Last updated October 10, 2026 · Report an error
Combines the four standard spirometry sub-volumes (Tidal Volume, Inspiratory Reserve Volume, Expiratory Reserve Volume, Residual Volume) into the standard published lung capacities, using the standard volume-addition relationships taught in respiratory physiology: VC = TV+IRV+ERV, IC = TV+IRV, FRC = ERV+RV, TLC = VC+RV. Pure arithmetic combining given values. For general reference and educational purposes only — not a medical diagnosis. Consult a doctor for actual interpretation of pulmonary function test results.
How it works
Enter Tidal Volume, Inspiratory Reserve Volume, Expiratory Reserve Volume, and Residual Volume in mL. The tool applies the four standard capacity formulas.
- Enter tidal Volume (mL).
- Enter inspiratory Reserve Volume (mL).
- Enter expiratory Reserve Volume (mL).
- Enter residual Volume (mL).
- Click Calculate to see your results.
Examples
TV 500, IRV 3000, ERV 1100, RV 1200
VC = 500+3000+1100 = 4600 mL. IC = 500+3000 = 3500 mL. FRC = 1100+1200 = 2300 mL. TLC = 4600+1200 = 5800 mL — close to a commonly cited average adult TLC of roughly 6000 mL.
Who should use it
- Reviewing a full pulmonary function test.
- Respiratory physiology education.
Industry applications
- Pulmonology reference
- Clinical/physiology education
Advantages
- Computes all four standard capacities in one tool.
- Shows the standard formula for each.
Limitations
- Normal values vary substantially by body size, sex, and age.
- Does not replace clinical interpretation.
Common mistakes to avoid
- Mixing up Residual Volume (not measurable by spirometry alone) with Expiratory Reserve Volume.
Best practices
- Use values from the same pulmonary function test session for consistency.
Tips
- Vital Capacity (VC = TV+IRV+ERV) is itself one of the four outputs here — there is no need for a separate standalone Vital Capacity tool when all four volumes are already known.