Free tool
Position Size Calculator
Size a position so a single losing trade only costs you a fixed, predetermined fraction of your account.
Results are estimates based only on the figures you enter, for information and education only. They are not investment advice or a forecast. Crypto and stock markets carry real risk, including the loss of capital.
Position sizing: the habit that protects accounts
Most investors obsess over what to buy and barely think about how much. Yet position size, not selection, is what usually determines whether a losing streak is a setback or a catastrophe. The idea is simple: decide in advance the most you are willing to lose on a single trade — often a small, fixed percentage of your account — and size the position so that hitting your stop-loss costs exactly that and no more.
This calculator does the arithmetic. Your risk budget is your account size times your chosen risk percentage. The distance between your entry and your stop-loss is your risk per unit. Dividing one by the other gives the number of units you can hold while keeping the loss within budget. Risking a small fraction per trade means even a long run of losers leaves your capital — and your ability to keep investing — intact. The risk/reward calculator is its natural companion.