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FFTPACK is a package of Fortran subroutines for the fast Fourier transform. It includes complex, real, sine, cosine, and quarter-wave transforms. It was developed by Paul Swarztrauber of the National Center for Atmospheric Research, and is included in the general-purpose mathematical library SLATEC.

Developer(s)Paul N. Swarztrauber
Initial releaseApril 1985
Written inFortran
TypeNumerical software
Licensepublic domain

Much of the package is also available in C and Java translations.


  • P.N. Swarztrauber (1982). Vectorizing the FFTs. pp. 51–83 in: Parallel Computations (ed. G. Rodrigue), Academic Press. ISBN 978-0-12-592101-5
  • JTransforms - open source, multithreaded FFT library written in pure Java

See alsoEdit