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Alveolar Ventilation Calculator (VA)

· Last updated：2026-08-11

This tool is for informational purposes only and does not constitute medical, financial, or legal advice; consult a qualified professional for advice.

Calculate VA = (VT − VD) × RR in L/min. VD may be supplied or estimated as ~2 mL/kg body weight. Normal resting ~4–6 L/min; low → hypercapnia, high → hypocapnia. Derived from West, LITFL, StatPearls, and Radford 1955. Not medical advice.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Health
Input types
number
Output type
json
Sample coverage
4
API ready
Yes

Overview

The Alveolar Ventilation Calculator estimates alveolar ventilation (VA) in L/min using VA = (VT − VD) × RR. Enter tidal volume and respiratory rate, then provide dead space or estimate it from body weight at approximately 2 mL/kg.

When to use

  • Estimate effective alveolar ventilation from tidal volume, dead space, and respiratory rate.
  • Check how changes in respiratory rate or tidal volume affect ventilation beyond dead space.
  • Review whether a calculated resting value is approximately within the 4–6 L/min reference range.

How it works

  1. 1Enter tidal volume (VT) in mL and respiratory rate (RR) in breaths per minute.
  2. 2Enter dead space (VD) in mL, or provide body weight so VD can be estimated at approximately 2 mL/kg.
  3. 3The calculator applies VA = (VT − VD) × RR and converts the result from mL/min to L/min.
  4. 4The result includes effective tidal volume, the dead-space source, and a ventilation category.

Use cases

  • Respiratory physiology study and teaching using tidal volume, dead space, and respiratory rate.
  • Clinical education and critical-care review of effective, rather than total, ventilation.
  • Comparing measured dead-space values with an approximate weight-based estimate.

Examples

1. Normal resting alveolar ventilation

Medical student

Background

A student is reviewing a resting adult example with a tidal volume of 500 mL, respiratory rate of 12 breaths/min, and dead space of 150 mL.

Problem

Calculate the effective alveolar ventilation and compare it with the approximate resting reference range.

How to use

Enter VT as 500, RR as 12, VD as 150, and choose 1 decimal place.

VT: 500 mL; RR: 12 breaths/min; VD: 150 mL; decimal places: 1

Outcome

The calculator returns 4.2 L/min, categorized as normal alveolar ventilation. Effective tidal volume is 350 mL.

2. Estimate dead space from body weight

Respiratory therapy learner

Background

A 70 kg adult has a tidal volume of 450 mL and respiratory rate of 20 breaths/min, but no dead-space value is supplied.

Problem

Estimate dead space and calculate alveolar ventilation without entering VD directly.

How to use

Enter VT as 450, RR as 20, body weight as 70 kg, and choose 1 decimal place. Leave VD blank.

FAQ

What formula does the calculator use?

It uses VA = (VT − VD) × RR, where VA is alveolar ventilation, VT is tidal volume, VD is dead space, and RR is respiratory rate.

Which inputs are required?

Tidal volume in mL and respiratory rate in breaths per minute are required.

Can dead space be estimated?

Yes. If VD is omitted, the calculator estimates it at approximately 2 mL/kg using the entered body weight.

What is the normal resting range?

The reference range for normal adult resting alveolar ventilation is approximately 4–6 L/min.

Is this calculator medical advice?

No. It is an educational calculation and should not replace clinical assessment or medical advice.

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VT: 450 mL; RR: 20 breaths/min; body weight: 70 kg; decimal places: 1

Outcome

Dead space is estimated as 140 mL, producing an alveolar ventilation of 6.2 L/min and a high alveolar ventilation category.