# Leverage, margin, and position size in crypto perpetuals

> How leverage, margin, notional value, and position size relate in perpetual futures, with worked examples for sizing a trade with a liquidation buffer.

- Canonical page: https://lynx.finance/blog/leverage-margin-position-size/
- Published: 2026-07-31
- Updated: 2026-07-31
- Author: Lynx
- Category: Learn
- Reading time: 4 min
- Keywords: trade crypto with leverage, notional value vs margin, how much margin for 10x leverage, perpetual futures trading

`$100` at `20×` creates roughly `$2,000` of market exposure before venue fees and adjustments. The margin is `$100`; the position size is about `$2,000`; the leverage is the ratio between them.

That relationship is the foundation of leveraged trading. Risk comes from the exposure, the market move, the exit, and the venue's rules—not from the leverage label alone.

## Three numbers, one relationship

**Position size**, or notional value, is the full market exposure. A position in `0.1 BTC` at `$50,000` has `$5,000` of notional exposure.

**Margin** is the eligible [collateral](https://lynx.finance/glossary/collateral/) assigned to support that exposure. It absorbs losses and fees under the venue's risk model.

**Leverage** is position size divided by margin. `$5,000` of exposure supported by `$1,000` of margin is `5×` leverage.

Fix any two values and the third follows. The [position size and notional value](https://lynx.finance/glossary/position-size-and-notional-value/) entry gives more examples.

## Notional vs margin: which one is "your trade"?

Notional determines directional exposure. A `1%` move on `$2,000` of notional changes gross [unrealized PnL](https://lynx.finance/glossary/realized-and-unrealized-pnl/) by about `$20` before fees and other adjustments.

Margin determines how much equity supports that move. Losing `$20` consumes `20%` of `$100` margin but only `2%` of `$1,000` margin.

Fees, funding, borrow charges, and [price impact](https://lynx.finance/glossary/slippage-and-price-impact/) vary by venue. Some use notional; others apply charges to a different base. Read the venue's formula instead of assuming one universal stack.

## How much margin do you need for 10× leverage?

In a simple model, initial margin equals notional divided by leverage. `$10,000` of exposure at `10×` uses `$1,000` of margin; at `5×`, it uses `$2,000`.

That is only the opening arithmetic. A venue may deduct an opening fee first, apply margin tiers, or calculate position size from post-fee collateral.

The table below isolates the directional effect of a market move. It excludes trading fees, funding, borrow charges, price impact, and liquidation rules.

| Leverage on `$5,000` notional | Simplified margin | Move causing `$250` gross loss | Gross loss as % of margin |
| ----------------------------- | ----------------- | ------------------------------ | ------------------------- |
| `2×`                          | `$2,500`          | `5%`                           | `10%`                     |
| `5×`                          | `$1,000`          | `5%`                           | `25%`                     |
| `10×`                         | `$500`            | `5%`                           | `50%`                     |
| `20×`                         | `$250`            | `5%`                           | `100%`                    |

The same market move creates the same gross loss at every row because notional is fixed. Higher leverage means less margin is available to absorb it.

Liquidation may occur before margin reaches zero. The actual threshold comes from the venue's [initial and maintenance margin](https://lynx.finance/glossary/initial-and-maintenance-margin/) or other risk model.

## Sizing from risk, not from the slider

One sizing method starts with an acceptable loss and an invalidation point. If the acceptable gross loss is `$150` and the planned exit is `3%` from entry, the simplified notional is `$150 / 3% = $5,000`.

Next choose enough margin to keep the venue's liquidation condition beyond the planned exit. Then calculate the resulting leverage.

This method is incomplete without slippage. A stop is an instruction to exit, not a guaranteed price. Fast markets, thin liquidity, or network delays can produce a larger loss than the calculation assumes.

## Why equal leverage is not equal risk

Equal leverage does not mean equal risk. Volatility, liquidity, holding time, fees, funding, margin mode, and liquidation rules all change the result.

Collateral treatment also differs. Some venues revalue volatile collateral against the settlement asset. Others isolate the accounting from the collateral token's external price.

The [crypto liquidation guide](https://lynx.finance/blog/crypto-liquidation/) explains how those venue rules affect the close.

## How position sizing works on Lynx

Lynx calculates position size from collateral after the opening fee is deducted. The [Lynx fee documentation](https://lynx-finance.gitbook.io/lynx-finance/for-users/fees) gives this example:

```text
100 DAI initial collateral × 20 leverage = 2,000 DAI pre-fee size
2,000 DAI × 0.10% opening fee = 2 DAI fee
98 DAI post-fee collateral × 20 leverage = 1,960 DAI position size
```

On Lynx, the selected collateral asset determines the isolated liquidity pool and the asset used for PnL and fees.

Its external token price does not change position health, according to the [Lynx trader documentation](https://lynx-finance.gitbook.io/lynx-finance/for-users/traders).

That behavior differs from venues that continuously revalue collateral in a common quote currency. It is why a generic margin calculator should not be treated as a Lynx liquidation calculator.

For the wider system, read the [on-chain perpetual futures guide](https://lynx.finance/blog/onchain-perpetual-futures-explained/). For compact definitions, start with [leverage](https://lynx.finance/glossary/leverage/) in the glossary.

## Sources

- [Lynx: Fees](https://lynx-finance.gitbook.io/lynx-finance/for-users/fees) — opening-fee and position-size calculations.
- [Lynx: Traders](https://lynx-finance.gitbook.io/lynx-finance/for-users/traders) — collateral, settlement, pricing, and liquidation behavior.
- [Hyperliquid: Margining](https://hyperliquid.gitbook.io/hyperliquid-docs/trading/margining) — one documented initial, maintenance, cross-margin, and isolated-margin model used for comparison.

All examples are simplified and educational. They are not financial advice. Verify current fees, risk parameters, and execution rules before trading.