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Position size calculator
Most calculators ask you for your stop loss. This one proposes it — from the coin's live 14-period ATR — then sizes the position and shows what liquidation, fees and funding do to it. Live data for 254 coins.
Liquidation is approximated as a {1 ÷ leverage} adverse move and excludes exchange maintenance margin, so real liquidation occurs slightly earlier than shown. Fees assume a 0.15% round-trip taker rate; your exchange's schedule may differ. Funding is the current mean 8-hour perpetual rate and changes continuously. Arithmetic only — not financial advice.
How the numbers are worked out
The whole calculation hangs off one number: how far your stop sits from entry. Position size is simply the amount you are willing to lose divided by that distance — risk ÷ stop distance. Everything else follows.
That is why guessing the stop is the expensive mistake. Put it 2% away on a coin whose ordinary daily range is 12% and it will be taken out by noise before the idea has a chance. We take the stop from the coin's own 14-period ATR, so it adapts per coin instead of applying one arbitrary percentage to everything.
Leverage does not change your risk — the stop does. Leverage changes the margin you post and how close liquidation sits. If liquidation would be reached before your stop, the stop is decorative; that is the single most useful thing this page tells you, and it is why liquidation distance is shown next to stop distance rather than buried.
Fees are charged on notional, not margin, so leverage multiplies their bite on your equity. We assume a 0.15% round-trip taker fee — the same assumption our live engine uses in its published performance ledger. Funding is the current mean 8-hour perpetual rate, available for 229 of these coins.
This is arithmetic, not advice. It contains no view on whether a trade is good, no expected return and no probability of success. Risk percentage is your input. Losses can exceed expectations in fast markets, and no stop placement guarantees an exit at your chosen price.
Common questions
How do you calculate position size in crypto?
Position size = (account size × risk per trade) ÷ stop distance. If you have $10,000, risk 1% ($100), and your stop is 5% away, the position is $100 ÷ 0.05 = $2,000. The stop distance drives everything — which is why guessing it is the most common mistake. This page derives it from the coin’s actual measured volatility instead.
What is a good risk per trade?
Most risk-management literature uses 0.5%–2% of account equity per trade, on the reasoning that a run of losses should not remove your ability to keep trading. Smaller is more survivable. The right number depends on your own circumstances and risk tolerance — this calculator takes it as your input and does not recommend a figure.
How does leverage affect position size?
It does not change how much you risk — the stop does. Leverage only changes how much margin you must post for the same position. Higher leverage means less margin locked up but a nearer liquidation price. The calculator shows liquidation distance alongside your stop so you can see whether liquidation would occur before your stop is reached, which is the failure mode that matters.
Why use ATR to set a stop instead of a fixed percentage?
Because a 2% move is routine for one coin and extreme for another. A fixed percentage stop is too tight on volatile coins (stopped out by ordinary noise) and needlessly wide on calm ones. Sizing the stop as a multiple of ATR adapts to each coin automatically. ATR is backward-looking and says nothing about direction — it sizes the noise, not the outcome.
Do fees and funding change the maths?
Yes, and most calculators ignore both. A round-trip taker fee is charged on notional, not on margin, so leverage multiplies its impact on your equity. Perpetual futures also charge or pay funding periodically while the position is open. This page shows both against the same position so the cost is visible before you commit, not after.