Margin Calculator

Margin trading lets a trader control a position larger than their account balance by borrowing from a broker. It amplifies gains and losses by exactly the same factor, which is why the margin requirement is the first number to work out, not the last.

Key formulas: Margin Required = Position Size / Leverage Leverage = Position Size / Margin Required Margin Level % = (Equity / Used Margin) × 100 Profit/Loss = (Exit Price − Entry Price) × Position Size Return on Margin = Profit / Margin Required × 100

What each variable means:

• Position Size: total notional value of the trade (e.g., $100,000 in forex = 1 standard lot)
• Leverage: ratio of position size to margin (e.g., 50:1 means you control $50 for every $1 deposited)
• Margin Required: the collateral you must deposit to open the position
• Equity: account balance + unrealized profit/loss
• Margin Level %: broker monitors this; typically a margin call triggers below 100%, stop-out below 50%

Worked example: A forex trader wants to buy 1 standard lot (100,000 units) of EUR/USD at 1.1050. Broker offers 100:1 leverage.

Margin Required = $110,500 / 100 = $1,105 The trader only needs $1,105 to control a $110,500 position.

Price moves +50 pips (0.0050): Profit = 0.0050 × 100,000 = $500 Return on Margin = $500 / $1,105 = 45.2% on a 0.45% price move!

But if price drops 100 pips: Loss = $1,000, nearly wiping out the entire margin.

Margin level, and why it is not the same as maintenance margin

These two get confused constantly, and they are different quantities.

Margin Level % = (Equity ÷ Used Margin) × 100

Used margin is what the position ties up: $1,105 in the example above. Equity is your balance plus any unrealized profit or loss. If you funded the account with $2,000 and are down $300, equity is $1,700 and the margin level is 1,700 ÷ 1,105 = 154%.

Brokers act on the level, not on a dollar figure. A typical forex broker warns at 100% and force-closes at 50%. Stock brokers work differently: US Regulation T sets initial margin at 50% of the position and maintenance at 25% of it, so there the maintenance requirement really is half the initial one.

The practical consequence: how much room you have depends on how much you deposited, not just on the leverage. Fund an account with exactly the required margin and you are at 100% margin level before the trade has moved a single pip. Fund it with three times that and you can absorb a real move. The calculator below asks for your equity so it can work out the actual margin call price rather than guessing.

Risk reference:

• Retail forex in the US: max 50:1 (major pairs), 20:1 (minors)
• EU (ESMA): max 30:1 (major forex), 5:1 (crypto)
• Futures: margin is called initial margin (typically 3-12% of contract value)

Margin call happens when the margin level falls to the broker’s warning threshold, and you either deposit more or the position gets closed for you. Use stop-loss orders so that decision is yours and not the broker’s.