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Forex Lot Size Calculator

What is this tool?

A forex position sizing calculator that converts your account risk parameters into a recommended lot size. Instead of picking a trade size arbitrarily, you define how much of your account you're willing to risk on a single trade, and the calculator works backward to a position size.

When to use it

  • Sizing a new trade before entering the market
  • Standardizing risk per trade across a trading plan
  • Comparing how different stop-loss distances change the required lot size
  • Checking position size after an account balance change
  • Reviewing risk consistency across multiple currency pairs

How to use it

  1. 1Enter your account balance and the percentage of the account you want to risk on this trade.
  2. 2Enter your stop-loss distance in pips and select the relevant currency pair, if applicable.
  3. 3The tool calculates the recommended position size (lot size) instantly.
  4. 4Adjust any input to see the position size update in real time.

Frequently asked questions

Does this calculator guarantee I won't lose more than my risk percentage?

No. It calculates a suggested position size based on your inputs, but actual losses can differ due to slippage, gaps, or broker execution. It is not a guarantee.

Do I need to know pip values to use this tool?

The calculator handles the pip-value math internally based on the inputs you provide; you mainly need your account balance, risk tolerance, and stop-loss distance.

Is this financial or trading advice?

No. This tool is for informational and educational purposes only. Forex trading involves substantial risk, and you should consult a licensed professional before trading.

Is my account information stored anywhere?

No. All calculations happen locally in your browser and are never saved or sent to a server.