What this tool does
The Position Size Calculator answers the most important question in risk management: how big should this trade be? You tell it your account balance, the percentage of your account you are willing to risk on one trade, and the distance to your stop-loss in pips. It then calculates the position size (in lots or units) that keeps your loss within that risk limit if the stop-loss is hit.
Professional traders rarely risk more than 1–2% of their account on a single trade. This tool makes that discipline automatic — instead of picking a lot size that "feels right," you let your risk tolerance decide. It does not predict whether the trade will win or lose; it simply keeps one bad trade from doing serious damage to your account.
How to use it
- Enter your account balance in your account currency.
- Set your risk per trade as a percentage (many traders use 1% or 2%).
- Enter your stop-loss distance in pips, based on your chart analysis.
- Select the currency pair so the calculator can work out the pip value.
- The tool returns the position size in lots and units that matches your risk.
- Round down, not up — it is always safer to risk slightly less than your target.