Leverage and Risk Management: Position Sizing and Stop-Losses

Leverage lets you control a position larger than your own money. It multiplies gains and losses by the same factor, and the usual way it goes wrong is that a small adverse move wipes out the margin. This guide covers the arithmetic and the habits that limit the damage. It does not make leveraged trading safe: most of the risk cannot be removed.

How leverage and liquidation work

With leverage you post margin, a fraction of the position's value, and the exchange lends the rest. If the price moves against you far enough that your margin can no longer cover the loss, the exchange closes the position. That is liquidation, and the margin is lost.

As a rule of thumb, the adverse move that liquidates you is roughly one divided by the leverage, before fees and maintenance margin:

• At 2x, a drop of about half the position's value.
• At 10x, a move of about 10% against you.
• At 20x, about 5%.

The actual liquidation price depends on the exchange, the contract, fees and the margin mode, so use the exchange's own calculator. Crypto prices can move several percent within hours, so high leverage leaves very little room.

Size the position from the loss you accept

The most useful habit is to decide how much you are willing to lose on a trade, and let that determine the position size, not the other way round.

A hypothetical example: your account is 10,000 and you accept losing 1% of it on one trade, so 100. You plan to place the stop-loss 2% away from your entry. The position size is the amount you risk divided by the stop distance: 100 divided by 0.02 is 5,000. If the stop is hit you lose about 100, whatever leverage you used to open the position. Leverage only decides how much margin that position ties up. How much to risk per trade is a personal decision; the point is to choose it before you open the trade.

Stop-losses

• A hard stop-loss is an order on the exchange. It closes the position if the price reaches your level. A mental stop-loss is not an order, and in a crash it is easy to ignore.
• Stops are not guarantees. In a fast market the fill can be worse than your stop price, and in extreme conditions it can be much worse.
• Place the stop where your trade idea is wrong, not just at a convenient round number, then size the position to fit it.
• Do not widen a stop to avoid being stopped out. That turns a planned loss into an unplanned one.

Isolated versus cross margin

• Isolated margin assigns a fixed amount of collateral to one position. If it is liquidated, you lose that amount and the rest of your futures balance is untouched.
• Cross margin lets every position draw on your whole futures balance to stay open. The position survives larger moves, but when it fails, the entire balance can go with it.

Beginners usually start with isolated margin so that one mistake cannot reach the whole account.

Fees and funding add to the cost

Futures fees are charged on the full position size, not on your margin, so they are large relative to your own capital, and perpetual contracts also charge or pay funding at regular intervals. See the futures trading guide for a worked example and compare rates in the exchange fee comparison.

Crashes

Liquidations tend to cluster in sharp moves, which can push prices further and trigger more liquidations. Leverage that looked reasonable on a quiet day can be fatal in a crash. Lower leverage and a smaller position are the main protection.

A checklist before you open a leveraged position

1. Do I know the liquidation price, and is it far enough from my entry?
2. Have I decided where I am wrong, and sized the position so that loss is acceptable?
3. Is the stop an order, not a plan in my head?
4. Am I using isolated margin?
5. Can I afford to lose the whole margin?
6. Do I know the fees and funding I will pay?

If any answer is no, do not open the trade. If you are new, practise with a very small position or without leverage first. You can also compare strategies that do not use leverage, such as grid bots on spot or copy trading, which carry their own risks.

Nothing here is financial advice, and leveraged trading can lose more than you expect.