Options Basics
Lot Size
Options trade in fixed bundles, not single units — that bundle is the lot size.
Definition
Lot size (contract size) is the fixed number of underlying units represented by one derivatives contract. You can't trade a single share's worth of an index option — you trade one lot, set by the exchange.
How it works on NSE & MCX
- Each F&O instrument has an exchange-defined lot size, revised periodically to keep contract value within target ranges.
- Index and stock lot sizes differ; commodities (MCX) have their own per-contract sizes.
- Always check the current lot size on the live contract — it changes over time.
Why it matters
Lot size sets the capital and risk per trade. Contract value = premium × lot size. A premium of 150 on a lot of 75 means one contract costs ₹11,250 (illustrative). It also fixes the rupee value of each point moved, so position sizing starts with the lot.
See live contracts
TradePulse's option chain shows live premiums per strike — multiply by the current lot size for contract value.