"Fantastic Adventures" was initially bedsheet-sized and had a page count of 96, which increased to 144 when the publication was reduced to pulp-size in June 1940. It was initially priced at 20 cents. With the April 1942 issue the price increased to 25 cents, where it remained for the rest of the magazine's run, and the page count went up again to 240. From June 1943 to July 1945 there were 208 pages, and the count dropped to 176 with the October 1945 issue; then to 160 in July 1948, and only two issues later, in September 1948, the page count went down to 156. It dropped again to 144 with the June 1949 issue, but rose to 160 from September 1949 to August 1950. The September 1950 issue had 148 pages, and all the remaining issues had 130 pages.