ANNOTATION: BIOPAK is a software package that contains a plant measurement library of over 1,100 documented equations that estimate plant components, e.g. leaf mass, leaf area, stem wood mass, bark mass, fuel size classes. BIOPAK can choose equations from those contained in an equation library using built-in assumptions based primarily on comparisons of plant dimensions, geographic area sampled and seral stage sampled for input data and prediction equations. Alternatively, a user can direct the program to search a specific subset of the equation library or use a particular equation for particular input data. In this manner, equations from other species may be used for species in the data for which equations are unavailable. SHORT ABSTRACT: BIOPAK (Means, et al. 1994) is a menu-driven package of computer programs for personal computers that calculates the biomass, area, height, length, or volume of plant components (leaves, branches, stem, crown, and roots) and biomass by fuels size classes using existing prediction equations. Most of the 1150 equations in the equation library currently available as part of BIOPAK were developed in the Pacific Northwest, including southeast Alaska. A few are from the northern Rocky Mountains and the Sierra Nevada Mountains. When appropriate equations are available, they can be added to this library, or new libraries can be created for other regions of the world, using the Library Editor. BIOPAK produces reports that are formatted for people and files that are compatible with other software. Other reports document the design of a computation run and the equations used. Means et al. (1996) describe the use of BIOPAK for estimating fuels of live shrubs and herbs in standard fuels size classes. A new equation library contains about 300 equations for estimating fuels for species of the Pacific Northwest and northern Rocky Mountains. DATA REQUIREMENTS: Runs with DOS-type commands. Biomass estimations are made for many species based on prescribed measurements such as diameter, stem length, cover, etc. The independent variables are equation and species specific.