The overhaul, which includes a new-look front cover and extra editorial sections, coincides with the release of ABC circulation figures for the first half of 2004, out in August.
Circulations of men's monthlies are expected to fall after increased competition in the men's market following the introduction of the weekly titles Nuts and Zoo.
The FHM overhaul follows a ten-month period of consumer research. More prominent use of the logo on the front cover is designed to underline the brand and additional editorial sections will include a new style section called "Insider" and a section called "The FHM Book of Lists" to replace its music, film and book review pages.
A three-month advertising campaign, created by NMI, will run from August to support the redesign.
In the July-to-December 2003 period, FHM posted an ABC of 601,166, down 3 per cent on the previous year. However, some sources are predicting sales of FHM and its rival, Loaded, will be down as much as 15 per cent across the January-to-June period.
The market has already seen fall-out with the closure of Dennis Publishing's Jack last week. Competition is set to increase when H Bauer launches its lads' weekly, Cut.
James Carter, the publishing director of FHM, said: "FHM maintains its dominant position in the men's magazine market through its commitment to refreshing and re-invigorating its editorial content on a regular basis. This ongoing development ensures we deliver the most relevant, quality content."