Phonation Time (TMF) Calculator

Clinical stopwatch with 3-5 attempts and profile-based classification (Behlau).

Created by: Renato Passos, Eng. de Software
Reviewed by: Renato Passos, Eng. de Software

Last updated: Apr 18, 2026

Clinical disclaimer for professionals and patients. The protocols used (Behlau, Hirano, ASHA, IALP and peer-reviewed equivalents) are references from scientific literature adapted to digital format. See full disclaimer

About this tool

Tempo Máximo de Fonação (TMF): indicador clássico de eficiência glótica. Cronômetro integrado com registro de até 5 tentativas e classificação automática conforme valores normativos por perfil etário/sexo (Behlau, Kent & Read).

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Clinical disclaimer for professionals and patients

The protocols used (Behlau, Hirano, ASHA, IALP and peer-reviewed equivalents) are references from scientific literature adapted to digital format. This tool is a screening aid, not a replacement for in-person speech-language assessment. A licensed speech-language pathologist (ASHA-certified in the US, HCPC-registered in the UK, or equivalent EU professional order) must complement it with qualitative analysis and patient history. All voice and clinical data is processed only on your device.

See all platform disclaimers