Watt does volts x amps, but volts = watts / amps. Watts varies with rpm, so you're really asking for a curve, not one piece of data. Some companies quote maxx watts, which I assume would be at some peak rpm, but they're usually not given together, so you really don't know for sure what rpm or other conditions the maxx watts occurs at. There are no industry standards for testing BL motors so there's really no standard available for comparison.