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Ventilator Tidal Volume by PBW (ARDSNet)

· 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.

Compute lung-protective VT from ARDSNet predicted body weight (PBW). Male 50+0.91×(cm−152.4); female 45.5+0.91×(cm−152.4). VT = mL/kg×PBW (4–8, default 6). Reports full range and plateau-pressure target. Derived from ARDSNet NEJM 2000, Brower 2004, StatPearls, LITFL. Not medical advice.

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Tool usage guide

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Key facts

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

Overview

The Ventilator Tidal Volume by PBW (ARDSNet) calculator estimates predicted body weight (PBW) from height and sex, then calculates a tidal volume using 4–8 mL/kg PBW, with 6 mL/kg as the default. It reports the selected volume, the 4–8 mL/kg range, and the plateau-pressure target. This tool is not medical advice.

When to use

  • Estimate an ARDSNet-based tidal volume from a patient's height and sex.
  • Compare standard 6 mL/kg ventilation with lower or higher values from the 4–8 mL/kg range.
  • Review the calculated PBW and tidal-volume range before checking settings with the responsible clinical team.

How it works

  1. 1Enter the patient's height in centimeters and select male or female.
  2. 2The calculator derives PBW using the corresponding ARDSNet formula.
  3. 3Choose a tidal-volume setting from 4 to 8 mL/kg PBW, or keep the default of 6 mL/kg.
  4. 4The result reports PBW, the selected tidal volume, the full 4–8 mL/kg range, and the applicable category.

Use cases

  • Estimate an initial lung-protective tidal volume for mechanical ventilation calculations.
  • Evaluate lower 4 mL/kg settings in severe ARDS scenarios involving permissive hypercapnia.
  • Document PBW-based tidal-volume calculations for education, review, or clinical discussion.

Examples

1. Standard 6 mL/kg calculation for a 175 cm male

Critical care clinician

Background

A clinician wants an ARDSNet-based tidal-volume estimate using a patient's height rather than actual body weight.

Problem

Calculate PBW and the standard lung-protective tidal volume, while also reviewing the lower and upper range.

How to use

Enter height 175 cm, select Male, keep Tidal Volume per kg PBW at 6, and set Decimal Places to 0.

{"height":175,"sex":"male","vtPerKg":6,"decimalPlaces":0}

Outcome

The calculator reports PBW of 70.6 kg, a tidal volume of about 423 mL, and a 4–8 mL/kg range of 282–565 mL.

2. Lower 4 mL/kg calculation for a 160 cm female

Respiratory therapy educator

Background

An educator is demonstrating how a lower PBW-based setting changes the calculated tidal volume for a shorter patient.

Problem

Show the result for 4 mL/kg PBW and compare it with the full ARDSNet range.

How to use

Enter height 160 cm, select Female, choose 4 mL/kg PBW, and set Decimal Places to 0.

FAQ

What inputs does the calculator require?

It requires height in centimeters and sex. Tidal volume per kg PBW and decimal places are optional.

What is the default tidal volume setting?

The default is 6 mL/kg PBW, described as the standard lung-protective setting.

What tidal-volume range can I enter?

The calculator accepts values from 4 to 8 mL/kg PBW in 0.5 mL/kg steps.

How is predicted body weight calculated?

For males, PBW is 50 + 0.91 × (height in cm − 152.4). For females, it is 45.5 + 0.91 × (height in cm − 152.4).

Does this calculator replace clinical judgment?

No. It provides a calculation based on the stated ARDSNet formulas and is not medical advice.

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{"height":160,"sex":"female","vtPerKg":4,"decimalPlaces":0}

Outcome

The calculator reports PBW of 52.4 kg, a tidal volume of about 210 mL, and a 4–8 mL/kg range of 210–419 mL.