Position Size Calculator

About the Position Size Calculator

A position size calculator works out exactly how large your trade should be based on your account balance, how much you're willing to risk, and your stop-loss distance — applicable across forex, stocks, and crypto alike. It removes the guesswork of picking a trade size and ties it directly to a risk amount you're comfortable with.

Why This Tool Exists

Trading the same lot size or dollar amount on every trade regardless of stop-loss distance means your actual risk varies wildly between setups. This tool exists to standardize that risk, so every trade you take puts the same percentage of your account on the line, no matter how tight or wide your stop-loss is.

How to Use It

1. Step 1. Enter your account balance.
2. Step 2. Set your risk percentage per trade, commonly 1-2%.
3. Step 3. Enter your entry price and stop-loss price (or stop distance in pips/points).
4. Step 4. Click Calculate to see your recommended position size.

Key Features & Benefits

• Ties position size directly to a defined risk percentage
• Works across forex, crypto, and stock trading
• Prevents accidental overexposure on tight or wide stop-loss setups
• Simple three-field input matched to standard risk management practice
• Useful for building a consistent, repeatable trading process
• Free and instant, no broker connection needed

How It Works

The core formula is Position Size = (Account Balance × Risk%) ÷ Stop-Loss Distance. If you have a $5,000 account, risk 2% per trade ($100), and your stop-loss is 50 pips or points away, your position size is calculated to ensure that if the stop-loss is hit, you lose exactly $100 — not more, not less — regardless of how the trade setup looks.

Frequently Asked Questions