NSE F&O Calculator

F&O Margin & Charges Calculator

Calculate exact margin requirements, STT, stamp duty, GST, SEBI fees, and brokerage for Nifty, Bank Nifty, FinNifty, and stock F&O. Compare total costs across Zerodha, Angel One, Groww, and Upstox.

1 Select Instrument

Current Bank Nifty level
ATM for options, N/A for futures
Option premium per unit. For futures, leave as entry price difference.
Lot size: 15 | 1 lot = 15 units

2 Trade Settings

ITM exercise has 10x higher STT — critical for tax planning

Margin & Cost Summary

Total Margin Required
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Total Charges
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Contract Value
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Break-Even Points
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Price move to cover costs
SPAN Margin
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Exposure Margin
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Premium Outflow
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Detailed Charges Breakdown

ChargeRateOnAmount (₹)

Broker Cost Comparison — Same Trade

Total cost of this exact trade on each broker (brokerage + taxes + charges):

Quick Reference — Lot Sizes & Margin Estimates

InstrumentLot SizeTick SizeApprox. OTM Sell Margin (1 lot)Approx. ATM Sell Margin (1 lot)
Bank Nifty15₹0.05₹45,000 - ₹65,000₹90,000 - ₹1,20,000
Nifty 5025₹0.05₹50,000 - ₹70,000₹1,00,000 - ₹1,40,000
FinNifty25₹0.05₹25,000 - ₹40,000₹50,000 - ₹70,000
MidcpNifty50₹0.05₹30,000 - ₹50,000₹60,000 - ₹90,000
Sensex (BSE)10₹0.05₹40,000 - ₹60,000₹80,000 - ₹1,10,000

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Disclaimer: Margin requirements are estimates based on approximate SPAN calculations. Actual margins are set by NSE/BSE and change daily based on volatility. STT, stamp duty, and regulatory charges are based on current SEBI/government rates as of April 2026. Verify exact charges with your broker before trading. F&O trading involves substantial risk of loss. This is not financial advice.

Frequently Asked Questions

How is F&O margin calculated?
F&O margin = SPAN + Exposure margin. SPAN is risk-based (set by NSE daily). Exposure is additional collateral (3-5% for indices, higher for stocks). Option buyers pay only premium. Option sellers need full margin.
What is STT on F&O?
Options: 0.0625% on premium (sell side). Futures: 0.0125% on sell side. ITM exercise: 0.125% on intrinsic value — 10x higher, which is why traders square off before expiry.
Which broker is cheapest for F&O?
Most discount brokers charge ₹20/order flat. The real cost difference is in margins and platform. Compare total cost including STT, stamp duty, GST — not just brokerage.
What is Bank Nifty lot size?
Bank Nifty: 15 units. Nifty: 25. FinNifty: 25. MidcpNifty: 50. Sensex: 10. Lot sizes are set by NSE and revised periodically.
Why is STT on exercised options so high?
STT on exercise is 0.125% on intrinsic value (not premium). Deep ITM positions can incur hundreds of rupees in STT. Always square off ITM positions before 3:25 PM on expiry day.