Leverage is a ratio that shows how much market exposure you control compared to your margin. For example, one to one hundred leverage means you control one hundred thousand dollars of exposure with one thousand dollars of margin.

You work out margin by taking the notional value of the position and dividing it by the leverage. For example, a one hundred eight thousand five hundred dollar position at one to one hundred leverage uses one thousand eighty five dollars of margin.

You select the instrument and leverage, enter your position size and price, and the calculator shows required margin, notional value, effective leverage, and margin level so you can see your exposure before you place the trade.

Effective leverage is the total value of all open positions divided by your account equity. It matters because it shows your true risk, many traders keep effective leverage below three to one or five to one to avoid large drawdowns.

A margin call happens when your equity falls close to or below the required margin, usually at one hundred percent margin level. The broker may ask you to add funds or close trades before they start closing positions automatically.

The stop out level is the margin level where the broker starts closing positions without your input to prevent the account from going negative. It is often between twenty and fifty percent margin level, but it depends on the broker.

Many experienced traders stay below five to one effective leverage, and very few trade above ten to one for long. Lower leverage gives more room for normal price swings and news spikes without hitting margin call.

Margin level compares equity to used margin as a percentage, while free margin is simply equity minus used margin. You can have a high margin level but low free margin if you already have several positions open.

With most regulated brokers that offer negative balance protection, your loss is limited to your deposit. With some offshore brokers and during extreme price gaps, it is possible to owe money if protections are not in place.

Each trade uses its own margin, and the total used margin is the sum of all individual requirements. The calculator can add up margin across positions so you can see overall exposure and how much free margin remains.

Higher leverage reduces the margin needed for the same position size, while lower leverage increases it. For example, moving from one to fifty to one to one hundred halves the margin requirement but doubles your potential percentage swings.

You can trade smaller position sizes, keep a larger cash buffer in the account, avoid stacking many correlated trades, and reduce exposure before high impact news events so your margin level stays well above one hundred percent.