What is Lot Size in F&O? Why Lot Size Matters for Derivatives
Lot size is the minimum number of shares or units you must buy or sell in a single F&O (Futures and Options) contract. Unlike equity trading where you can buy even one share, derivatives require you to trade in fixed lots. You cannot buy half a lot or a quarter of a lot.
When you buy one lot of NIFTY 50 futures, you are getting exposure to a specific number of NIFTY units. You cannot buy just 10 NIFTY futures units. You must buy the full lot. This means the minimum capital required for any F&O trade is determined by the lot size multiplied by the price and the applicable margin percentage.
How is lot size determined?
SEBI and the exchanges determine lot sizes with the objective of keeping the minimum contract value within a defined range, typically between Rs.5 lakh and Rs.10 lakh. If a stock's price changes significantly, the exchange may revise the lot size to keep the contract value within this range.
Lot sizes are revised periodically. When a stock's price rises substantially, the lot size is usually reduced to keep the contract accessible. When the price falls, the lot size may be increased. SEBI announces lot size changes in advance so traders can adjust their positions.
Why does lot size matter for traders?
| Impact | How Lot Size Affects You |
|---|---|
| Minimum capital needed | Larger lot = more margin required to trade |
| Position sizing | You can only increase or decrease exposure in lot multiples |
| Risk per trade | Larger lots mean each point movement has a bigger rupee impact |
| Accessibility | Very large lots can make some contracts inaccessible to small traders |
Where can I find current lot sizes?
NSE publishes current lot sizes for all F&O contracts on its website. Lot sizes can change every few months when SEBI revises them. Your broker's F&O platform will also show the current lot size when you select a contract. Always verify the lot size before placing an F&O order because changes can happen without much notice.
Access F&O trading at stockk.trade/products/fno.
F&O trading involves substantial risk. Losses can exceed your initial investment. This article is for educational purposes only.
Frequently Asked Questions
Can I trade less than one lot in F&O?
No. One lot is the minimum tradeable unit. If the lot size is 250 shares and you want exposure to only 100 shares, F&O is not the right instrument for that position. You would need to buy individual shares in the cash market instead. F&O is designed for lot-based trading only.
Why do different stocks have different lot sizes?
Lot sizes are set so that the minimum contract value falls within SEBI's prescribed range. A stock trading at Rs.5,000 per share will have a smaller lot size than one trading at Rs.500 per share, so that both contracts have roughly similar minimum values. This standardisation ensures no single stock's F&O contract becomes disproportionately large or small.
What happens to my position when the exchange changes the lot size?
Lot size changes apply to new contracts going forward. Existing open positions in current-month contracts are not affected until expiry. When the new lot size takes effect for the next month's contracts, you trade with the revised lot. The exchange announces changes well in advance.
Is lot size the same for futures and options of the same stock?
Yes. For a given stock, the futures lot size and the options lot size are the same. One lot of Reliance futures and one lot of Reliance call options represent the same number of underlying shares.
How does lot size affect my profit and loss calculation?
Your profit or loss per lot equals the price change multiplied by the lot size. If you buy one lot of a stock with a lot size of 500 and the price moves up by Rs.10, your profit is Rs.5,000 (Rs.10 x 500). If the price moves against you by Rs.10, your loss is Rs.5,000. Larger lot sizes mean larger absolute gains and losses per point of price movement.
Investments in securities market are subject to market risks. This article is for educational purposes only and does not constitute investment advice.
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