The objective of this study was to establish weight estimation equations from body measurements applicable to Lagune cattle. Live weight (LW), body length (BL), heart girth (HG), and withers height (WH) were recorded in 909 Lagune cattle (506 males and 403 females) aged from 0 to 45 months at the Samiondji Breeding Farm in southern Benin. The correlation of weight with the BL (males - 0.95, females - 0.80) or with the HG (males - 0.96, females - 0.97) was higher than with the WH (males - 0.92, females - 0.79). Several types of equations between the weight and the three body measurements were compared. The equations retained for the Lagune cattle were polynomial regressions of the predicted weight (Y) on the BL (x), the HG (z) and the WH (t): Y = -77.29 - 0.07x + 1.47z + 0.18t for males and Y = -1.31 + 1.74x + 1.77z - 1.99t for females. The coefficients of determination R2 were 0.95 and 0.94 for the respective males and females, while the Mallows coefficients were identical Cp = 4.00. The residual means of differences between observed and predicted weight were small (2.6 vs. 4.2 kg for the respective males and females) indicating good accuracy of the estimates.