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Position size and risk calculator

Size a trade from your stop loss, see the margin, reward to risk, fees, break even win rate and a rough liquidation check.

Download the Excel file position-size-and-risk-calculator.xlsx, 9 KB

The one calculation most new traders skip. The same rule Cashilor uses for every bot: size comes from the stop, leverage only decides the margin.

What it does

  • From your balance, risk per trade, entry and stop, works out exactly how many units to trade.
  • Shows the margin needed at your leverage, and warns if the account cannot carry it.
  • Reward to risk, fees for the round trip, and the win rate you need just to break even.
  • Warns you when the liquidation price sits before your stop, which means the stop would never get used.
  • A table of what a losing streak does to the account at your risk level.

Not financial advice. It is a calculator. The decisions are yours.

Updated 17 Oct 2026. Free to use and share.