Resumo. The objective of this study was to calculate simple allometric equations in order to estimate above and below ground dry biomass from Leucaena leucocephala individuals. Results indicated that biomass components show the following pattern: stem > branches > roots > leaves. Independently from individual size, 24 % of total sampled dry biomass was located below-ground, and 76 % above-ground. Log transformed linear equations using CBH (circumference at breast height) as independent variable was statistically significant (P<0.05) to estimate leucaena total dry biomass.