The equation for calculating your Margin is as follows:

• LOTS X (PRICE X CONTRACT SIZE) / LEVERAGE 

Example: 

• 1.00 X ( 0.85450 X 100,000 ) / 500 = 170.90

You can find the mentioned data above in the example below:

You can locate the contract size of the specific pair from the SPECIFICATIONS section. 

For further details in that regard, click here.