructive disease.

Formula

Male predicted VC (L) = 0.052 * height(cm) - 0.022 * age - 3.60.

Frequently Asked Questions

Use slow VC when available; if only FVC exists, note potential underestimation due to air trapping. Reference equations vary. Use lab-specific or GLI equations when available to account for ethnic differences. Rare for standard adult heights; check units. Values <0 may indicate out-of-range formula - use lab references. Yes - trained individuals may have elevated VC; interpret within clinical context. Repeat when symptoms change or at intervals for ILD/COPD monitoring (e.g., every 3-12 months).