Partial Liquidation Math: How to Calculate Profit and Loss After a Margin Call

You open your futures app and see the damage: your position is 40% smaller, your margin balance took a hit, and a liquidation fee you never agreed to has been deducted. Partial liquidation saved you from a full wipeout — but what exactly did it cost? For the market-wide side of what hit you, read our explainer on how crypto liquidation events work and how $46M wipeouts affect spot holders.

The Worked Example: 5x Long on Bitcoin

You post $5,000 of margin and open a 5x leveraged long on BTC at $80,000. Your notional position is $25,000 — that is 0.3125 BTC (25,000 / 80,000 = 0.3125), of which $20,000 is effectively borrowed.

Bitcoin drops to $74,500, a 6.875% fall. Your position is now worth 0.3125 × 74,500 = $23,281.25, an unrealized loss of $1,718.75. Equity has shrunk to $3,281.25. The maintenance margin ratio is breached, and the exchange steps in — but it does not nuke the whole position. It partially liquidates 40%.

Key takeaway: a 6.875% price move against a 5x position destroys 34.4% of your margin before any liquidation even happens (1,718.75 / 5,000 = 0.34375). Leverage multiplies the damage long before it multiplies the drama.

What the Exchange Actually Did

Partial liquidation sells a portion of your position at market to shrink the notional and restore the margin ratio. The exchange sells 40% of your BTC: 0.125 BTC × $74,500 = $9,312.50. It charges a 0.5% liquidation fee: 0.005 × 9,312.50 = $46.56. Net proceeds of $9,265.94 go straight to repaying your borrowed funds, so debt falls from $20,000 to $10,734.06.

The realized loss on the liquidated slice: its cost basis was 40% of the $25,000 total ($2,000 of your margin plus $8,000 of borrowed funds) = $10,000. Subtract the net proceeds: 10,000 − 9,265.94 = $734.06 realized loss — the $687.50 market loss plus the $46.56 fee, both out of your margin.

The Full Damage Table

Check the consistency: $734.06 realized + $1,031.25 unrealized = $1,765.31, and $5,000 margin − $3,234.69 remaining equity = $1,765.31. Key takeaway: always reconcile the two ways — realized-plus-unrealized must equal the drop in your margin balance, or you are missing a fee somewhere.

The Liquidation Price Formula

The hard liquidation price for a long — where equity hits zero — is approximately:

Liquidation price ≈ Entry price × (1 − 1/Leverage + Maintenance margin rate)

With an $80,000 entry, 5x leverage, and a 0.5% maintenance margin rate: 80,000 × (1 − 0.2 + 0.005) = 80,000 × 0.805 = $64,400. That is where the position would be fully liquidated with no intervention.

So why did partial liquidation trigger at $74,500, far above $64,400? Exchanges do not wait for zero equity. When your margin ratio hits the maintenance threshold, the engine sheds position size to pull the ratio back up — a rescue operation, not an execution. Every venue implements this slightly differently, so check the Binance Futures documentation on liquidation for the exact thresholds and fee schedule on your exchange.

Why Partial Liquidation Exists

Partial liquidation protects both you and the exchange. Selling 40% of the position shrinks the notional from $25,000 to $15,000, which cuts the maintenance margin requirement proportionally and restores a healthy ratio. Waiting until $64,400 and liquidating everything at once would risk slippage eating through your remaining margin and leaving the exchange with an uncollectible shortfall.

For you, the trade-off is brutal but real: you paid $46.56 in fees and locked in a $734.06 loss on the sold slice, but you still hold 0.1875 BTC of exposure with $3,234.69 of equity. If Bitcoin recovers toward $80,000, the remaining position recovers dollar for dollar.

Adding Margin vs Letting It Liquidate

You had one escape hatch: topping up margin before the trigger. Adding $1,000 would have raised equity to $4,281.25 at $74,500, likely keeping the margin ratio above the maintenance threshold — avoiding the $46.56 fee and, more importantly, the forced sale at a local low. This is the same logic behind our piece on how to calculate profit on leveraged tokens and the volatility decay trap: leverage punishes inaction on the way down.

The catch is that fresh margin is fresh risk. Had BTC continued to $64,400, that extra $1,000 would have been liquidated too. Adding margin only makes sense with a genuine price thesis and a stop level — not as a reflex to avoid an unpleasant notification.

Conclusion

Partial liquidation turned $5,000 of margin into $3,234.69 of remaining equity: a $1,765.31 loss split into $734.06 realized (including the $46.56 fee) and $1,031.25 unrealized on the 0.1875 BTC you still hold. The math is unforgiving but knowable — and once you can compute your real loss, you can size your next position so a 6.875% move never costs you 35% of your margin again.

Model your next trade first: run the entry, leverage, and price scenarios through our profit calculator before you post margin — knowing your liquidation price in advance is the cheapest insurance in crypto.

Check CoinGecko for live BTC prices when planning entries. This article is for educational purposes only and is not financial advice. Leveraged trading carries a high risk of loss, including total loss of margin — always do your own research and never trade with funds you cannot afford to lose.