How do you compare electric motors to Nitro engines?

Is there a comparison of electric motors to the typical RC aircraft engine? With the Nitro motor we have .40, .46, .61 and
1.2 (I think). What would be the equivalent electric motors?

Ok, 0.049 glow engine. That's pretty typical, right? Price is about $50. Triple that is $150. Except that I can get similar performance out of a $10 motor. If the $10 motor can't do it, a $40 cobalt motor certainly will.

Actually for a larger electric, it's the battery pack that really costs a lot of money, not the motor. The motor prices tend to taper off, but the battery price doubles when you double the price, and the
ESC price goes up as well, but not quite double.

I think that's what they were after.

That does not tell what size, power or amps are equivalent.