Charrière to millimeters
Type a value in Ch to get it in mm instantly.
4.667mm
That's 1.75× as wide as an 8 Fr feeding tube, while a 16 Fr urinary catheter is 1.14× wider. Its circumference is about 14.66 mm.
Convert the other way: mm to Ch
What it means
How wide is that tube?
French gives the outer diameter. The inner lumen is smaller and depends on the wall thickness and material.
The math
How to convert Ch to mm
To convert Charrière to millimeters, multiply by 0.333333.
Example: 14 Ch × 0.333333 = 4.66667 mm.
In the other direction, 1 mm = 3 Ch.
Every unit
That tube size in every unit
Tables
Ch to mm conversion table
| Ch | mm |
|---|---|
| 3 Ch | 1 mm |
| 4 Ch | 1.33333 mm |
| 5 Ch | 1.66667 mm |
| 6 Ch | 2 mm |
| 7 Ch | 2.33333 mm |
| 8 Ch | 2.66667 mm |
| 10 Ch | 3.33333 mm |
| 12 Ch | 4 mm |
| 14 Ch | 4.66667 mm |
| 16 Ch | 5.33333 mm |
| 18 Ch | 6 mm |
| 20 Ch | 6.66667 mm |
| 22 Ch | 7.33333 mm |
| 24 Ch | 8 mm |
| 28 Ch | 9.33333 mm |
| 30 Ch | 10 mm |
mm to Ch conversion table
| mm | Ch |
|---|---|
| 3 mm | 9 Ch |
| 4 mm | 12 Ch |
| 5 mm | 15 Ch |
| 6 mm | 18 Ch |
| 7 mm | 21 Ch |
| 8 mm | 24 Ch |
| 10 mm | 30 Ch |
| 12 mm | 36 Ch |
| 14 mm | 42 Ch |
| 16 mm | 48 Ch |
| 18 mm | 54 Ch |
| 20 mm | 60 Ch |
| 22 mm | 66 Ch |
| 24 mm | 72 Ch |
| 28 mm | 84 Ch |
| 30 mm | 90 Ch |
Quick answers
Quick answers
- How many mm is 1 Ch?
- 1 Ch is 0.333333 mm.
- How many mm is 10 Ch?
- 10 Ch is 3.33333 mm.
- How many mm is 14 Ch?
- 14 Ch is 4.66667 mm.
The units
About these units
Charrière (Ch)
The same scale under its inventor’s name, used across Europe.
Millimeters (mm)
Outer diameter in millimeters.
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