🫁Breathing Rate & Ventilation Calculator
Normal: 12-20
Normal: 400-600 mL
Respiratory rate (RR) is breaths per minute; tidal volume (TV) is volume per breath. Minute ventilation = RR × TV. Normal resting: 12–20 breaths/min, 400–600ml tidal volume. Increased RR is one of the earliest signs of physiological deterioration.
- 1Minute ventilation (MV) = RR × Tidal volume
- 2Alveolar ventilation = (TV − dead space) × RR
- 3Anatomical dead space ≈ 1ml per lb body weight (~150ml for average adult)
- 4Dead space does not participate in gas exchange
RR=15 breaths/min · TV=500mL=MV = 7.5 L/min · Alveolar ventilation ≈ 5.25 L/min(500-150)×15=5,250ml alveolar ventilation
| Parameter | Normal range |
|---|---|
| Respiratory rate | 12–20 breaths/min (adult) |
| Tidal volume | 400–600 mL |
| Minute ventilation | 5–8 L/min (rest) |
| Dead space | ~150 mL (anatomical) |
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Fun Fact
The diaphragm contracts about 20,000 times per day — more than any other skeletal muscle. It is so central to life that diaphragm pacemakers (similar to cardiac pacemakers) are used for patients with high spinal cord injuries.
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