Size every trade so a single loss never costs more than you decided. Enter your account, risk %, entry, and stop — get the exact position size.
Fill in account size, risk %, entry and stop to size your position.
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Instead of guessing how much to buy, you fix how much you are willing to lose (e.g. 1% of the account) and let the stop distance determine the size. This keeps risk constant regardless of the coin or volatility.
Amount risked = account × risk%. Position size (units) = amount risked ÷ |entry − stop|. Position value = size × entry. With leverage, required margin = value ÷ leverage.
Most disciplined traders risk 0.5–2% of their account per trade. At 1%, it takes a long, sustained losing streak to do serious damage — which is the point of fixed fractional risk.
Position size (in units) = (account × risk%) ÷ the distance between entry and stop price. A tighter stop allows a larger position for the same dollar risk; a wider stop means a smaller position.
Leverage changes the margin required, not the dollar risk — that is set by your stop distance and size. But higher leverage moves your liquidation price closer, so keep the stop well inside it.