Answer
Expressed in base units, the SI unit for weight is $\frac{kg\cdot m}{s^2}$
Work Step by Step
$Weight = mg$
The units of weight are $kg\times m/s^2 = \frac{kg\cdot m}{s^2}$
Expressed in base units, the SI unit for weight is $\frac{kg\cdot m}{s^2}$