Notional value, also called notional principal, is the total face value of a derivatives contract — representing the underlying asset exposure controlled by the contract, rather than the actual amount of capital invested or exchanged. For example, one lot of Nifty 50 futures (comprising 25 units at a Nifty level of 24,000) has a notional value of ₹6,00,000 — but the investor only needs to deposit an initial margin of approximately ₹80,000 to ₹1,00,000 to control this exposure. The notional value is the basis for calculating P&L, margin requirements, and hedging ratios in derivatives markets. In India, regulatory reporting of derivatives market activity uses notional value to express the scale of the market — NSE's daily F&O turnover in notional terms routinely exceeds ₹500 lakh crore, dwarfing the cash equity market. For hedgers calculating how many futures contracts to use to hedge a portfolio, the notional value of the contracts must match (as closely as possible) the market value of the portfolio being hedged.