How is put margin calculated?

Margin for short puts is typically 15-25% of the strike price times 100 shares, plus the option premium, minus any out-of-the-money amount. Brokers use proprietary models—this calculator gives an approximate estimate.

Does margin differ from cash-secured puts?

Yes. Cash-secured puts require full strike × 100 in cash. Margin puts use a fraction of that as buying power, but you take on leverage risk.

Put Margin Requirement Calculator

Estimate the buying power (margin) required to sell puts. Broker rules vary—verify with your broker.

Strike price

Number of contracts

Margin rate (%)

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