Leverage changes margin. Position size changes exposure.

The most expensive confusion in perpetual futures is treating leverage as the risk dial. It is the collateral dial. The risk dial is size and stop — and the table below holds one position still while leverage sweeps, so the difference is visible instead of argued.

Margin

What leverage changes. Collateral the venue reserves — notional ÷ leverage, before venue tiers.

Notional

What size changes. The value actually exposed to the market: entry × quantity.

Planned loss

What size and stop change together. |entry − stop| × quantity, plus costs — the number your risk rule is about.

If two of the three move when you adjust something, you adjusted size. If only margin moved, you adjusted leverage. The trade's risk lives in the first case.

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The free check runs your own numbers: planned loss, exposure, estimated margin, and the size your rule allows.

What this covers

Linear USDT/USDC perpetuals; margin approximated as notional ÷ leverage.

Isolated versus cross margin is defined below as context. Neither liquidation price is calculated here — that requires venue maintenance-margin rules this page does not model.

Lower leverage alone does not make a trade safe: the planned loss column is identical at every leverage.

Formula and assumptions

Gross notional = entry × quantity — what the position is exposed to.

Estimated margin = notional ÷ leverage — what the venue sets aside.

Planned loss = |entry − stop| × quantity — what the stop is designed to cost.

Isolated margin: only the position's own margin backs it. Cross margin: the whole account backs every position — a definition, not a calculation.

Worked example

One position, four leverages — 0.1 BTC, entry 60,000, stop 58,800.

2× leveragemargin $3,000 · notional $6,000 · planned loss $120

5× leveragemargin $1,200 · notional $6,000 · planned loss $120

10× leveragemargin $600 · notional $6,000 · planned loss $120

20× leveragemargin $300 · notional $6,000 · planned loss $120

Common mistakes

Choosing leverage first and letting margin capacity choose the size.

Reading 20× as twenty times the risk of 1× at the same size — the loss column above says otherwise.

Reading 20× as safe because the margin is small — the notional column says otherwise.

Expecting a liquidation price from arithmetic this simple. Venue tiers, fees and mode decide it.

Limitations

This is arithmetic on numbers you supplied. It does not know your broker, your account, or the market. It does not predict price, does not say whether to take a trade, and is not advice. Maximelion is not affiliated with any broker or prop firm, and nothing here is endorsed by one.

Leverage risk calculator Stop-loss risk Position size Perpetual Desk

Last reviewed 31 July 2026