Lot Size
Lot Size is the fixed number of units in one options contract — the multiplier that scales premium, P&L, and margin.
What Lot Size Means
Lot Size is the standardised quantity of the underlying represented by a single options or futures contract. Index options cannot be traded in single units — they trade only in whole lots. The lot size is the multiplier that converts a per-unit premium quote into actual rupee exposure, profit, loss, and margin.
Every Nifty or BankNifty trade is sized in multiples of the lot, so position sizing always works in lot units, not rupees of premium alone.
How Lot Size Scales a Trade
A premium of ₹120 looks small until multiplied by the lot. With a Nifty lot size of 75, one lot of that option costs ₹120 × 75 = ₹9,000. A one-rupee change in premium moves P&L by ₹75 per lot. For BankNifty, with a lot size of 35, the same one-rupee move is ₹35 per lot. Lot size therefore directly determines how much risk each contract carries.
Lot Size in the Indian Market
On NSE, the Nifty lot size is 75 and the BankNifty lot size is 35 (lot sizes are periodically revised by the exchange). These multipliers drive both the cost of buying premium and the SPAN margin required for selling. Quintal Mind's leg popups compute position value and net premium per lot so the rupee impact of each trade is clear before you place it.
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