Akilogram is an si unit. which quantity might you measure in kilograms?

Since weight of a body is nothing but Mass of the body multiplied by acceleration due to gravity acting on it, the SI unit of weight will be the same as the SI unit of force (mass x acceleration), that is, Newton.

However, you may note that since the acceleration due to gravity is different on different heavenly bodies, the value of weight will be different on different bodies, unlike the mass, which is the same throughout the universe.

I hope this helps! :)