Alveolar Ventilation Calculator
Estimate alveolar ventilation after subtracting dead-space volume.
Alveolar Ventilation measurements
Enter your values, then calculate.
Result
How to calculate alveolar ventilation
Alveolar ventilation is the volume of air per minute that actually participates in gas exchange, excluding the portion that stays in the dead space (airways that don't exchange gas) — a more physiologically meaningful measure than total minute ventilation.
How the calculation works
Alveolar ventilation = (Tidal volume − Dead-space volume) × Respiratory rate, converted from mL to liters by dividing by 1000.
Example
A tidal volume of 500 mL, dead space of 150 mL, and respiratory rate of 14 breaths/min: Alveolar ventilation = (500−150) × 14 ÷ 1000 = 350 × 14 ÷ 1000 = 4.9 L/min.
Frequently asked questions
How is Result calculated?
Result = ([Tidal volume] − [Dead-space volume]) × [Respiratory rate] ÷ 1000.
Is the Alveolar Ventilation Calculator free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Alveolar Ventilation Calculator
Alveolar ventilation = (Tidal volume − Dead-space volume) × Respiratory rate, converted from mL to liters by dividing by 1000.
Let's understand your alveolar ventilation result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Alveolar Ventilation
- Dead space is typically estimated at roughly 1 mL per pound of ideal body weight (or about 150 mL for an average adult) unless measured directly.
- Rapid, shallow breathing can maintain the same total minute ventilation as slow, deep breathing but achieve much lower alveolar ventilation, since dead space is a fixed cost per breath.
Common Alveolar Ventilation Mistakes to Avoid
- Using total minute ventilation (tidal volume × rate) instead of alveolar ventilation when evaluating actual gas exchange, since these can differ substantially, especially with rapid shallow breathing.
When to Use This Calculator
Alveolar ventilation is the volume of air per minute that actually participates in gas exchange, excluding the portion that stays in the dead space (airways that don't exchange gas) — a more physiologically meaningful measure than total minute ventilation.