Position Size Calculator

The Forex position size calculator is a trader’s most valuable tool. It allows you to calculate the exact position size for any trade so that you always stay in control of your risk and avoid blowing out your account on a single trade.

Enter the values below and select “Calculate” to use the lot size calculator.


The Forex calculator above works with all major currency pairs and crosses as well as eight different account currencies. You can also toggle between a risk percentage or a fixed dollar amount.

Position Size Calcualtor FAQ

What does the position size calculator do?

This Forex calculator provides you with a position size in standard, mini, and micro-lots based on the variables you enter.

What do I enter for the account currency?

The account currency field pertains to the type of currency you use in your trading account. So if you are in the U.S., this will likely be USD. If you’re in the UK, you would choose GBP, etc.

What risk percentage should I use?

When in doubt, don’t go over 2% of your account balance. I prefer anywhere from 1% to 2% risk to make sure I can keep my emotions in check.