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Calculate lot sizes, position value, and risk-based sizing for Nifty, BankNifty, FinNifty, and stock futures/options — instantly.
Lot Size
65
units / lot
Position Value
₹14.63 L
1 lot
Risk Amount
₹5,000
at 1% risk
Suggested Lots
1
for 1% risk
For educational purposes only. Verify lot sizes on NSE before trading. Past performance does not guarantee future results.
| Index / Stock | Lot Size | Approx. Lot Value |
|---|---|---|
| Nifty 50 (index) | 65 units | ~₹1.5L |
| BankNifty (index) | 30 units | ~₹1.5L |
| FinNifty (index) | 60 units | ~₹1.2L |
| MidcapNifty | 120 units | ~₹1.5L |
| Sensex (BSE) | 20 units | ~₹1.6L |
| Reliance (stock F&O) | 250 units | Varies |
| TCS (stock F&O) | 150 units | Varies |
| HDFC Bank (stock F&O) | 550 units | Varies |
NSE revises lot sizes periodically. Always verify current lot sizes on NSE's official website before trading.
Position Value = Spot Price × Lot Size × Number of Lots
Example: Nifty at 22,500 × 75 (lot) × 2 lots = ₹33,75,000 notional
An F&O contract is not sold by the unit. The exchange fixes how many units make up one contract — the lot size — and every trade is a whole multiple of it. You can buy 1 lot or 4 lots of Nifty; you cannot buy 90 units. That single constraint shapes the smallest position you can take and the smallest risk you can accept.
Lot sizes are set so a contract's notional value stays inside a target band. When the underlying index climbs, the same number of units represents more money, so the exchange trims the lot size to bring contract value back into range. That is why Nifty moved from 75 units to 65 in January 2026, and why the number will change again.
The most expensive misunderstanding in Indian derivatives is treating margin as the size of the position. With Nifty near 22,500, one lot of 65 units carries ₹14.6 lakh of notional exposure. The margin a broker asks for is a fraction of that, and buying an option costs only the premium. Your profit and loss move against the notional value, not against the margin — which is how a trader with ₹2 lakh in the account ends up carrying ₹30 lakh of exposure without registering it.
Because positions round to whole lots, your intended risk and your actual risk rarely match exactly. If your risk limit works out to 1.9 lots, you take 1 and risk less than planned. If it works out to 0.8 lots, the honest answer is that the trade does not fit your account at that stop distance — taking one lot anyway means exceeding the limit you set. Our position size calculator does this rounding for you and shows the risk you are actually taking.
One further trap: when a lot size is revised, contracts already listed keep the old size until they expire. Two expiries of the same index can therefore trade with different lot sizes simultaneously. Sizing the far month using the near month's lot count is a quiet and common error.
Nifty trades in lots of 65 units following the revision effective January 2026, down from 75. BankNifty is 30, FinNifty 60, MidcpNifty 120 and Nifty Next 50 is 25. NSE revises these periodically, so confirm against the live table above or the NSE circular before placing a trade.
Lot sizes are set so that one contract stays inside a target notional value band. As the underlying index rises or falls, the number of units per lot is adjusted to keep the contract value in that range. That is why a rising index tends to see its lot size cut.
Multiply the spot price by the lot size. Nifty at 22,500 with a lot size of 65 gives a notional value of ₹14,62,500 per lot. This is the exposure the contract represents, not the cash needed to trade it.
No. Notional value is the full exposure; margin is the deposit the broker holds against it, typically a fraction of notional for futures and short options. Buying options requires only the premium. Confusing the two is why traders take positions far larger than they intend.
Lot size is fixed by the exchange — you cannot trade a fraction of one. Position size is your own decision about how many lots to take, derived from your capital and stop-loss. The lot size sets the granularity you have to round your position size down to.
Yes. Every stock in the F&O segment has its own lot size, set individually so contract value lands inside the required band. They range from a few hundred units for expensive stocks to several thousand for cheaper ones, and are revised on their own schedule.
Existing contracts continue with the old lot size until they expire. The revised size applies to newly introduced contracts. This means two expiries of the same index can carry different lot sizes at the same time, which is a common source of position-sizing errors.
It lowers the notional value and therefore the margin for one lot, so the minimum ticket size falls. It does not reduce per-trade costs proportionally — STT, exchange charges and GST scale with turnover, and brokerage is often per order rather than per unit.
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