Adding margin buys distance, not a better trade
When an isolated position moves against you, its margin is being eaten and the liquidation price sits at a fixed distance set by your leverage. Topping up collateral does one specific thing: it moves that liquidation price further away. The mechanism is simple — liquidation happens when your losses have burned through the margin down to the maintenance requirement, so more margin means the price has to travel further to get there. The same notional now rests on a bigger cushion, which is exactly the same as saying your effective leverage has dropped. A $10,000 position on $500 of margin is 20x; add another $500 and it's the same position at 10x, with the liquidation price roughly twice as far away.
What adding margin does not do is worth spelling out. It doesn't move your entry, so your break-even is unchanged. It doesn't reduce the loss you're already carrying — that unrealised PnL is the same the instant before and after. And it doesn't improve the odds of the trade; it only buys time for the thesis to play out. That's the honest framing of this tool: it tells you the price of defending a position, so you can decide whether the position is worth defending. Sometimes the answer the number gives you is "that's a lot of good money after bad" — and closing part of it with the position size calculator is the better move.
How to use it
1. Pick long or short and enter your entry price and position size in coins.
2. Enter the leverage you opened at and the exchange's maintenance margin rate (often 0.4–1% for majors).
3. Set the target cushion — how far, in percent, you want the liquidation price to sit from your entry.
4. Read the margin to add, and check the table to see what a bigger or smaller cushion would cost. Add the optional current price to see how much room you have right now.
Add margin or cut the position?
Both increase your distance to liquidation. Adding margin keeps the whole position and commits more capital to it — sensible only when the setup is still valid and the extra risk is affordable. Trimming the position cuts exposure, banks a smaller loss and frees capital instead of locking more of it up. The trap this calculator is designed to expose is the reflex of pouring margin into a trade purely to avoid being liquidated, when the market has already told you the idea was wrong. Size the defence to the volatility you expect with the volatility liquidation risk calculator, and confirm the exact level with the liquidation calculator.
Common mistakes
Topping up to clear the current price by a hair. A cushion that only just clears spot gets hit by the next ordinary wick — size it to a real daily move. Adding margin repeatedly on the way down. Each top-up deepens your commitment to a losing trade; there's no rule that says you must defend it. Forgetting the maintenance margin. Liquidation triggers slightly before your margin hits zero, so the real distance is a touch smaller than "margin ÷ notional". Confusing it with cross margin. On cross margin your whole balance already backs the position; this calculator models the isolated case, where you top up one position deliberately.
FAQ
Will adding margin lower my liquidation price on a long? Yes — for a long, more margin pushes the liquidation price down, further below the current price. For a short it pushes it up, further above. Either way the gap to the danger line widens.
Does adding margin change my entry or PnL? No. Entry, break-even and unrealised PnL stay exactly the same. Only the liquidation price and your effective leverage change.
Can I remove the margin again later? On most exchanges, yes — isolated margin can usually be reduced back down as long as the position stays above its maintenance requirement, which pulls the liquidation price back in. Treat a top-up as reversible, not permanent.