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To size a crypto derivatives position, first choose the maximum amount you can lose if your trade thesis fails, then divide that risk budget by the loss per unit between your entry and invalidation price. Do not choose quantity from leverage alone. Liquidation risk is a separate check: estimate where the venue may close the position under the exact contract, margin mode, maintenance tier, mark price, fees, and account conditions.
The position-size arithmetic below works for a simple linear contract. It is not a universal liquidation formula. Binance and Bybit publish rules that vary by product and margin mode, so use the relevant venue’s current contract specifications and calculator to verify any liquidation estimate.
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What is the difference between position risk and liquidation risk?
Position risk is the planned loss if the market reaches the price where your trade idea is invalidated. Liquidation risk is the chance that the venue closes your position because the collateral available to it no longer meets the contract’s maintenance-margin requirement. These are related, but they are not the same calculation.
A stop level helps define the planned loss; it does not guarantee that the position will remain open until that level. If liquidation is closer to entry than the intended stop, the venue may close the position first. Even when the stop is farther away from entry than liquidation, execution can differ from the stop price in fast or illiquid markets, and fees and slippage can make the realized loss larger than the arithmetic estimate.
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Leverage changes the margin required to hold a given notional position and can affect liquidation distance. It does not determine how much you should be willing to lose on the trade. Begin with a loss limit you choose independently of leverage, calculate quantity from that limit, then check margin and liquidation separately.
How do you calculate position size from a planned loss?
For a simple linear contract, divide the trade’s risk budget by the loss per unit from entry to the invalidation price. Use the contract multiplier and account for fees, slippage, and any other costs that are not already included in your risk budget.
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- Set a maximum planned loss. Express the amount in the account currency you use to measure risk. It should be an amount you are prepared to lose, not a number derived from the leverage setting.
- Choose an invalidation price. This is the price at which the trade thesis no longer holds; traders often use a stop level to represent it. For a long position, it is generally below entry; for a short, generally above. The calculation uses the absolute distance between entry and invalidation.
- Calculate the price move per unit. For a linear contract, a basic estimate is
loss per unit = |entry price − invalidation price| × contract multiplier. Confirm what one contract or unit represents in the venue’s contract specifications. - Calculate quantity. Use
quantity ≈ risk budget ÷ loss per unit. If you have not included expected trading costs in the risk budget, reduce the quantity to leave room for them. - Estimate notional exposure. For a linear contract, estimate
notional ≈ quantity × entry price × contract multiplier. Notional is the market exposure represented by the position, not the amount you can lose at the stop. - Check venue-specific constraints. Compare the notional with the applicable maintenance-margin tier, contract rules, and order requirements. Then enter the exact contract and account conditions in the venue’s liquidation calculator.
The first three equations are straightforward arithmetic for a linear contract. They are not an exchange’s complete margin or liquidation formula. Inverse contracts and products with different settlement conventions require a different conversion, so do not carry the linear-contract quantity calculation over without checking the contract rules.
Can you see the calculation in a simple example?
Consider a hypothetical linear contract with a $1-per-unit multiplier. Suppose a trader enters at $50,000, places the trade’s invalidation level at $49,000, and sets a maximum planned loss of $100 before costs. The $1,000 entry-to-invalidation distance produces an estimated loss of $1,000 per unit. Dividing $100 by $1,000 gives a maximum arithmetic quantity of 0.1 units before allowing for costs. At the $50,000 entry, estimated notional is $5,000.
This example shows why quantity and leverage are different decisions: the quantity comes from the $100 risk budget and the $1,000 per-unit loss, while the $5,000 notional is checked separately against the venue’s margin rules. If expected fees and slippage are not included in the $100 budget, the usable quantity should be lower than 0.1 units. The example is illustrative arithmetic, not a venue quote, recommendation, or liquidation estimate.
For a hypothetical short entered at $50,000 with invalidation at $51,000, the absolute price distance is also $1,000. Under the same linear multiplier and $100 risk budget, the arithmetic quantity is likewise 0.1 units before costs. The direction changes the profit-and-loss path, but not the use of an absolute entry-to-invalidation distance in this simple sizing equation.
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Actual contract sizing may be denominated in contracts rather than underlying units, and a contract multiplier may differ from $1. Read the specifications for the exact contract before using an example like this. If the contract’s P&L or settlement is inverse rather than linear, this calculation is not a substitute for its own conversion rules.
How do you estimate liquidation risk after sizing?
Liquidation estimates depend on the venue’s contract formula and the account state, not just entry price and leverage. After sizing, use the venue’s calculator with the exact product, direction, margin mode, position size, mark price, fees, and account information that apply to your trade.
Binance Support describes liquidation for the relevant futures product as occurring when collateral—initial collateral plus realized and unrealized profit or loss—falls below maintenance margin. Its guide says liquidation is based on Mark Price. For a Binance USDⓈ-M cross-margin calculation, the inputs it identifies include wallet balance, maintenance margin and unrealized profit or loss from other contracts, position size, entry price, maintenance-margin rate, and the maintenance amount for the applicable tier.
Bybit publishes separate isolated-margin formulas for USDT/USDC and inverse contracts. The formulas include variables such as leverage, extra margin, maintenance-margin rate or deduction, and taker-fee rate. Bybit also notes that small differences from an actual liquidation price can result from closing fees. These are examples of why a formula from one venue or contract should not be applied to another.
A calculator output is an estimate tied to the inputs and rules it uses. It is not a guarantee that the position will close at a particular market price, nor does it tell you whether the trade’s planned loss is acceptable. Recheck the result if the position size, account collateral, active tier, fees, or other relevant inputs change.
Why can mark price differ from the price on your chart?
Mark Price and Last Price are different references. Binance distinguishes Last Price—the latest transaction price—from Mark Price, which its described futures product uses for liquidation and unrealized profit and loss. A last-trade chart can therefore show a price different from the liquidation reference used by that product.
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When checking liquidation distance, make sure you know which price the venue uses and whether the calculator is showing a mark-price-based estimate. A displayed last trade reaching a level does not, by itself, establish that a liquidation threshold was reached; conversely, a mark-price move can matter even if the latest transaction price looks different.
How do isolated and cross margin change the calculation?
Isolated and cross margin differ in which collateral can support the position, so the same trade can have a different liquidation estimate under the two modes. Use the margin mode actually selected on the account rather than treating a calculator result for one mode as valid for the other.
With isolated margin, the calculation is tied to margin assigned to that position, subject to the venue’s rules and any extra margin added. Cross margin can draw on shared account collateral and can include other positions’ effects. Binance’s USDⓈ-M cross-margin documentation, for example, includes wallet balance and maintenance margin and unrealized profit or loss from other contracts among the calculation inputs.
In the Binance setup described in its guide, isolated positions in hedge mode can have separate liquidation prices, while corresponding cross-margin hedge-mode positions share a liquidation price. That description is product- and setup-specific; confirm how the venue handles the exact account configuration rather than generalizing it to all derivatives platforms.
Cross margin can make more shared collateral available, but it also means other positions and account changes can affect the liquidation calculation. Isolated margin makes the assigned collateral more position-specific, but it does not remove the possibility of liquidation or make the risk budget irrelevant. Neither mode replaces position sizing from a planned loss.
Why do maintenance-margin tiers matter?
Maintenance-margin requirements can vary with notional exposure and the venue’s risk tier. A position that grows into a higher exposure bracket may face a different maintenance rate or tier-specific amount, changing the margin requirement and liquidation estimate.
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Binance explains that larger exposure can require more margin and lower available leverage. Its cross-margin guide says a tier mismatch requires recalculation using the appropriate tier. Bybit’s margin update says the risk tier can adjust with real-time mark price and combined position and order exposure; a tier change can raise maintenance requirements.
Do not treat a tier used when opening a trade as permanently fixed. Price movement can change notional, and open orders or other positions may count toward exposure under venue-specific rules. Recheck the active tier when exposure changes and verify the exact tier table and contract rules on the venue before relying on a liquidation estimate.
What should you check before placing or adjusting a trade?
Use this sequence to keep planned loss, margin, and liquidation from getting conflated:
- Confirm the product. Identify the exact contract and whether it is linear USDT/USDC-margined or inverse. Confirm the contract multiplier, settlement currency, and other sizing conventions in the current specifications.
- Write down the risk budget and invalidation level. Keep the planned loss in account currency and calculate the entry-to-invalidation distance separately. If the trade thesis or stop changes, recalculate rather than relying on the original quantity.
- Allow for costs. Include the fees and slippage you intend to account for, or reduce the calculated quantity so the planned-loss amount is not entirely consumed by the price move alone. Check what fee assumptions the venue calculator uses.
- Calculate the linear-contract notional, if applicable. Use the multiplier and entry price, then compare the resulting exposure with the venue’s applicable maintenance-margin tier and contract requirements.
- Run the venue’s liquidation calculator. Select the correct direction, contract, margin mode, and position size. Include extra margin or other account information where relevant, and check whether other positions or orders enter the calculation.
- Compare liquidation with invalidation. If estimated liquidation is closer to entry than the invalidation level, the trade may be liquidated before the intended exit. Reconsider quantity, margin configuration, or the trade plan; do not assume that adding leverage is a risk-control method.
- Recheck after material changes. Position additions, partial closes, collateral changes, mark-price movement, fees, and tier changes can all alter the estimate. A prior calculator result may no longer describe the current position.
For each check, record the inputs you used: contract, direction, quantity, entry, invalidation, margin mode, mark-price basis, risk tier, fee assumptions, and any account collateral or other positions considered. This makes it easier to identify why two calculator outputs differ without assuming that one formula applies universally.
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Two estimates can differ because they are based on different contracts, margin modes, maintenance tiers, fee assumptions, or account states. Before comparing outputs, align the inputs rather than comparing only the displayed price.
- Contract type: A linear USDT/USDC-margined contract and an inverse contract can have different P&L and liquidation formulas.
- Margin mode: Isolated calculations can use position-assigned margin; cross calculations may incorporate shared wallet balance and other positions.
- Tier and exposure: The maintenance rate or tier-specific amount can change with notional and, on some venues, combined exposure from orders and positions.
- Price basis: A mark-price-based liquidation estimate need not match a calculation based on last traded price.
- Fees and additional margin: Closing-fee assumptions, taker-fee rates, and extra margin can change an estimate.
- Account state: Wallet balance, realized and unrealized P&L, and other contracts may be included in a cross-margin calculation.
If the inputs are not identical, the difference does not necessarily indicate an error. If they appear identical, check the venue’s current formula and calculator assumptions, including whether its tier and fee inputs match the position at the time of calculation.
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What are the most important mistakes to avoid?
- Choosing size from leverage. Leverage is not a loss budget. Start with the amount at risk and the invalidation distance, then check margin separately.
- Treating a stop as guaranteed execution. A planned exit price is an input to the risk estimate, not proof that a fill will occur there or before liquidation.
- Using a linear formula for an inverse contract. The simple multiplier arithmetic may not fit the contract’s settlement and P&L rules.
- Ignoring the maintenance tier. A notional change can change the applicable requirement and liquidation estimate.
- Checking Last Price but not the liquidation reference. Binance says Mark Price is used for liquidation in the futures product described in its guide; other products and venues require their own confirmation.
- Assuming cross-margin estimates are position-only. Shared collateral, other positions, and account P&L can enter the calculation.
- Using stale calculator inputs. An estimate based on an earlier size, tier, price, or account state may not represent the live position.
There is no single liquidation price that can be calculated from the title-level information alone. A live number requires the exact venue, contract, side, size, margin mode, applicable tier, price basis, fees, and—in cross margin—relevant account conditions. Use current official contract specifications and a venue-maintained calculator for that number.
Frequently Asked Questions
Can a position be liquidated before its stop-loss is filled?
Yes. If the liquidation threshold is reached first under the venue’s mark-price and margin rules, the venue may close the position before the stop executes. A stop also does not guarantee a fill at its trigger price, so it cannot be treated as a hard cap on realized loss.
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Additional collateral can affect the estimate, but the result depends on whether it is assigned to an isolated position or included in shared cross margin, along with the contract’s rules and fees. Confirm the changed inputs in the venue calculator rather than assuming a fixed shift.
Can I compare liquidation prices from two exchanges directly?
Only with care: the values may use different mark-price rules, contract formulas, fee assumptions, margin modes, tiers, or account inputs. Compare the underlying assumptions as well as the displayed prices.
What happens if I do not have a stop price yet?
You do not yet have the entry-to-invalidation distance needed for this method of position sizing. Define the price or condition that would invalidate the trade thesis first; otherwise, a quantity based on a chosen loss amount alone does not establish where the trade should be exited.
