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Stall torque

How to calculate how much weight my servo can handle?

I have a Tower Pro 9g Micro Servo (SG90) and it's datasheet says it's stall torque is (Stall Torque at 4.8 volts = 16.7 oz/in (1.2 kg/cm)), but as I haven't learned physics, I don't know how to calculate how much weight it can handle stacked on top of the arm/horn.