What this futures calculator does
A crypto futures calculator turns the four numbers you set when opening a leveraged perpetual trade — entry, exit, leverage and margin — into the figures that actually matter: your profit or loss, your ROI on margin, the full position size you control, and the liquidation price that ends the trade if the market moves against you. Because the entry auto-fills from the live market price, the numbers you see match what you'd really trade right now.
Futures, and specifically perpetual futures, let you control a position much larger than your collateral. That magnifies both gains and losses, so knowing your exact PnL and liquidation price before you click buy is the difference between a planned trade and a gamble.
How to use it
- Pick your coin. The entry price auto-fills with the live market price from the ticker.
- Choose Long or Short. Longs profit when price rises; shorts profit when it falls. The PnL formula flips with your direction.
- Set your exit price — your take-profit target or your stop.
- Set your leverage with the slider or by typing it (1×–125×).
- Enter your margin — the collateral you're posting. Read your PnL, ROI, position size and liquidation price, all updating live.
The exact formulas
This calculator uses the standard contract maths every major exchange applies:
The key idea is that quantity is fixed at entry: your margin and leverage buy a set number of coins, and every dollar the price moves changes your PnL by that quantity. The 1/Leverage term in the liquidation formula is your initial margin rate — the share of the position your own collateral covers — and the 0.005 is the 0.5% maintenance margin rate the exchange keeps as a buffer.
Worked example
Suppose you go long BTC at $60,000, plan to exit at $66,000, use 10× leverage and post $1,000 of margin — the calculator's defaults. Quantity = 1,000 × 10 ÷ 60,000 = 0.16667 BTC. Your notional position is 1,000 × 10 = $10,000. PnL = (66,000 − 60,000) × 0.16667 = $1,000.00, which is a +100.00% ROI on your margin — a 10% price move became a 100% return because of the 10× leverage. Your liquidation price is 60,000 × (1 − 0.10 + 0.005) = $54,300, a 9.5% drop away. So this trade risks roughly $1,000 of margin to make $1,000, with about 9.5% of breathing room before liquidation.
When and why traders use it
Traders reach for a futures calculator at three moments. Before entering, to size a trade so the potential reward justifies the risk and the liquidation price sits beyond a sensible stop. While in a position, to see what a given exit would actually bank and whether to take partial profit. And when planning leverage, to compare how 5×, 10× and 25× change both the ROI and how close liquidation creeps to entry. Running the numbers first is how disciplined traders avoid being surprised by a position that was bigger — or more fragile — than it felt.
Common mistakes
- Confusing margin with position size. A $1,000 margin at 10× is a $10,000 position. Your PnL and liquidation are based on the $10,000, not the $1,000.
- Chasing ROI with leverage. Doubling leverage doubles your ROI on a winning move, but it also halves the distance to liquidation. The percentage looks great until a normal pullback ends the trade.
- Ignoring fees and funding. This tool shows clean PnL. Real trades pay entry and exit fees plus periodic funding, which shave net profit and pull real liquidation slightly closer.
- Setting a stop below the liquidation price on a long. If your stop sits past liquidation, the exchange closes you first — set stops inside the liquidation level so you exit on your own terms.
From calculator to exchange
The figures here match the isolated-margin model used by the major derivatives venues, so they transfer cleanly to a real order ticket. Exact liquidation can differ by a touch because each exchange applies its own maintenance-margin tiers — larger positions face higher rates and liquidate a little earlier — and because real fills include fees and funding. Trading on a venue with deep liquidity and clear, published margin tiers keeps your real outcome closest to the numbers above and reduces the chance of being closed early on a thin wick.