Position Size Calculator
A complete pre-trade check: enter entry, stop and take-profit prices plus your risk rule, and get the position size that keeps the loss inside your risk budget.
How is this calculated?
Position size = risk amount ÷ (stop distance in pips × pip value per lot)
- The trade direction is inferred from the price order: entry above the stop loss means a long trade.
- The stop distance is converted to pips using the instrument’s pip size.
- The take profit should sit on the opposite side of the entry from the stop loss — the calculator checks this.
Frequently asked questions
What is the difference between lot size and position size?
They are the same number expressed differently: position size in lots, in units of the base currency, or as monetary value. The calculator shows all three.
Why does my stop loss change my position size?
A tighter stop means less money is lost per lot if it is hit, so the same risk budget allows a larger position. A wider stop forces a smaller position.
Is the risk/reward ratio shown guaranteed?
No. It is measured from the prices you enter, assuming both orders are filled at those prices. Slippage and gaps can change the real outcome.
Related calculators
- Lot Size CalculatorCalculate the right forex lot size from your account balance, risk percentage and stop loss. Floors to whole micro lots so you never risk more than planned.
- Risk/Reward CalculatorCheck the risk/reward ratio of any forex trade before you enter it: risk to stop loss versus reward to take profit, with money amounts if you add a lot size.
Related guides
Results are estimates, not financial advice. Actual broker conditions may differ.