Sizing a Futures Position From Its Liquidation Distance

Leverage is easy to set and hard to feel. On a perpetual futures contract, the number that actually decides whether you stay in the trade is the distance between your entry price and your liquidation price. That distance is not a fixed property of the market; it is a product of your margin mode, your leverage, your added margin and the maintenance margin requirement attached to the position. Because those inputs are yours to choose, position size is a decision you make, not a number the platform hands you. This guide describes a plain, repeatable way to size a position from the liquidation distance you are willing to accept. The approach is mechanical: decide the distance first, then solve for size, then write down what you verified. You will need the official futures documentation for contract specifications and margin behaviour, the fee page for the cost of opening and closing, and your account settings for margin mode. Treat every figure you see in the interface as something to confirm rather than assume, because specifications can change and your own account configuration may differ from a default. Nothing here is a recommendation to trade, and no method removes the possibility of loss. The goal is narrower and more useful: to stop choosing size by habit and start choosing it from the distance you can actually tolerate.

Why liquidation distance is the right starting point

Most traders pick a position size first and discover their liquidation price afterwards. That order hides the real risk. When you set leverage, you are effectively choosing how close liquidation sits to your entry. A high leverage setting does not increase the probability of a correct call; it shortens the runway the price has before the position is closed. If your reason for entering the trade needs room to develop, a liquidation price inside that room makes the trade structurally fragile regardless of how good the idea is.

Working backwards fixes the ordering. You decide, in price terms, how far the market may move against you before you are willing to be out. That distance is a judgement about the trade, not about the platform. Once it is fixed, leverage and size become derived numbers rather than guesses. Two traders with the same view can hold very different sizes simply because they chose different distances, and neither is wrong; they are expressing different tolerances.

The distance you pick should reflect volatility you have actually observed, not a round number that feels comfortable. If the instrument routinely moves several percent within a session, a liquidation distance tighter than that is likely to be touched by ordinary noise rather than by a genuine change in the thesis. Use the official futures documentation to confirm how the contract is quoted and what the tick and contract size are, so your price distance converts correctly into a position size.

Reading the inputs that set your liquidation price

Liquidation price is determined by entry price, position size, leverage, margin mode and the maintenance margin requirement for that contract and tier. In isolated margin, the margin assigned to the position is the most the position can lose, and adding or removing margin moves the liquidation price directly. In cross margin, the whole available balance backs the position, so liquidation depends on account-level equity rather than a single isolated amount. Confirm which mode your account is actually in before you calculate anything, because the same size produces different liquidation distances in the two modes.

Leverage is the input most people reach for first, but it is only one lever. Reducing leverage widens the distance; adding margin to an existing isolated position widens it too. Increasing size narrows it. That means you can keep a leverage setting you like and still adjust the distance by changing size or margin. The interface may show an estimated liquidation price that updates as you edit the order, and that estimate is useful as a cross-check, but treat it as something to verify against the official documentation rather than as a guarantee of the exact level at which the engine will act.

Maintenance margin is not a single flat figure across all positions. It can vary by contract and by position tier, and it can be adjusted by the platform under stressed conditions. The official futures documentation is the place to check how maintenance margin and tiers are described for the contract you intend to trade. Record what you find, along with the date, so that a later change is visible to you instead of silent.

A step-by-step method to convert distance into size

Start by writing the entry price and the liquidation price you are willing to accept, then take the difference as a percentage of entry. That percentage is your buffer. Next, decide the maximum loss you are prepared to take on this trade if the buffer is fully used, expressed as a share of your account, not as a currency figure you have not yet checked. Then size the position so that the buffer multiplied by the position notional matches that maximum loss, and adjust leverage or added margin until the estimated liquidation price shown in the order form sits at or beyond the distance you wrote down. If the estimate lands closer than your buffer, reduce size or add margin; do not simply accept it.

After the order is placed, the estimate can drift as funding is applied and as the mark price moves. Re-check the liquidation price in the position panel rather than trusting the pre-trade estimate. If the position is in isolated mode and the distance has narrowed beyond your plan, the corrective actions are adding margin or reducing size, not raising the buffer after the fact. A buffer that is renegotiated while the trade is live is not a buffer.

Costs belong in the calculation because they consume margin. The official fee page describes how trading fees are charged on this exchange, and funding payments on perpetual contracts settle periodically. Check both pages, note the structure, and leave room in your margin so that fees and funding do not quietly push the liquidation price toward your entry. You do not need to predict the exact amounts; you need to know they exist and to size with that in mind.

What to record and when to stop

Keep a short log for each futures position: contract, margin mode, entry, size, leverage, added margin, the liquidation price you accepted, the liquidation price actually shown after opening, and the date you checked the official documentation. This log does two things. It makes your sizing consistent across trades, and it gives you evidence when a specification or fee structure appears to have changed. If a number in the log no longer matches what the interface or the help centre shows, stop and re-verify before adding to the position.

Define stop conditions in advance. A position should be closed or reduced when the mark price approaches the buffer you set, when the reason for the trade no longer holds, or when you cannot confirm the current margin requirements for the contract. If the interface shows a liquidation price you cannot explain from your own inputs, treat that as a reason to reduce exposure rather than to average down. Unexplained numbers are a signal to pause, not to increase size.

Common mistakes are worth naming. Setting leverage first and sizing afterwards inverts the whole method. Forgetting that cross margin exposes the wider balance leads to surprises when one position moves. Ignoring funding and fees leaves less margin than planned. Assuming the pre-trade liquidation estimate is final, or that a maintenance margin tier seen once will always apply, creates a false sense of precision. Finally, widening the buffer mid-trade to avoid admitting the original distance was wrong defeats the purpose of having chosen it. Use the help centre when a behaviour is unclear, and prefer the official documentation over any summary, including this one.

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Scenario checkpoint

• Write down entry price, intended liquidation price and the percentage buffer between them before choosing any size.
• Confirm whether the position will use isolated or cross margin, because the same size behaves differently in each mode.
• Check the official futures documentation for contract specifications, maintenance margin and tier descriptions, and note the date you checked.
• Review the fee page and funding structure so costs are included in the margin you set aside.
• After opening, compare the liquidation price shown in the position panel with the one you planned, and log both.
• Set stop conditions in advance: reduce or close when price approaches the buffer, when the thesis breaks, or when margin requirements cannot be confirmed.