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Ventilator Tidal Volume Calculator

Work out ventilator tidal volume instantly with clear inputs, formula shown and shareable results.

About Ventilator Tidal Volume Calculator

Calculates predicted body weight from height and sex using the Devine formula, then applies a lung-protective millilitres-per-kilogram target.

Formula

Devine predicted body weight

Male PBW = 50 + 2.3 x (height in inches - 60); female PBW = 45.5 + 2.3 x (height in inches - 60); tidal volume = PBW x target mL/kg

Worked example

With the default values below, Ventilator Tidal Volume Calculator returns Target tidal volume of 423. Change any input above and every figure here is recalculated in your browser.

Inputs used

Heightaccepts 100–220 cm
175 cm
Sexone of Male, Female
Male
Target tidal volumeaccepts 4–10 mL/kg PBW
6 mL/kg PBW

Results

Target tidal volume
423 mL
Predicted body weight
70.5 kg
Upper limit at 8 mL/kg
564 mL

Step by step

  1. 1Values used
  2. 2Devine predicted body weight
  3. 3Target tidal volume= 423 mL
  4. 4Predicted body weight= 70.5 kg
  5. 5Upper limit at 8 mL/kg= 564 mL

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Why predicted rather than actual weight?

Lung size tracks height, not body fat, so actual weight would over-inflate the lungs of heavier patients.

What target is standard?

ARDSNet lung-protective ventilation uses 6 mL/kg predicted body weight, with 4 to 8 mL/kg as the working range.

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