Simply, free margin is the money in a trading account available for trading. To calculate free margin, you must subtract the margin of your open positions from your equity (i.e. your balance plus or minus any profit/loss from open positions).
Free margin = equity - margin
Free margin = (balance + profit or balance - loss) - margin
Let's look at an example.
Joe has a balance of $10,000. He opens a trade for 2 lots (2 x 100,000 = 200,000) of EURUSD at an exchange rate of 1.20000. His account's leverage is 1:50. The total trade position is 200,000 x 1.20000 = $240,000. The required margin for this particular position is 240,000/50 = $4,800. The free margin at this stage is $10,000 - $4,800 = $5,200 as there is no profit or loss.Now, let's say that the price of EURUSD drops to 1.19050, which is a loss of 0.00950 pips (1.20000 - 1.19050), equivalent to $240,000 x 0.00950 = $2,280 (loss).
Using the formula to calculate free margin, taking into consideration the loss as a result of the change in price, we see the free margin amount has decreased.
Your free margin – also called ‘usable margin’ - is necessary to withstand any negative price fluctuations in your open trades and to open new leveraged trades. Free margin increases with profitable positions and decreases with losing positions.
Margin level = (equity/used margin) x 100Let's say your equity is $8,000 and you've used $2,000 of your margin, your margin level is calculated as:
Margin level = ($8,000 / $2,000) x 100
Margin level = $4 x 100
Margin level = 400%
When markets move against your open positions, your margin level falls. If it ever falls close to a fixed percentage as agreed with your broker, you’ll be notified with a margin call.
For example:
Let's say your balance is $5,000, but you've taken $3,800 in losses, and you've used $2,000 of your margin. Your margin level will be:
Margin level = ($5,000 - $3,800) / 2,000 x 100
Margin level = 60%
If you have a margin call set at 40% and your current margin level is 60%, you'll receive a margin call if your margin level drops by another 20%. At that point, you'll need to respond to the margin call by either depositing more funds to your trading account or closing positions to free up more margin.
With no margin left to cover any potential losses from open positions, you’ll receive a margin call. This is when you'll need to either deposit funds to top up your account, close open positions, or both.
If your open positions prove to be profitable, your equity will increase, which means that you’ll have more free margin. Of course, you can also make a deposit to your account and increase the overall balance.
The margin is the money you put up in order to use leverage, so the two are interlinked. For example, the margin is 10%, the leverage is 10:1, and if it’s 20%, the leverage is 5:1. Take a look at our guide to margin requirements.
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