Free tool · for SLP students and clinicians

PCC calculator

Enter the number of consonants attempted and how many were correct. You get PCC, PCC-R if you separate distortions, the Shriberg and Kwiatkowski severity band, and the average PCC for the child's age from a 2018 review of 15 studies.

Consonants attempted

Consonants correct

Of the errors, distortions (optional, for PCC-R)

Age in months (optional)

Average PCC by age

Means across studies and languages, McLeod & Crowe (2018), Table 2.

Age	Mean PCC
1;6	57%
2;0	64%
2;6	75%
3;0	86%
3;6	89%
4;0	92%
4;6	93%
5;0	94%
5;6	95%

This tool is general information for families and students. It is not a screening or diagnostic tool, does not give individual advice, and is not a substitute for an assessment by a registered speech-language pathologist. If you are worried about your child's communication, Ontario families can self-refer to their local Preschool Speech and Language Program at no cost.

Sources: Shriberg & Kwiatkowski (1982), Phonological disorders III: a procedure for assessing severity of involvement, JSHD; McLeod & Crowe (2018), Children's consonant acquisition in 27 languages, AJSLP (Table 2)

Frequently asked questions

What counts as a consonant error?

Shriberg and Kwiatkowski count omissions, substitutions, distortions and additions as errors. Dialectal variants and casual-speech forms are not errors. Only intelligible words are scored, and repeated words are scored once.

What are the severity bands?

From Shriberg and Kwiatkowski (1982): above 85 percent is mild, 65 to 85 is mild to moderate, 50 to 65 is moderate to severe, and below 50 is severe. The bands were developed for children aged 4 to 8 and are a guide, not a diagnosis.

What is PCC-R?

PCC-Revised scores distortions as correct, so it reflects only omissions and substitutions. It is often used for older children where distortions are the remaining errors.

Go further

MLU calculator Speech sound checker Speech sound development chart

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