Options Position Size Calculator

Position sizing limits how much one trade can hurt your account. Enter your account size, the percentage you are willing to risk and the trade's strike or maximum loss to see how many contracts fit.

The calculator also warns when one underlying would take up a large share of your capital. Many traders keep any single stock to a modest slice of the account so that one assignment or gap down does not dominate results.

Results are educational estimates from standard formulas, not investment advice. Live prices, fees and your broker's rules can change the outcome.