What is Options Sell Calculator?
Calculate option selling position size based on NSE margin requirements, premium income, and stop loss levels for option writers. Simply enter your values, and the calculator instantly computes accurate results using standard financial formulas. All calculations are performed entirely in your browser — nothing is stored or transmitted.
Formula Used
Enter premium received per share and lot size. Margin per lot is the SPAN + Exposure margin blocked by NSE. Premium income is your max profit. Stop loss is triggered when premium rises by the SL% against your position.
How to Use This Calculator
- Enter the premium received per share for selling
- Enter the lot size (Nifty=65, BankNifty=30)
- Enter margin per lot as per NSE SPAN + Exposure (update from your broker)
- Enter your available trading margin
- Enter stop loss percentage (when premium rises against you)
- View max lots, premium income, margin used, and SL loss
Worked Example
Premium: ₹150 | Lot: 65 | Margin/Lot: ₹65,000 | Available: ₹5,00,000 → 7 lots | Premium Income: ₹68,250 | SL 50% (₹225): Loss ₹34,125 | Reward:Risk = 1:0.5
Why Use This Tool?
- Know exactly how many lots you can sell based on NSE margin
- Calculate total premium income before entering a trade
- Plan stop loss levels to protect against adverse moves
- Understand margin utilization across positions
- Calculate reward-to-risk ratio for option writing
Frequently Asked Questions
What margin is required for selling Nifty options?
NSE requires SPAN margin (based on VaR) + Exposure margin. For selling ATM Nifty options, expect ₹60,000-₹80,000 per lot depending on volatility and time to expiry. Check your broker dashboard for exact figures.
What is the maximum profit in option selling?
Maximum profit for an option seller is the total premium received. The option seller keeps this full amount if the option expires worthless (OTM). Profit is capped at the premium, while risk can be substantial.
How does stop loss work for option sellers?
Option sellers lose money when premium rises. For example, if you sell at ₹150 and premium rises to ₹225 (+50%), you lose ₹75 per share = ₹4,875 per Nifty lot. Set a SL % to limit losses before they escalate.
What is a good reward-to-risk ratio for option selling?
For option selling, a reward-to-risk ratio of 1:2 or better is preferred. E.g., premium income ₹10,000 with max acceptable loss ₹20,000 at SL. Since max profit is capped, tight SL management is critical for option sellers.
Explore more options & derivatives calculators or try our other free financial tools.