Kotlow Ankyloglossia Class
Kotlow classification of ankyloglossia, Class I to IV, from the free tongue length in mm.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Free tongue length
- 9 mm
Result: Kotlow Class II (moderate ankyloglossia): free tongue length 9 mm, in the 8 to 11 mm range.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Free tongue length
How this is calculated
Citation
Kotlow LA. Ankyloglossia (tongue-tie): a diagnostic and treatment quandary. Quintessence Int. 1999;30(4):259-262. Read the sources: Kotlow 1999 ↗, Cureus 2026 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.