How to Avoid Liquidation in Crypto Futures: the Leverage and Margin Math

Liquidation is arithmetic, not bad luck

A perpetual futures position is liquidated when its margin can no longer cover the exchange's maintenance requirement. Nothing about that event is random: it is a function of your leverage, the venue's maintenance-margin rate, and fees. Traders who get liquidated 'unexpectedly' almost always sized the position without ever computing where that line was.

The approximate shape, for an isolated long: the liquidation price sits roughly at entry × (1 − 1/leverage + maintenance rate). Higher leverage pulls the line toward your entry; the maintenance rate pulls it slightly closer still.

An illustration at 10x

Entry $60,000 on a BTC perpetual, isolated margin, 10x leverage, and a venue maintenance rate of 0.5%: the line falls near $60,000 × (1 − 0.10 + 0.005) = $54,300 — about 9.5% below entry. At 25x the same account of arithmetic puts it around 3.5% below entry; at 50x, under 2%. An ordinary hourly wick covers 2%.

Treat every such number as an illustration, not a quote. Real venues tier the maintenance rate by position size, funding accrues, and mark price — not last price — is what triggers the engine. The exact line comes from your venue's own rules; a serious tool verifies those before quoting a number, and so should you.

The stop should fire first

The practical rule that falls out of the math: your stop-loss must sit between your entry and the liquidation line, with room to spare. If the liquidation line is closer than your intended stop, the position is over-leveraged for that trade — the exchange's engine, with its liquidation fee, has become your effective stop.

Working backwards is safer than working forwards: choose the stop from your analysis, choose the risk budget from your account, and let those two derive the size and the leverage. Leverage chosen first is a conclusion in search of an argument.

• Decide the stop price from structure, not from the margin left.
• Compute size from risk budget ÷ stop distance — the same formula as any instrument.
• Check the implied liquidation line sits well beyond the stop.
• If it does not, reduce leverage or size — the trade idea has not changed, only its financing.

Funding and fees eat the buffer

A position held across funding windows pays or receives the funding rate every interval — on a leveraged position, an apparently small rate compounds into real margin drain. Entry and exit fees subtract from the same buffer. A position that would survive the price path on paper can still be liquidated by the slow leak of costs it was never sized to carry.

Common questions