A computer program for stem analysis has been prepared by using BASIC language. Annual-ring counts and. other input data can be directly entered for necessary calculation, and outputs are data lists, cross-section areas, age-height relationships, growth rates, total, annual, and mean increments of height, D.B.H. and volume for an individual tree. The sectional log volumes are calculated by Huber`s formula, and the growth rates by Pressler`s in this program. A copy of the program listing is in appendix I.