Diameters of Chir Pine (Pinus roxburghii) trees were measured at 6 inches (15 cm) interval from ground level up to 7.5 feet (2.28 meters). Each set of diameters had a strong linear correlation with diameter breast height. Separate straight line regression equations were developed using sets of diameters at different heights as independent variable and diameter breast height as dependent variable. Estimations of diameter breast height were done from these equations against diameters ranging from 0.5 to 47 inches (1cm to 120 cms) at different height along the stem from ground level up to 7.5 feet (2.28 meters).