Position size calculator
Position size starts from risk, not from the profit you hope for. Enter the account balance, the percentage you accept losing on one trade, the entry price and the stop loss.
The result excludes commission, spread and slippage, and on volatile markets a stop can fill below the level you set. This is not investment advice.
Frequently asked questions
What risk percentage is reasonable?
Many professionals stay between 0.5% and 2% of the account per trade. At 1% it takes a run of more than 20 consecutive losses to give up a quarter of the capital.
Why does the stop distance matter?
The money at risk is fixed; it is divided by the distance between entry and stop. A wider stop means a smaller position, not a bigger risk.
Does it work for short positions?
Yes. Put the stop above the entry price; the calculator uses the absolute difference.