Notional Value

Notional value is the total underlying amount that a derivative contract or leveraged position controls, calculated from the quantity of the underlying asset multiplied by its current price. It measures exposure rather than the capital posted to hold the position, which is why a small margin deposit can carry a large notional. The same word also appears in accounting and interest rate swaps to describe a reference principal on which payments are computed without that principal ever changing hands.

How it works

Notional value equals contract size times the underlying price. A position of 10 ETH perpetual contracts with ETH at 2,000 carries a notional value of 20,000. If the trader posts 2,000 of margin against that position, the notional is ten times the collateral, reflecting roughly 10x leverage. The notional moves as the underlying price moves, so it is a live figure, not a fixed one set at entry.

On Hyperliquid and dYdX, perpetual futures express position size in units of the base asset, and the platform derives notional from the oracle or mark price to compute margin requirements and liquidation thresholds. On the CME, a single Bitcoin futures contract represents 5 BTC, so its notional is 5 times the index price. Options venues such as Deribit report notional as contracts times underlying price, separate from the premium paid, because premium and exposure are different quantities.

Why it matters

Notional value is the figure institutional risk desks use to size exposure, set position limits and aggregate counterparty risk, because posted margin understates how much market movement a book absorbs. Reported trading volumes are often notional volumes, which can overstate economic activity when leverage is high. The associated failure mode is that a position with large notional and thin margin can be liquidated by a small adverse price move, and cascading liquidations across correlated notional exposure can amplify a sell-off faster than collateral balances suggest.

Related terms

• Margin
• Leverage
• Open interest
• Mark price
• Liquidation

Frequently asked questions

How is notional value different from margin?

Notional value is the full underlying exposure a position controls. Margin is the collateral posted to hold it. Their ratio reflects leverage, so a position can carry a notional many times larger than the margin backing it.

Does notional value change over time?

Yes. Because it equals contract size times the current underlying price, notional moves as the price moves. It is a live measure of exposure, not a fixed amount recorded at the time the position was opened.

Why do reported volumes use notional value?

Derivatives venues report traded notional because it reflects the size of underlying exposure changing hands. This can overstate economic activity when positions are highly leveraged, since the capital actually committed is far smaller than the notional figure.

See the data behind this post. Browse the live perps dashboard, or read How Onchain Perp DEX Volume Is Measured for how the records are put together.

Allium provides onchain data infrastructure. Companies named in this article may be Allium customers, prospects or commercial counterparties. The authors and other Allium personnel may hold positions in the assets discussed. This article is informational only and is not investment, legal or tax advice. Data and information last reviewed: October 23, 2026.