Options Buy Calculator

What is Options Buy Calculator?

Calculate how many option lots you can buy with your available margin, plus target profit and stop loss levels for smarter position sizing. 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

Contract Value = Premium × Lot Size | Max Lots = Available Margin ÷ Contract Value | Target = Premium × (1 + Profit%) | SL = Premium × (1 − SL%)

Enter premium per share and lot size to calculate contract value per lot. Divide available margin by contract value to find max lots. Target and SL are calculated as percentage of the premium.

How to Use This Calculator

Enter the premium per share
Enter the lot size (Nifty=65, BankNifty=30)
Enter your available trading margin
Enter target profit percentage
Enter stop loss percentage
View max lots, margin usage, target and SL levels

Worked Example

Why Use This Tool?

Know exactly how many lots to buy based on your margin
Set realistic profit targets based on premium percentage
Plan stop loss levels before entering the trade
Understand margin utilization percentage
Calculate exact profit/loss in rupees for target and SL

Frequently Asked Questions

How many Nifty lots can I buy with ₹50,000?

If Nifty premium is ₹150 and lot size is 65, contract value = ₹9,750. With ₹50,000 margin, you can buy 5 lots (50,000 ÷ 9,750 = 5.12, rounded down to 5). Margin used = ₹48,750 (97.5%).

What happens if the premium decreases after I buy?

If premium drops below your stop loss level, your position will incur a loss. The calculator shows exactly how much you lose at your SL%. For example, a 10% SL on ₹150 premium = ₹135. Loss per lot = ₹975. For 5 lots, total loss = ₹4,875.

Can I use this calculator for puts as well?

Yes. The calculations work for both call and put options. Simply enter the premium of the put option you are planning to buy.

What is the lot size for Nifty and BankNifty?

As of 2026: Nifty = 65 units per lot, Bank Nifty = 30 units per lot, Fin Nifty = 40 units per lot, MidCap Nifty = 75 units per lot. Lot sizes are revised periodically by NSE — always verify on the NSE website.

Explore more options & derivatives calculators or try our other free financial tools.

Disclaimer: Results from this calculator are estimates for educational purposes only. Actual returns may vary due to market conditions and other factors. Please consult a SEBI-registered financial advisor before making investment decisions.

About Options Buy Calculator

Calculate how many option lots you can buy with your available margin, plus target profit and stop loss levels for smarter position sizing.

This calculator belongs to the Options & Derivatives category. Explore more options & derivatives calculators.

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