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All you can do is get in the ballpark knowing resistance of windings and the supply voltage. Current = Voltage divided by resistance.

Wattage = voltage x current x power factor. For a motor the power factor is between zero and sone number less than one, with one being just a resistive load. So if you calculate the current and use a PF = 1 you can get worse case wattage.

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Q: How do you calculate motor wattage from its resistance?
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