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Instantly Convert French (F) to Millimeters (mm) and Many More Length Conversions Online. French Conversion Charts. Many Other Conversions.
The French units roughly correspond to the outer circumference of the catheter (see table below). For example, if the French size is 9, the diameter is 9/3 = 3.0; mm. It is seen that the French unit is fully redundant with the metric system but introduces potential for rounding errors.
Instantly Convert Millimeters (mm) to French (F) and Many More Length Conversions Online. Millimeters Conversion Charts. Many Other Conversions.
Gauge - French Conversion. Enter a value in a cell and click the Calculate button in the same row to determine approximate equivalence in the other unit. By convention, needles or single lumen catheters are sized by gauge and multi-lumen catheters are measured by French size.
1 Fr is equivalent to 0.33 mm = .013" = 1/77" of diameter. Thus the size in French units is roughly equal to the circumference of the catheter in millimeters.
The French size of a catheter is determined by a simple multiplication of 3 (diameters in millimeters multiplied by 3 = the French size). For example, if a catheter has a diameter of 4.7 millimeters, then the French (Fr) size is 14.
By convention, peripheral IV catheters are sized in gauge, and central venous catheters (CVCs) are sized in French. This table compares French sizing to gauges for catheters with flow rates.
Conversion between 'French' and millimeters. 'French' is a measurement primarily of circumference rather than just 'size'. As far as airway equipment is concerned, the 'French' measurement is only rarely applied, for example to the Bronchocath double-lumen endobronchial tube or ET tube stylets.
French use meters, decimeters, centimeters and millimeters to calculate lengths. The following table makes it easy to convert between the length units. Unit conversion table for lengths
3 French (FR) = 1 mm. 1 in = 25.4 mm. 1 FR = 1 / (25.4 * 3) in. Then mix and match :) More info on French sizing and applications can be found on Wikipedia: French catheter scale.