Options Margin Calculator – Reg-T Requirements

Estimate standard Reg-T margin for covered calls, cash-secured puts, uncovered (naked) options and spreads, and see how much buying power each position uses.

A cash-secured put sets aside the full strike × 100 per contract, while a short put on margin may require much less, which increases both potential return and risk. Brokers can set higher requirements than Reg-T, so always check your broker's figures.

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