Alveolar Ventilation Calculator (VA)

Alveolar Ventilation Calculator (VA) | Online Free Tool | Elysia Tools

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

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

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

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Continue with connected tools and hubs

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

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Normal resting alveolar ventilation

2. Estimate dead space from body weight

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