Position Size Calculator
Size a trade by risk, not by guesswork. Enter your account size, the percentage you are willing to risk, your entry price and your stop-loss, and the calculator tells you how large a position keeps your loss within that limit if the stop is hit.
How to use the Position Size Calculator
- Enter your total account size in US dollars.
- Set the percentage of the account you are willing to risk on this trade.
- Enter your planned entry price and your stop-loss price.
- Read the position size, position value, and how much of your account it uses.
Why position sizing matters
Position sizing is the practice of deciding how much to buy based on how much you are prepared to lose, rather than on how confident you feel. It is one of the core tools of disciplined risk management.
How the calculation works
The calculator multiplies your account size by your risk percentage to find the dollar amount at risk, then divides that by the distance between your entry and stop-loss prices. The result is the number of units that limits your loss to that amount if the stop is hit.
These tools are provided for information only and do not constitute financial or investment advice. Figures may be delayed. See our Methodology for data sources.