Been spending some of this evening looking on torque information for brushless motors: this is what I found. Is it right?

KQ (Constant Torque) = 30/(piKV)

From there

Q (Torque) = KQ(I - io)
With 'I' being current and 'io' being internal resistance in ohms

Theoretically, this'll give you the torque produced (assuming 100% efficiency) at a given amperage input.

However, I have no idea if this is right. Could anyone give me a hint? (I'm not great at math. I scraped past the GCSE.)