Work out position sizing instantly with clear inputs, formula shown and shareable results.
Position size should follow from risk, not conviction. Fixing the loss you accept per trade and dividing by the distance to your stop gives the quantity, so a wider stop automatically produces a smaller position.
Position size
Quantity = (account × risk %) / |entry - stop|
Figures are estimates for planning only. Market returns are not guaranteed, and rates, limits and tax rules change. This is not financial or tax advice — speak to a qualified adviser before acting.
It lets a long losing streak occur without crippling the account — ten consecutive losses cost under 10%.
The formula produces a large position, so also cap exposure as a share of the account to control gap risk.