Options Position Size Calculator

Choose inputs for the complete position

For a $30,000 account and an illustrative 0.8% risk allocation, the dollar budget is $240. If one complete spread can lose $225 plus $5 expected costs, enter $230 as loss per unit. The whole-unit ceiling is one. Entering only one leg’s premium would describe a different risk.

Capital required is separate. If that unit needs $500 under the broker’s preview, the risk-based quantity still needs to fit available cash. If the account has only $300 uncommitted, the unit fails that capital check even though its modeled maximum loss fits the $240 risk budget.

Three similar trades can expose the account to three losses in the same event. Include correlated holdings before interpreting the result as capacity. For assignment, consider the interim stock or cash position rather than assuming a matched expiration loss is the largest funding requirement.

The calculator rounds an input-based ceiling down; it cannot verify the loss bound. An estimated stop loss is not equivalent to a contractual maximum, and an unlimited-risk position needs a different analysis. Recalculate after equity, contract terms or trade structure changes.