how do i calculate how much .50% of a move in the underlaying of the option, how much will the option move?
1) delta: you should know this already, just to have asked the question. What *is* delta? 2) Google: a serious boatload of information which (unlike so much on the Interwebs, and especially so w.r.t. trading/investing) is pretty reliable. 2.a.) shop for delta-gamma approximation, or delta-gamma-theta approximation, or Black Scholes Merton PDE for all of delta, gamma, theta, and vega. 2.b.) "tastytrade" videos will come up. The more-recent crop is pretty accurate.