SPAN + Exposure
Margin Calculator
Add SPAN and exposure margin into one total from your contract value and your broker's current rates — no hardcoded percentages.
Margin inputs
SPAN and exposure rates are set by NSE/exchange and change continuously — take the current % from your broker. We never hardcode them.
Total margin
How it's calculated
The total margin to carry an F&O position is the SPAN margin plus the exposure margin. Both are a percentage of the contract value:
- Contract value = the notional you enter directly, or spot × lot size.
- SPAN margin = contract value × SPAN % ÷ 100.
- Exposure margin = contract value × exposure % ÷ 100.
- Total margin = contract value × (SPAN % + exposure %) ÷ 100.
SPAN and exposure percentages are set by the exchange (NSE), revised continuously with volatility, and differ by instrument and broker — so this tool asks you to enter the current rates yourself rather than assuming any. Read them off your broker's or the exchange's margin file.
Example: contract value ₹17,62,500 (spot 23,500 × lot 75), SPAN 10%, exposure 3%. SPAN margin = 17,62,500 × 10 ÷ 100 = ₹1,76,250. Exposure margin = 17,62,500 × 3 ÷ 100 = ₹52,875. Total = 17,62,500 × 13 ÷ 100 = ₹2,29,125.
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FAQ
What is SPAN margin?
SPAN (Standardised Portfolio Analysis of Risk) is the core risk margin blocked by the exchange to cover the worst-case one-day loss on a derivatives position. It is derived from a SPAN risk file and moves with volatility.
What is exposure margin?
Exposure margin is an extra buffer collected on top of SPAN for extreme moves and liquidity risk. Total carry margin = SPAN margin + exposure margin.
Why do I enter the percentages myself?
SPAN and exposure rates are set by NSE, revised continuously, and vary by instrument and broker. We never hardcode them — take the current figures from your broker or the exchange.