When futures positions share collateral, calculate risk for the venue-defined margin pool—not as if each position had a separate wallet. Work out which balances and profit-and-loss the exchange counts, total the pool’s maintenance requirements and applicable fees, then compare the two using that exchange’s own risk measure. The result is an estimate under the venue’s rules, not a guaranteed liquidation price.
Start by identifying what actually shares collateral
“Cross margin” does not necessarily mean every position and asset in an account belongs to one pool. The exchange may group risk by settlement currency, product, account mode, or another rule. A loss in one eligible position can reduce the equity protecting other positions in the same pool; a profit elsewhere may offset that loss only if the venue recognizes it for this calculation.
Before calculating, record the exchange, futures product, cross or isolated setting, hedge or one-way mode, settlement asset, and collateral assets. Confirm the account’s actual grouping in the applicable rules. For example, OKX’s cited single-currency futures cross-margin guide says positions settled in the same crypto share total margin and can offset PnL; that statement does not establish how every OKX account mode or other venue handles collateral.
Gather the inputs for every eligible position and order
Use live account and contract data rather than a remembered flat maintenance rate. For each position, collect:
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- Contract type, settlement asset, direction, quantity or contract count, multiplier, and face value.
- Mark Price, average entry price, and unrealized PnL as shown or calculated under that venue’s rules.
- Eligible account balance and collateral value after any venue-applied valuation rules.
- The current maintenance-margin tier, applicable liquidation-fee schedule, and any order-related margin or loss requirement.
- Venue-counted liabilities, accrued interest, funding, or other deductions.
Also include open orders if the venue includes their margin, order loss, or fees in the pool calculation. OKX’s rules give different initial-margin calculations for crypto-margined and USDT-margined contracts and say cross-margin initial margin varies with Mark Price, so contract denomination and current price matter.
Calculate pool equity and aggregate requirements
1. Establish eligible equity
Use the exchange’s definition of equity, not simply the displayed wallet balance. As a conceptual ledger—not a universal exchange formula—you can organize the inputs as:
Eligible pool equity = eligible collateral value + eligible realized PnL + eligible unrealized PnL − venue-defined liabilities and deductions.
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Only include assets and PnL that the venue says count for that pool and purpose. Binance’s liquidation explanation describes collateral in its trigger as initial collateral plus realized PnL plus unrealized PnL. OKX’s single-currency cross-margin guide defines equity using trading-account balance, cross-margin PnL, and other listed components; its free-margin calculation also subtracts amounts in use. Those definitions are venue-specific.
2. Add maintenance margin, fees, and relevant order costs
Calculate each eligible position’s maintenance margin using its contract specification, current size, and applicable risk tier. Then aggregate the requirements for the pool, adding liquidation fees and order-related requirements where the exchange’s rules include them. Do not assume open orders are irrelevant: OKX’s cited rules include open-order maintenance margin and liquidation fees in its cross-margin calculations.
3. Compare equity with the venue’s liquidation measure
A useful conceptual check is equity relative to aggregate maintenance margin and liquidation fees. More eligible equity relative to the requirement generally means more room before the pool reaches its trigger; a shrinking margin of headroom signals rising risk. You can also track conceptual headroom as eligible equity minus aggregate maintenance requirements and applicable fees. These aids do not replace the exchange’s actual formula: venues may use different deductions, order treatment, labels, or ratio directions.
For instance, OKX calls its cross-margin measure a maintenance-margin ratio and presents equity-side terms over maintenance margin plus liquidation fees. Binance describes liquidation when collateral falls below maintenance margin and identifies a 100% margin-ratio trigger. Those are platform-specific definitions, not a common industry formula or target.
Stress-test the shared pool, not one liquidation price
Recalculate the pool using scenarios that change the Mark Price of each position and, when relevant, the value of collateral assets. A practical worksheet should include:
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- A loss on one position while the other positions remain unchanged.
- Simultaneous losses on correlated positions.
- A decline in the value of crypto collateral, if the pool uses it.
- Open orders that could add exposure or reserve margin.
- Any venue-specific rule limiting which unrealized profits or collateral values count.
For each scenario, record the revised eligible equity, aggregate maintenance requirement and fees, and the exchange-defined ratio or trigger status. Equity and requirements can both change as exposure and prices change. Do not assume that one dollar of displayed unrealized profit or collateral value contributes one dollar of usable margin unless the venue’s rules say so.
Why a position’s displayed liquidation price can move
In a shared pool, a displayed liquidation price for one position can change when another eligible position’s PnL changes. Bybit’s help-center search excerpt describes multiple USDT positions using cross-margin collateral: as the losing position’s unrealized loss grows, the profitable position’s liquidation price moves closer to Mark Price. The excerpt provides a simplified long/short formula but notes that closing fees create a small difference from actual liquidation price. Because the directly available page content is limited, treat that formula as Bybit-specific and verify the current rule for the account before relying on it.
Some account combinations may not have a meaningful individual estimated liquidation price. OKX says its estimate may be unavailable for certain mixed-underlying or mixed-product cross-margin combinations. Its cited guide describes account-level risk management: if the maintenance-margin ratio remains at or below the specified threshold after order cancellation, the platform may partially liquidate positions in stages, using its stated business-line and liquidity ranking.
Use Mark Price and understand execution uncertainty
Use the price basis specified by the venue’s liquidation rules. Binance says liquidation prices and unrealized PnL are calculated using Mark Price, rather than Last Price. In a volatile market, Mark Price can move past an earlier displayed liquidation estimate before an order executes, so the eventual execution price may differ from the estimate. A screen price is therefore a snapshot under current assumptions, not a guaranteed exit price.
How the cited venue examples differ
The following examples come from specific help-center pages and account descriptions; they are not universal rules. OKX’s cited pages use Singapore and UK help-center paths, and Binance’s cited page uses a Nigeria path. Confirm the current rules for the product, account, and region in use.
| Venue documentation | Collateral grouping or price basis | Trigger or liquidation handling | Important qualification |
|---|---|---|---|
| OKX, “Futures margin calculation rules” and “Futures mode: cross margin trading” | The cited single-currency guide groups positions settled in the same crypto; it also describes PnL offsetting within that group. The liquidation estimate may be unavailable for certain mixed-underlying or mixed-product combinations. | The cited single-currency guide describes a 100% maintenance-margin-ratio trigger for its specified cross-margin conditions and a 300% pre-alert parameter. | The 300% pre-alert may be adjusted. The guide describes staged, account-level liquidation after order cancellation where its stated conditions apply; the cited settings are not universal across OKX products or modes. |
| Binance, “Binance Futures Liquidation Protocols” | The cited page uses Mark Price for liquidation prices and unrealized PnL and discusses shared cross-margin liquidation prices, including hedge mode. | The page describes liquidation when collateral falls below maintenance margin and a 100% margin-ratio trigger. It also recommends an 80% margin ratio as a Binance-specific recommendation. | The cited help-center path is Nigeria-specific, and its inspected publication date was not displayed. Confirm the current rule for the relevant account and instrument. |
| Bybit, “Liquidation Price (USDT Contract)” search excerpt | The excerpt discusses multiple positions using the same USDT asset as cross-margin collateral. | Not stated in the cited excerpt (Bybit help-center search excerpt). | The excerpt offers a simplified long/short formula and notes a closing-fee difference, but direct page content was limited; verify current rules before using its formula. |
Common calculation errors to avoid
- Applying an isolated-position liquidation formula to positions that use a shared pool.
- Counting every account asset or all unrealized profits without checking whether they are eligible for that venue’s calculation.
- Using Last Price when the venue’s liquidation trigger uses Mark Price.
- Leaving out risk tiers, contract multipliers, order requirements, liquidation fees, or collateral valuation rules.
- Treating a displayed liquidation estimate as a guaranteed execution price.
- Applying a threshold or formula from one venue to another.
Cross margin gives eligible positions access to shared equity, but it also exposes that equity to losses across the eligible pool. A wider pool is not automatically lower risk.
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