Phonotactic Probability Calculator

Phonotactic probability refers to the frequency with which a phonological segment, such as /s/, and a sequence of phonological segments, such as /s^/, occur in a given position in a word (Jusczyk, Luce & Charles-Luce, 1994). The method used to estimate phonotactic probability in Jusczyk, Luce, and Charles-Luce (1994) and in many other studies investigating the influence of phonotactic probability on language processing (see below) has been made freely available to language researchers on this web site. The effort to make this method of calculating phonotactic probability available to the research community was supported in part by research grants R03 DC 04259 (Kansas University), and R01 DC 0265801 (University at Buffalo) from the National Institute on Deafness and Other Communication Disorders, National Institutes of Health.

A detailed description of how to use the Phonotactic Probability Calculator (PPC), how to interpret the output, and a list of the computer readable transcription (and the IPA equivalents) required as input to the PPC can be found in the paper below. If you use the PPC to estimate phonotactic probability in a set of real English words or made-up nonwords, please be sure to cite this article:

Vitevitch, M.S. & Luce, P.A. (2004) A web-based interface to calculate phonotactic probability for words and nonwords in English. Behavior Research Methods, Instruments, and Computers, 36, 481-487. [PDF version]

Computer-Readable transcription ("Klattese") equivalents to IPA

Furthermore, I would greatly appreciate receiving a reprint (electronic or hard copy) of any published work that uses the Phonotactic Probability Calculator. Reprints may be sent to:

Michael Vitevitch
Department of Psychology
1415 Jayhawk Blvd.
University of Kansas
Lawrence, KS 66045

OR via e-mail:

The command to
automatically redirect the name of the server to the proper IP address is no longer functioning. In order to properly "redirect" to the server you must add an entry to the hosts file on any computer you wish to use to access the PPC.


Simply add this line to your hosts file: # phonotactic calculator

Connect to the 
Phonotactic Probability Calculator

BNCD Center
 University of Kansas
 1000 Sunnyside Avenue
 3031 Dole Human Development Center
 Lawrence, Kansas 66045

 funded by the National Institute on Deafness and Other Communication Disorders,
 National Institutes of Health
 grant P30 DC005803

2004 The BNCD Center at the University of Kansas. The BNCD is affiliated with the Schiefelbusch Institute for Life Span Studies.