What Is Mark Price? 2026 Perpetual Futures Liquidation Calculation and Funding Rate Basis

Mark price is the fair reference price for perpetual futures, calculated as a weighted average from multiple major spot markets, not the actual traded price. It is used for PnL and liquidation decisions, reducing false liquidations caused by price spikes in a single market.

To use an analogy, mark price is like an average thermometer across multiple markets; it does not swing violently because of a brief anomaly in one market, making it more reliable than looking only at the last traded price in a single market.

#Definition and Calculation of Mark Price

Mark price is a reference price calculated by exchanges as a weighted average of prices from multiple major spot markets. It is not a real-time traded price but a smoothed fair market value. By aggregating data from multiple markets, it reduces the impact of abnormal fluctuations in a single market.

The calculation usually involves two steps: first, take a weighted average price from major spot markets such as Binance and OKX; then adjust it by adding the funding rate basis (or premium index). The funding rate basis reflects the deviation between the perpetual futures price and the spot price, and its specific implementation may vary by platform.

The update frequency is usually high, often at the second or multi-second level, to prevent intense short-term fluctuations from having an outsized impact on accounts. The exact frequency varies by platform.

#What Is the Difference Between Mark Price and Last Traded Price?

The last traded price is the price of the most recent transaction, which can be momentarily distorted by large orders or insufficient liquidity. Mark price, on the other hand, is a smoothed reference price that reduces transient fluctuations and is used for risk control and liquidation decisions. When the two diverge significantly, the perpetual futures funding rate settlement schedule encourages arbitrageurs to pull the price back.

The following table summarizes the core differences between mark price and last traded price in 2026:

Item	Mark Price	Last Traded Price
Definition	Weighted average reference price across multiple markets	Last actual traded price
Volatility	Smooth and stable, filtering transient noise	May be momentarily distorted by large orders
Use	Calculate PnL and determine liquidation	Display real-time trades and trigger market orders
Manipulation difficulty	More difficult, requires simultaneous manipulation across multiple markets	Easier, a large order in a single market can influence it

To learn more about the differences in mechanisms between spot and perpetual futures, read the comparison of spot and perpetual futures.

#How Does Mark Price Affect Funding Rate and Liquidation?

Funding rate is a periodic payment in perpetual futures that incentivizes the contract price to converge toward the spot price. Its calculation typically involves the premium/discount between the perpetual futures price and the spot index price. Mark price may serve as one reference for calculating the premium index, but not all platforms directly use the difference between mark price and spot price as the basis. For details on the funding rate mechanism, see funding rate.

Liquidation is typically triggered based on mark price rather than last traded price, which helps avoid erroneous liquidations caused by price spikes in a single market. However, in extreme market conditions, mark price itself can fluctuate rapidly and lead to liquidation.

#What Should Beginners Watch Out For When Using Mark Price?

• Do not judge profit or loss based solely on the last traded price; mark price is a reference price, not an actual executable price.
• Mark price aggregates data from multiple markets and is harder to manipulate by a single market, but it can still briefly deviate under extremely poor liquidity or extreme conditions.
• If you notice a persistent and significant deviation between mark price and spot price, carefully assess the risk and consider reducing leverage or position size.
• Develop the habit of looking at mark price rather than last