French ↔ Millimeter Conversion Calculator

Converts between French catheter size and millimeters.

Inputs

Color mode links each input to the matching equation term and solving arithmetic.

Equation and Work

Equation:
Solving steps:
Converted value
—
converted result
Conversion factor
—
reference
Direction
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selected

Clinical Significance

Converts between French catheter size and millimeters.

This calculator expands that idea by identifying the relevant measured values, substituting the selected inputs, and carrying the arithmetic through in the solving steps.

Use this quick conversion when translating catheter French size to approximate outside diameter in millimeters.

This is a unit conversion and does not select a suction catheter size for a patient or airway.

References (APA 7th Edition)

  1. Chang, D. W. (2020). Respiratory Care Calculations (Revised 4th ed.). Jones & Bartlett Learning. Formula content adapted from the uploaded text/reference packet.