F&O Margin Calculator 2025 — Futures, Options & Intraday SPAN Margin

Last updated: Jul 22, 2026 | Reviewed by Calkulator Team | 2 min read

Financial

Know your margin requirement before placing a trade

Whether you trade intraday, delivery, futures, or options, margin requirements vary significantly. An intraday trade might need only 20% margin, while a delivery trade needs 100%. Calculate your required capital before market opens.

Never use more than 50% of your available margin — leave room for market volatility.

Trade Details

Intraday (MIS) — 20% margin (5× leverage), auto-squared at day end

Stock / Contract Price (₹)

₹

Quantity

Lot Size

Margin Required

1%100%

20% = 5× leverage

Available Capital (₹)

₹

To calculate max lots/shares possible

Margin Formulas

Position Value = Price × Qty × Lot Size

Required Margin = Position Value × Margin% / 100

P&L / ₹1 move = Qty × Lot Size

Brokerage = ₹20 flat per order (discount broker)

Required Margin

₹—

Enter price and quantity

Position Value

₹—

Full contract size

P&L per ₹1 Move

₹—

Qty × Lot Size

Effective Leverage

—

Position ÷ Margin

Lots from Capital

—

Based on available capital

Brokerage (both sides)

₹40

₹20 flat per order

Margin

—%

Margin Required ₹—

Broker's Exposure ₹—

Margin Comparison — Same Position

Type	Margin %	Margin Req.	Leverage

Live Result Illustration

Visual summary — updates instantly as you enter values above

LIVE

Real-Life Guide to Using the Margin Calculator

F&O margin requirement estimator. Use the examples and checks below to turn the number into a practical decision.

When this calculator is useful

Reach for this before placing an intraday, futures, or options-selling trade on the NSE, when you need to know how much money will actually get blocked in your trading account as SPAN and exposure margin.

For most people, the best way to use the Margin Calculator is to try the real case first, then change one input at a time. That makes the trade-off visible. For example, with a loan calculator you can change tenure while keeping the same rate; with an investment calculator you can change return assumption while keeping the same monthly contribution; with a health, education or measurement calculator you can check how much one input changes the final category.

The result should answer a practical question: Can I afford this? How much should I save? Is this score enough? Is this measurement within range? What is the safer or cheaper option? If the output does not answer the decision clearly, adjust the inputs until the scenario matches your real situation.

Real-Life Example

Selling one Nifty put option: Anjali wants to sell 1 lot of a Nifty put option and needs to know how much of her capital will be locked before she clicks "sell" on her broker's app.

1With Nifty trading near ₹24,000 and normal volatility, SPAN margin for one lot might come to roughly ₹1,10,000 and exposure margin around ₹15,000, totalling close to ₹1,25,000 blocked — while she only receives the option premium of ₹6,000-8,000 as credit into her account.

2Now change one input, such as rate, time, quantity, unit or score, and compare the new result with the first one.

Writing an option locks up far more capital than the premium you collect, so always check the margin required before the trade, not after.

Practical Advice

Use the Margin Calculator as a planning tool, not just a number generator. Write down the inputs you used, because the final answer is meaningful only when you remember the assumptions behind it.

If the decision affects money, health, tax, safety, academics or legal compliance, keep a second check ready. That second check may be a bank quote, payslip, official rule, prescription, site measurement, mark sheet or invoice.

Common Mistakes

Confusing SPAN margin alone with the total margin requirement, forgetting exposure margin is added on top and can add another 3-5% of contract value.
Assuming option buying and option selling need the same margin — buying only requires the premium paid, while writing (selling) an option needs margin close to a futures position.
Using an old lot size in manual math after NSE revises lot sizes for an index or stock, which throws the whole margin figure off.
Ignoring that margin requirements are not fixed — they rise sharply around expiry days or high-volatility events like the Union Budget or election results.
Assuming a hedged position (like a calendar spread) automatically gets margin benefit, when some brokers only apply spread margining if the legs are placed in a specific way.

How to Interpret Results

Treat the figure shown as an estimate of funds that will be blocked, not a guaranteed number — actual SPAN files are updated daily by the exchange and can shift the real requirement by 10-15% either way, so always keep a buffer above the estimate.

A good interpretation looks at both the main result and the supporting values. If a page shows totals, ratios, categories, schedules or warnings, read those together instead of focusing only on the biggest number.

Margin Calculator FAQs

Useful answers for interpreting the output, avoiding mistakes and using the result responsibly.

What exactly does this calculator estimate?

It gives an approximate SPAN plus exposure margin figure — the total funds an exchange and broker would require you to keep aside — for a given futures or options position.

How is the margin figure derived?

It approximates the exchange's SPAN methodology, which scans a range of possible price and volatility moves in the underlying, and adds a percentage-based exposure margin on top, since the exact SPAN engine is proprietary to the exchange.

Why does buying an option need almost no margin compared to selling one?

An option buyer's maximum loss is limited to the premium paid, so only that premium is collected upfront; an option seller's potential loss is theoretically open-ended, so the exchange demands a much larger SPAN-based margin.

Will this match what my broker shows before I place the order?

It should be close, but brokers like Zerodha and Upstox pull the exchange's live SPAN file every day, so always cross-check on your broker's own margin calculator right before executing, especially near expiry.

Why does the margin jump on some days without me changing my position?

Margins are volatility-driven — a spike in India VIX or an upcoming event like a budget announcement or RBI policy day can raise SPAN requirements even for an unchanged position.

Does this account for margin benefits on multi-leg strategies?

Not reliably — spreads and hedged strategies often get a lower combined margin, but only if the broker's risk system recognizes the hedge, so treat multi-leg outputs as single-leg estimates unless stated otherwise.

What should I do with this number before trading?

Keep extra funds beyond the estimated margin in your account so a normal daily margin revision does not trigger an automatic square-off by your broker's risk management system.

Does the margin shown include mark-to-market losses?

No — initial margin is separate from mark-to-market (MTM) losses, which are calculated and debited at the end of each trading day, so a losing futures position needs additional funds beyond the original margin.

What is a Stock Market Margin Calculator?

Margin in stock trading is the minimum collateral (cash or securities) you must maintain to take a leveraged position. SEBI mandates SPAN + Exposure margins for F&O positions. For intraday equity trades, brokers offer 5–20× leverage, meaning you can control ₹10 Lakhs of stocks with ₹50,000–₹2 Lakh in your account.

Understanding margin requirements is critical — if your account value drops below the maintenance margin, you get a margin call requiring immediate top-up. This calculator computes required margin, maximum position size, brokerage, and profit/loss per point move for intraday and F&O trades.

Example Calculation

Scenario: Intraday long in Reliance at ₹2,850 for 100 shares, 20% margin

1Position value = 100 × ₹2,850 = ₹2,85,000

2Required margin = ₹2,85,000 × 20% = ₹57,000

3P&L per ₹1 move = 100 × ₹1 = ₹100

✓ ₹57,000 margin controls ₹2.85L position — 5× leverage

Frequently Asked Questions

Stock margin and F&O trading explained

What is the difference between SPAN and Exposure margin in F&O trading?

SPAN (Standard Portfolio Analysis of Risk) is the exchange-mandated minimum margin — it covers the maximum one-day loss under extreme market moves. Exposure margin is an additional buffer above SPAN. Total F&O margin = SPAN + Exposure. SPAN changes daily with volatility; it rises during high-volatility events (elections, RBI meetings), potentially triggering margin calls even without price movement.

How is intraday leverage different from delivery margin?

Delivery (CNC): 100% margin required — full price paid, shares credited to demat, held indefinitely, STT 0.1% both sides. Intraday (MIS): typically 20% margin (5× leverage), must close by day end, STT only 0.025% on sell side. Post SEBI's Peak Margin regulations (Dec 2021), intraday leverage was significantly reduced — most brokers now offer 5× or less.

What happens if my account balance drops below the required margin?

You receive a margin call — add funds by next trading day's start, else the broker auto-squares your position (with extra charges) at an unfavorable price. Worse, if the position moves further against you, your account can go negative and you're liable for the deficit. Always maintain 20–30% buffer above minimum margin.

Stock Market Margin Calculator