Free Stuttering Calculator
Read Harbor Morning aloud and unlock your estimated %SS baseline — a practice self-check, not a diagnosis.
One sample is a snapshot. StutterLab is speech training software — not a substitute for care from a licensed SLP.
Standardized free baseline · 128 syllables · ~1 min
One clean read — no practice. We hide the passage until your mic is on and the countdown finishes, so everyone gets a fair baseline. Allow microphone access when prompted.
Passage locked
Tap Start when you're ready. The text appears after a short countdown — read it once at your natural pace.
Common questions
What does this stuttering calculator measure?
It estimates % syllables stuttered (%SS) from one standardized StutterLab passage — Harbor Morning — with a breakdown of repetitions, prolongations, blocks, and interjections. Use it as a personal baseline, not a clinical diagnosis.
Do I need an account?
No. Enter your first name and email while we analyze to unlock the full baseline report.
Why is everyone reading the same passage?
We standardize on Harbor Morning so baselines are comparable across people and over time.
Is this speech therapy or a diagnosis?
No. This is a practice-support self-check for adults 18+. It does not diagnose, treat, cure, or replace care from a licensed SLP.
How accurate is a free %SS check?
Transcript-based estimates can miss blocks, tension, and avoidance. An SLP assessment is still the gold standard when speech concerns affect daily life.