Free Tool
Position Size Calculator
Size a trade from your account, the risk you’ll accept, and your stop-loss.
Position sizing manages risk; it does not guarantee outcomes. Not financial advice.
How to size a position by risk
Disciplined traders decide how much of their account they are willing to lose on a single trade — often a small percentage — before they decide how large the position should be. Enter your account size and that risk percentage, then your entry and stop-loss prices. The calculator works out the distance to your stop, then the position size that keeps your loss at the stop equal to the amount you chose to risk.
If you add a target price, it also shows your risk-to-reward ratio: how much you stand to gain relative to what you are risking. A ratio above 1 means the potential reward exceeds the risk on paper. This is a planning tool — real fills, gaps and slippage can move the actual numbers.