What is notional value? The position size fees are charged on

CoTrading editorial team 2026-09-23

Notional value is the full market value of the exposure a position gives you — quantity times price for a simple linear contract — regardless of how much margin you posted to hold it.

A position with 1,600 of margin behind it at 10× is a 16,000 position. Fees, funding, maintenance margin tiers and position limits are all computed on the 16,000. This page shows how to compute notional for the contract types you will meet, which number each cost is charged on, and where the “how big is my position” question goes wrong.

Why this matters now

Order tickets and position screens show several numbers side by side: quantity, margin, notional, sometimes a contract count. Which one a venue labels “size” varies, and the margin is usually the smallest and most prominent.

That invites a specific error: thinking about the position in margin terms. “I have a 1,600 position” sounds modest. The market does not care about the 1,600. Every price move, every fee and every funding payment is applied to the notional, and at 10× that is ten times the number you were looking at.

How it actually works

Notional depends on how the contract is specified. All figures below are illustrative.

Linear contract, sized in the base asset. notional = quantity × price. A long of 0.25 units at 64,000 is 0.25 × 64,000 = 16,000 in the quote currency.
Contract with a multiplier. Some contracts represent a fixed fraction of the asset. notional = contracts × multiplier × price. 40 contracts with a 0.01 multiplier at 3,200 is 40 × 0.01 × 3,200 = 1,280.
Inverse contract, sized in dollars. Each contract has a fixed USD face value, so notional is constant in dollars and changes in coin. 500 contracts of 10 USD face value is 5,000 USD — which is 0.1 coin at 50,000 and 0.125 coin at 40,000. The consequences of that are covered in inverse vs linear contracts.
It moves with price. Entry notional is fixed at the fill. Current notional is recomputed at the venue’s reference price — often a mark price rather than the last trade. The long of 0.25 units is 16,000 at entry and 17,500 if price reaches 70,000.

The distinction in step 4 matters because different costs use different ones.

What gets charged on notional

Cost or rule	Computed on	Consequence
Trading fee, entry	Entry notional	Paid when the position opens
Trading fee, exit	Exit notional	Larger on a winning long, smaller on a losing one
Funding (perpetuals)	Current notional at each settlement	Grows as a winning position grows
Maintenance margin tier	Current notional	A growing position can cross into a higher tier
Position limits	Notional or quantity, per the venue	Leverage does not buy extra room

A worked example with an illustrative 0.05% taker fee on the 0.25-unit long: entry fee 16,000 × 0.0005 = 8.00; exit fee at 70,000 is 17,500 × 0.0005 = 8.75. The margin you posted appears nowhere in either calculation. The trading fee calculator runs this with your own rates.

Notional vs margin: the confusion that costs money

Because fees are charged on notional and margin is notional divided by leverage, a fee rate measured against your margin is the fee rate multiplied by your leverage.

Same 16,000 position, same illustrative 0.05% per side:

Leverage	Margin posted	Round-trip fee	Fee as % of margin
10×	1,600	16.00	1.0%
20×	800	16.00	2.0%

The fee in currency did not change. What changed is how large it looks against the collateral — which is the denominator an exchange uses for the return percentage it displays prominently. That is why a strategy with a small headline edge can show a healthy return on margin and a thin one on the account; fee drag over a year works through how it accumulates with turnover.

Funding behaves the same way. At an illustrative 0.01% per settlement and three settlements a day, the 16,000 position pays 16,000 × 0.0001 × 3 = 4.80 a day. Over 30 days that is 144 — 9% of a 1,600 margin, from a rate that sounds negligible. The interval and the rate are venue- and market-specific; the funding rate calculator takes both as inputs.

Notional across several positions

Add up notional across the account and divide by equity, and you have your account-level exposure:

account exposure = total notional ÷ account equity

That ratio is what leverage means at the account level, and it is the one that tells you what a market-wide move does to you.

Two refinements people skip:

Gross vs net. A 16,000 long in one asset and a 10,000 short in another is 26,000 gross and 6,000 net. The net figure only means something if the two assets move together reliably. When they do not, gross is the honest number — see correlation and position limits.
Current vs entry. Exposure is recomputed on current notional and current equity, and it drifts against you. An illustrative account of 10,000 with a 20,000 short is at 2×; after a 20% rise the short is 24,000 of notional on 6,000 of equity — 4×, without a new order. A long at 2× after a 20% fall is 16,000 on 6,000, or 2.67×. Losses raise exposure.

Where the boundary should sit

Size, cap and cost everything in notional; treat margin as a consequence. Concretely:

Convert before comparing. If a screen shows margin as “size”, multiply by leverage before you compare it with anything. Two “1,000” positions at 5× and 25× are 5,000 and 25,000.
Derive notional from the stop. Position size comes from your risk amount and stop distance; notional is risk amount ÷ stop %. The position size calculator returns it, and how to calculate position size explains the steps.
Cost trades against notional, judge results against equity. Fees and funding are computed on notional; whether the trade was worth it is a question about the account, not about the margin.
Re-read exposure as prices move. The number you opened with is not the number you hold.

FAQ

How do you calculate notional value?

For a linear contract sized in the base asset, multiply quantity by price: 0.25 units at 64,000 is 16,000. For contracts with a multiplier, multiply contracts by the multiplier by the price. For inverse contracts, notional is the number of contracts times their fixed USD face value, which is a varying amount of the coin as price moves.

Is notional value the same as margin?

No. Notional is the full value of the position; margin is the collateral posted to hold it, equal to notional divided by leverage. A 16,000 position at 10× has 1,600 of margin. Price moves, fees and funding all apply to the 16,000, which is why the margin figure understates what you are exposed to.

Are trading fees charged on notional or on margin?

On notional, on both entry and exit. That makes a given fee rate look larger the higher your leverage when you measure it against margin: a 0.1% round trip is 1% of margin at 10× and 2% at 20×, for the same fee in currency. Funding on perpetuals is also charged on notional.

Why did my notional change when I did not trade?

Because current notional is recomputed at the venue’s reference price. A long position grows in notional as price rises and shrinks as it falls; a short does the opposite. Funding, maintenance margin tiers and account exposure all follow the current figure, so a position can move into a higher tier without any new order.