Position Size Calculator
Know your risk before you enter. Calculate the exact position size for any trade based on your account, risk tolerance, and stop loss.
Account
Trade Setup
Your Position
How Position Sizing Protects Your Capital
The 1% rule: Risk no more than 1% of your account on any single trade. On a $10,000 account, that means your maximum loss per trade is $100. This keeps you in the game even through a string of losses.
Stop loss placement matters: A wider stop means a smaller position. A tighter stop means a larger position. The calculator adjusts automatically. Never move your stop to fit a position size you want — adjust the position to fit the stop the chart tells you.
Risk-reward ratio: A 1:2 ratio means you risk $1 to make $2. You only need to be right 34% of the time to break even. A 1:3 ratio brings that down to 25%. Good position sizing turns an average strategy into a profitable one.
Forex lot sizes: Standard lot = 100,000 units. Mini lot = 10,000. Micro lot = 1,000. The calculator shows all three so you can use whichever your broker supports.