Lot Size Basics
Minimum quantity you can trade in F&O. Set by NSE, changed periodically.
Major Indices
- Nifty 50: 50 units
- Bank Nifty: 15 units
- Nifty Bank: 15 units
Top Stocks
- Reliance: 250 shares
- TCS: 175 shares
- HDFC Bank: 550 shares
Finding Lot Sizes
Check NSE website or your broker platform for current lot sizes.
How NSE Sets and Revises Lot Sizes
Lot size is the minimum number of shares an F&O contract covers. NSE fixes each stock's lot so the notional value of the contract stays inside a manageable band, currently targeting roughly ₹5-10 lakh per contract for most single-stock derivatives. When the spot price rises, the lot size is revised downward on the next half-yearly review; when the price falls, the lot is bumped up. Index contracts, by contrast, use a fixed multiplier of the index level.
Why Lot Size Matters to Retail Traders
- Margin: A larger lot demands proportionally larger margin, shrinking the number of contracts a small account can hold.
- Risk: Each point of adverse movement costs lot size times the multiplier; a big lot makes position management more sensitive.
- Liquidity: Contracts clustered at round lots trade tighter; thin lots in mid-caps may lack continuous quotes.
Index Lot Sizes as of the Latest Review
- Nifty 50: 75 shares per contract.
- Bank Nifty: 25 shares per contract.
- Nifty IT: 105 shares per contract.
- Nifty Financial Services: 60 shares per contract.
- Nifty Midcap Select: 150 shares per contract.
- Nifty Next 50: 45 shares per contract.
These values are revised based on the average price band and change from review to review; always verify the current lot on the NSE download futures/options contracts page before sizing any position.
F&O Stock Lot Sizes and Money Calculation
For single stocks the lot appears on the NSE contract page as the cover for one contract. If a stock trades at ₹1,250 and the lot is 500 shares, one futures contract controls ₹6.25 lakh of exposure. Multiply your projected adverse move in rupees by the lot size to find the rupee risk per contract; that number, divided into your total risk budget, decides how many contracts you may hold.
Lot Size Changes Mid-Contract
When a lot-size revision is announced, it applies to new contracts from the next expiry onward, so an open position keeps trading on the old lot until it lapses. Do not assume your existing contract re-size automatically; check the contract note for the lot printed at entry and compute exit P&L on that basis. A large corporate-action-driven jump in price is exactly when lot revisions get mixed into settlement reports.
Position Limit Interplay
Position limits for index derivatives are dynamic and far higher than stock limits, while stock F&O position limits scale with market-wide gross position across contracts. Retail traders rarely hit index limits but can approach stock limits on concentrated positions. Keep a running notional count; combining the stock's lot size with the published position cap tells you whether a two-contract position is even permissible.
Reading Lot Size Off a Contract Note
The lot size is the contractual multiplier printed on every NSE F&O contract. One Nifty contract is a stated number of index units - for index options the lot has changed over the years as the index has risen, since NSE reviews size so that the underlying value of one lot stays practical for retail. The pattern is simple: whenever the index climbs for a sustained stretch, the exchange multiplies the notional value and cuts the lot, keeping each contract roughly in a workable rupee band. Never assume last year's lot size; the current figure on any expiry sits in the NSE contract master file and in your broker's terminal.
Index Notional: The Math That Matters
The economic meaning of a lot is not the number of shares but the notional exposure. Multiply the lot by the spot index level to find the contract value, then multiply by the premium per unit for your rupee liability. On an index near 26,000 with a lot of 75, one contract covers about 19.5 lakh rupees of notional exposure, while the same trade on a bank index contract at a different multiplier covers a very different amount. Sizing a position by notional rather than by lot count prevents the classic error of believing one contract equals one risk unit.
Premium Cost at Different Lot Sizes
The premium you pay or receive scales linearly with the lot: a 40-rupee unit premium on a 75-lot contract moves 3,000 rupees per index point, while the same 40-rupee unit on a 40-lot contract moves 1,600 rupees. That arithmetic decides whether an 8-point stop costs 600 rupees or 320 rupees on the same strategy. Build a table for each instrument you trade listing lot, notional at current spot, and per-point rupee movement, and keep it at the desk. Every losing day in an options book can be traced to a moment when position sizing used the wrong column.
Lot Size Changes Mid-Contract
NSE reviews lot sizes roughly twice a year, and the change applies across all outstanding expiries on the effective date. Existing positions are simply re-notionally valued at the new multiplier; the contract value you hold stays constant, but the number of units changes. This sounds theoretical until a weekly expiry straddles a review date and your 2-lot position silently becomes a different count. Check the circular before the expiry week on which a change is due, because your broker's margin and your accidental position limits both move with the multiplier.
Position Limits and the Lot Size Connection
The exchange enforces market-wide position limits as multiples of the lot: an index derivative position limit is a fixed multiple of the contract value, which translates into a maximum number of every given instrument's contracts. A smaller lot means you can hold more contracts before the limit, which is the entire reason lot reviews matter to large option writers. Retail traders rarely approach the limit, but writers building substantial spreads should calculate their limit in rupees of notional early, because breaching the market-wide position limit triggers random inspections and margin penalties that none of the strategy blogs mention.
- Confirm the lot size from the contract master each quarter.
- Size positions by notional exposure, not by contract count.
- Convert premium and stops to per-point rupee movement.
- Watch review circulars for mid-contract multiplier changes.
- Track rupee notional against the instrument's position limit.
Margin versus Lot: The Rupee Reality
The lot decides the premium line, but the margin requirement decides how many lots the account can actually open. Compute your strategy's structures under the exchange's margin model - the requirement for a credit spread is the strike width times the lot plus the exchange's add-ons, while a naked short demands a far larger base margin that scales with volatility. The discipline converts the lot table into the account's dialect: the rupee capital supports a certain lot count of any given strategy, and exceeding it is leverage the margin call eventually prices. Recompute the feasible lot count on every margin-rule change and every major index move, because models bind tighter in a spike and the trader who sized for the calm version discovers the ceiling exactly when the market tests it.
