Binance mark price explained: PnL, liquidation and trigger orders

Binance mark price is a reference price used by Binance Futures to evaluate a contract more fairly than one isolated trade. It is especially important for unrealized PnL, margin risk and liquidation monitoring. It is not necessarily the price at which your position can be closed.

The practical rule is simple: last price describes the most recent execution; mark price is a risk reference. They often stay close, but they are allowed to differ.

Mark price vs last price vs index price

Price	What it represents	Common use	What it does not guarantee
Mark price	Fair-value reference derived from index and basis-related inputs	Unrealized PnL and liquidation-risk checks	Your next execution price
Last price	Most recent matched trade in the futures market	Recent execution context and some triggers	A stable fair value
Index price	Composite reference based on selected spot markets	Important input to mark price	A directly tradable futures price
Liquidation price	Estimated risk threshold based on the position and margin state	Distance-to-liquidation monitoring	A stop-loss fill or exact forced-close price

Do not compare only last price with liquidation price. Check which price the interface uses for the liquidation and PnL calculation, then compare the current mark price with the estimated liquidation level.

How Binance mark price is formed

At a high level, the mechanism starts with an index price built from underlying spot-market data and applies a basis-related adjustment for the futures contract. The exact formula, caps and inputs can vary by product and may be updated.

This design reduces the chance that one unusual futures trade immediately distorts risk calculations. It does not make mark price fixed or immune to market movement. When the underlying market or contract basis changes, mark price changes too.

For the current calculation and product-specific rules, use the live contract information and Binance’s own Mark Price and Price Index documentation.

How mark price affects unrealized PnL

Suppose a trader opens a long perpetual-futures position at 100. The interface shows:

• last price: 100.0;
• mark price: 99.2;
• estimated liquidation price: 98.8.

The most recent trade may still be near the entry, but a PnL or liquidation-risk view based on the 99.2 mark price can already show meaningful pressure. The distance from mark price to the estimated liquidation level is only 0.4.

This simplified example explains the price relationship, not a complete PnL formula. Position direction, quantity, contract type, fees, funding and account margin also affect the result. Read the Binance funding rate guide to separate holding cost from price movement.

Does Binance liquidate at mark price?

Liquidation monitoring generally relies on mark price and the account’s margin conditions, not on one isolated last-price print. However, liquidation is a process rather than a promise to fill exactly at the estimated liquidation price.

The displayed liquidation level can change when you:

• add or remove margin;
• change position size;
• change leverage settings;
• hold positions that affect account-level margin;
• pay fees or funding;
• switch between isolated and cross margin.

Use the current margin ratio, mark price and product rules together. For a full checklist, continue to how Binance liquidation price works.

Mark Price or Last Price for a trigger order

Some Binance Futures conditional orders let you select a trigger source. That setting controls when the order is activated; it does not guarantee the eventual fill.

Trigger source	Better aligned with	Main trade-off
Mark Price	Liquidation-risk reference and fair-value movement	May not trigger when only the latest trade touches your level
Last Price	Actual recent futures trades	A short order-book move may trigger sooner

After activation, a market order can experience slippage and a limit order may remain unfilled. Confirm both the trigger source and the order type. The Binance TP/SL guide explains this distinction in context.

Mark price and leverage

Increasing leverage does not change mark price itself. It changes how much initial margin supports a position and can reduce the adverse move the position can absorb before liquidation risk becomes severe.

That is why a trader should not ask only whether mark price is near entry. A safer review combines:

1. position notional and direction;
2. isolated or cross margin mode;
3. available and maintenance margin;
4. mark price to liquidation-price distance;
5. stop-loss trigger source and expected execution risk;
6. fees and funding over the planned holding period.

Common Binance mark price mistakes

• Treating mark price as a guaranteed market-order fill.
• Watching last price while ignoring the mark-price distance to liquidation.
• Assuming index price, mark price and liquidation price are the same number.
• Forgetting to check whether a stop uses Mark Price or Last Price.
• Believing that higher leverage changes mark price rather than margin risk.
• Using liquidation as a substitute for a planned stop loss.
• Reviewing gross PnL without fees and funding.

Six checks before opening a futures position

1. Identify mark price, last price and index price on the contract page.
2. Confirm which price is used for the displayed unrealized PnL.
3. Compare mark price with the estimated liquidation level.
4. Check margin mode, leverage, position size and maximum planned loss.
5. Verify the trigger source and post-trigger order type for TP/SL.
6. Use the live Binance contract page and risk warnings as the final reference.

Facts reviewed on 2026-08-11. Futures involve substantial risk; this page explains terminology and does not predict price direction.