To calculate the margin
Choose your currency pair, account currency and margin (leverage) ratio, enter your trade size (in units, 1 lot= 100,000 units) and click calculate. The calculator performs the current real-time prices for exact values.
For instance, for a USD account with leverage 1:100 and the current forex prices ,the margin cost is as follows:
Example Margin Rates for USD account, 1:100 leverage
Opening a trade excessive margin can make you a margin call. Opening a trade with not enough margin make a profitable trade with less effect on your trading account. As a result, the margin required should be fit with your risk appetite.
It is based on your account leverage and open positions, and each open trade in your account takes away from your available margin.
For example, a trade of 1 lot EURUSD would require $100,000 times the EURUSD rate in margin (to convert from base currency to deposit currency), so if price is 1.1912, this would mean a margin of $119,120, before leverage is applied.
Therefore, when you have an account balance of $100 and a leverage of 1:100, open positions with total margin of $5000, it would mean you’re left with 100*100-5000=$5,000 available margin.do not forget that although you can use higher leverage to increase available margin, this means taking higher risks.