Notional Value
The total market value of a position — size multiplied by price.
Also called: position value · exposure · market value
Written by Javier Sánchez Ros
In plain language
Notional value is what your position is worth in the market, regardless of how much of your own capital funded it. 50 shares at $50 is $2,500 of notional value.
It is not the same as your risk. That $2,500 position with a $2 stop risks $100. Notional value tells you how much market you are holding; risk tells you how much you can lose.
It matters for funding. If notional value exceeds your account equity, the position requires margin, and margin brings its own set of rules.
The formula
Notional Value
Position Size × Entry Price
- Account exposure
- Notional Value ÷ Account Equity × 100
Worked through
A 1% risk that needs more capital than the account holds
- Account
- $10,000
- Risk budget at 1%
- $100
- Entry $210, stop $209.50
- $0.50 per share
- Position size
- 200 shares = $42,000
The risk is textbook: $100, exactly 1%. The stop is 50 cents away, so 200 shares is the correct size, and 200 shares of a $210 stock is $42,000 of stock against a $10,000 account.
Nothing was calculated wrongly. Risk and notional are simply different quantities, and a very tight stop pushes them far apart — the tighter the stop, the larger the position needed to put the same money at risk. On a cash account this trade cannot be placed at all; on margin it can, at four times leverage, for a 1% risk.
That is the number worth checking before the order goes in. It decides whether you can fund the trade, what margin it consumes, how much buying power is left for anything else, and what a gap would do — because a gap does not respect the 50-cent stop, and it acts on the full $42,000.
Risk tells you what the plan costs when it works as intended. Notional tells you what you are actually holding when it does not.
Why it matters
A correctly sized trade with a tight stop can still produce a position far larger than your account. Knowing your notional value tells you whether you can actually fund it.
Common mistakes
- Confusing notional value with the amount at risk.
- Discovering only at order entry that the correct position size needs margin.
Keep exploring
These concepts are connected. Understanding one usually makes the next one easier.
The amount of an asset you buy or sell in a single trade.
Using borrowed capital to control a position larger than your account balance.
The capital your broker requires you to post to open and hold a leveraged position.
The gap between your entry and your stop loss — your risk on a single unit.
The fixed share of your account you are willing to lose on any single trade.