The Math of Perpetual Futures Liquidation

What liquidation is and how it works

Liquidation is the automatic closure of a leveraged position when the losses exceed the trader's available margin.

In a perpetual futures position, you deposit margin — a fraction of the total position value — to control a larger position. When the position moves against you, the losses are deducted from that margin. When the margin falls below the exchange's maintenance margin requirement, the position is liquidated.

The exchange doesn't ask permission. It doesn't warn you it's about to happen (though most platforms display an estimated liquidation price in the interface). It closes the position automatically and takes whatever margin remains to cover the loss.

The result: you lose the margin you deposited for that position.

Liquidation thresholds at every leverage level

The percentage move required to trigger liquidation is approximately the inverse of your leverage:

• ·1x leverage → 100% adverse move to liquidate (not leveraged)
• ·2x leverage → 50% adverse move to liquidate
• ·3x leverage → 33% adverse move to liquidate
• ·5x leverage → 20% adverse move to liquidate
• ·10x leverage → 10% adverse move to liquidate
• ·20x leverage → 5% adverse move to liquidate
• ·50x leverage → 2% adverse move to liquidate
• ·100x leverage → 1% adverse move to liquidate

Note: exact liquidation thresholds vary by exchange based on maintenance margin requirements. The figures above are approximations. Check your specific exchange for exact liquidation prices.

How to calculate max safe leverage → Perpetual Futures Leverage Guide

Isolated vs cross margin — which protects your account → Isolated vs Cross Margin Guide

How open interest signals liquidation risk → Perpetual Futures Open Interest

The position sizing formula that protects your account

The critical insight most new perp traders miss: leverage and position size are two separate decisions.

You can run 10x leverage and still protect your account — if your position size is small enough relative to your total capital.

The formula:

Example:

• ·Account balance: $10,000
• ·Maximum risk per trade: 2% ($200)
• ·Stop loss distance from entry: 5%
• ·Maximum position size: $200 ÷ 5% = $4,000
• ·At 5x leverage, the required margin is $800

In this example, the worst case on a single trade is a $200 loss — 2% of the account. The account survives. Every time.

Common liquidation mistakes

The four mistakes that cause most liquidations among new perp traders:

1. 1.Using too much leverage without understanding the liquidation threshold. The most common mistake. Traders select 20x or 50x leverage without calculating that a 5% or 2% adverse move triggers liquidation.
2. 2.Using cross margin without understanding the implications. Cross margin uses your entire account balance to support all open positions. One bad trade can draw from other positions' margin, triggering cascading liquidations across the entire account.
3. 3.Not setting a stop loss. Without a stop loss, a position is held until liquidation. The loss is always larger than it would have been with a defined exit.
4. 4.Averaging into a losing position. Adding to a position that's moving against you lowers the average entry but also lowers the liquidation threshold. This compounds the loss rather than managing it.

How to calculate your liquidation price

Most exchanges display an estimated liquidation price in the position management interface. Before entering any position, verify:

1. 1.What is my entry price?
2. 2.What is my leverage?
3. 3.What is my liquidation price (displayed by the exchange)?
4. 4.What is the distance between my entry and liquidation in percentage terms?
5. 5.How does that compare to typical daily volatility for this asset?

If the distance to liquidation is smaller than a typical daily move in the asset — reconsider the leverage.

The account survival framework

The traders who survive perpetual futures long-term follow a simple framework before every trade:

1. 1.Know the liquidation price before entering
2. 2.Set a stop loss before the liquidation price
3. 3.Size the position so the stop loss loss is a defined, acceptable percentage of capital
4. 4.Never add to a losing position
5. 5.Never remove a stop loss once set

In this order. Every time. No exceptions.

The account you protect today is the one you trade with tomorrow.

How to set a stop loss before liquidation becomes relevant →

Learn how Vault Protocol uses position sizing → chartsmeancash.com/performance

Understanding leverage and funding → How Perpetual Futures Funding Rates Work

New to perps? Start here → What Are Perpetual Futures?