What Is Notional Value?
Imagine you rent a Ferrari for the weekend using a $200 deposit. The car itself is worth $80,000. If you scratch it, the damage costs are based on the Ferrari's value — not your $200 deposit. The Ferrari is your notional value. The $200 is your margin.
In perpetual futures, the same idea applies. You put up a deposit (margin) and use leverage to control a much larger position. The notional value is the full dollar size of that position — what you actually have exposure to in the market.
Notional Value = Margin × Leverage
Understanding Notional Value
| Margin | Leverage | Notional Value |
|---|---|---|
| $100 | 5x | $500 |
| $500 | 10x | $5,000 |
| $1,000 | 20x | $20,000 |
| $2,000 | 50x | $100,000 |
You deposited $500 but you are controlling a $5,000 position. That $5,000 is the number that matters for almost everything: fees, funding, and how much you can lose.
Why Notional Value Matters More Than Margin
Most traders focus on their margin deposit and forget that fees and funding are charged on the full notional — which can be 5x, 10x, or 50x larger.
Trading Fees Are Based on Notional
Taker fees on most perp exchanges are around 0.04–0.05% per trade. That percentage applies to your notional value, not your margin.
| Margin | Leverage | Notional | Taker Fee (0.045%) | Fee as % of Margin |
|---|---|---|---|---|
| $1,000 | 2x | $2,000 | $0.90 | 0.09% |
| $1,000 | 5x | $5,000 | $2.25 | 0.225% |
| $1,000 | 10x | $10,000 | $4.50 | 0.45% |
| $1,000 | 20x | $20,000 | $9.00 | 0.90% |
| $1,000 | 50x | $50,000 | $22.50 | 2.25% |
At 50x leverage, a single trade open and close costs over 4.5% of your deposited margin in fees alone. Your trade needs to move 4.5% in your favor just to break even.
Funding Rate Is Based on Notional
Funding rate payments are also calculated on notional. If the rate is 0.01% per interval:
| Margin | Leverage | Notional | Funding per Interval (0.01%) |
|---|---|---|---|
| $1,000 | 2x | $2,000 | $0.20 |
| $1,000 | 10x | $10,000 | $1.00 |
| $1,000 | 50x | $50,000 | $5.00 |
The same 0.01% rate costs $0.20 at 2x leverage but $5.00 at 50x — 25x more, just because of leverage. Hold the 50x position for a week and that is $105 in funding from one $1,000 deposit.
Notional vs Margin: A Clear Comparison
| Margin | Notional Value | |
|---|---|---|
| What it is | Your deposit / collateral | The full position size you control |
| Fees charged on | No | Yes |
| Funding charged on | No | Yes |
| Liquidation based on | Margin ratio vs notional | Effectively both |
| Displayed by exchange? | Yes | Sometimes — check your position panel |
Using Notional Value in Position Sizing
The 1-2% risk rule says never risk more than 1-2% of your account on one trade. But what does "risk" actually mean here?
Your risk is the dollar loss if your stop-loss is hit. That loss is based on the notional value, not just the margin.
Example:
- Account: $10,000
- Risk per trade: 1% = $100
- Stop-loss distance: 2%
- Position size needed: $100 / 0.02 = $5,000 notional
- If using 5x leverage: margin required = $1,000
The notional size ($5,000) is determined by your risk and stop-loss, not by how much leverage you feel like using. Leverage just determines how much of your account you lock up as margin.
The mistake: Many traders pick a leverage level first, calculate the notional, then discover the risk is far too large. Always start with the risk and stop-loss to arrive at the correct notional — then choose leverage based on how much margin you want to allocate.
Related Terms
- Leverage — the multiplier that converts margin into notional value
- Margin — your deposit; the notional value is the larger number it controls
- Initial Margin — the minimum margin required to open a given notional size
- Maker-Taker — trading fees that are charged on notional, not margin
- Funding Rate — ongoing cost also charged on notional value