Forex Margin Calculator: How to Calculate Required Margin Before You Trade
BY TIOmarkets
|March 20, 2026Before opening any leveraged position, knowing how much margin will be reserved in your account is not optional. It is a basic requirement of responsible position management.
A trader who opens multiple positions without calculating the margin requirement for each one risks having insufficient free margin to sustain those trades or to open new ones, and may face a margin call or stop out before the market has had time to move in their favour.
This article explains what margin is, how the required margin figure is calculated, how leverage affects that calculation, why margin requirements vary between instrument types, and how to use a margin calculator to get an accurate figure before placing a trade.
What Is Margin in Forex Trading?
Margin is the amount of capital that your broker sets aside from your account balance as collateral when you open a leveraged position. It is not a fee or a cost: it is a deposit held against the position for as long as it remains open, and it is returned to your free margin when the position is closed.
The margin requirement is expressed as a percentage of the full notional value of the position. A one percent margin requirement means that to open a position with a notional value of 100,000 USD, you need 1,000 USD held as margin. The remaining 99,000 USD of exposure is provided by leverage.
It is important to distinguish between margin and the total risk of the position. The margin figure tells you how much capital is reserved, not how much you can lose. A position can lose more than its margin requirement if the market moves against you, which is why stop-loss management and monitoring free margin levels are essential parts of trading with leverage.
Used Margin, Free Margin, and Equity
Your account balance at any given moment is divided between used margin, which is the total margin held across all open positions, and free margin, which is the remaining capital available to open new positions or absorb unrealised losses. Equity is your balance adjusted for any unrealised profit or loss on open positions.
As open positions move against you, your equity falls, which reduces your free margin. If your equity falls to the margin call level, you will receive a margin call. If it falls further to the stop out level, positions will begin to be closed automatically to protect the remaining capital. Understanding these levels before you trade, and monitoring them while positions are open, is part of basic account management.
How Required Margin Is Calculated
The required margin for a position is calculated using the following relationship: required margin equals the notional value of the position multiplied by the margin percentage.
The notional value of a standard forex lot is 100,000 units of the base currency. For EURUSD, one standard lot has a notional value of 100,000 EUR. For USDJPY, one standard lot has a notional value of 100,000 USD.
If the margin requirement for the instrument is one percent, the required margin in the quote or account currency is one percent of the notional value. For a one standard lot EURUSD position with a one percent margin requirement, the required margin is 1,000 EUR. To express this in USD, multiply by the current EURUSD exchange rate.
For position sizes smaller than a standard lot, the required margin scales proportionally. A 0.1 lot position requires one tenth of the margin of a standard lot. A 0.01 lot position requires one hundredth.
The Role of Leverage in the Calculation
Leverage and margin percentage are two ways of expressing the same relationship. A margin requirement of one percent is equivalent to leverage of 1:100. A margin requirement of two percent is equivalent to 1:50. A margin requirement of five percent is equivalent to 1:20.
The higher the leverage, the lower the margin requirement for a given position size, and therefore the less capital is reserved. This is why higher leverage allows traders to open larger positions with a smaller account balance, but it also means that smaller adverse price movements can bring equity down to the margin call or stop out level.
The leverage level you select when setting up your account affects the margin requirement for every position you open. Reducing leverage from 1:100 to 1:50 doubles the margin required for the same position size. Increasing leverage from 1:100 to 1:200 halves the margin required. Always confirm the leverage level applied to your account and to the specific instrument before calculating required margin.
Leverage and margin requirements are subject to change depending on market conditions and applicable regulatory requirements.
How Instrument Category Affects Margin Requirements
Margin requirements are not the same across all instruments. The margin percentage for a given instrument is set based on the volatility and liquidity characteristics of that market, and it varies between asset classes and sometimes between individual instruments within the same class.
For standard forex major and minor currency pairs, a one percent margin requirement is common. However, some pairs carry higher requirements. Currency pairs involving the Swiss franc, for example, typically carry a five percent margin requirement due to the historical volatility of that currency. Pairs involving less liquid currencies such as the Chinese renminbi or Hong Kong dollar may carry even higher requirements.
For commodities such as gold and oil, and for indices, margin requirements are calculated on a different basis from standard forex pairs and are typically higher. The same applies to individual stocks and cryptocurrency CFDs, where the margin percentage reflects the higher volatility of those instruments relative to major currency pairs.
This means you cannot apply a single margin percentage to all instruments. Always check the margin requirement for the specific instrument you intend to trade, either in the contract specification inside your trading platform or using a margin calculator that accounts for instrument type.
Worked Examples
The following examples illustrate the margin calculation in practice. Exchange rates used are illustrative and for educational purposes only.
For a one standard lot EURUSD position at one percent margin, the notional value is 100,000 EUR. One percent of 100,000 EUR is 1,000 EUR required margin. If the current EURUSD rate is 1.15 and your account is denominated in USD, the required margin in USD is 1,000 multiplied by 1.15, which equals 1,150 USD.
For a 0.5 lot GBPUSD position at one percent margin, the notional value is 50,000 GBP. One percent of 50,000 GBP is 500 GBP required margin. If GBPUSD is at 1.34 and your account is in USD, the required margin in USD is 500 multiplied by 1.34, which equals 670 USD.
For a one standard lot USDJPY position at one percent margin, the notional value is 100,000 USD. One percent of 100,000 USD is 1,000 USD required margin. Because the base currency is already USD, no exchange rate conversion is needed for a USD account.
These examples assume a one percent margin requirement and a single position. When multiple positions are open simultaneously, the total used margin is the sum of the individual margin requirements for each position, and free margin is your equity minus total used margin.
How to Use the TIOmarkets Margin Calculator
TIOmarkets provides a margin calculator at tiomarkets.com/margin-calculator. To use it, select the currency pair you intend to trade, choose your account base currency, select the leverage level applied to your account, enter the number of lots for the position, and click calculate. The calculator returns the required margin in your account base currency based on current rates.
The calculator note confirms that margin and leverage vary by instrument category: gold and commodities carry different leverage rates from forex pairs. This is consistent with the margin percentages defined in the contract specification for individual instruments.
The margin calculator is one of four trading calculators available from TIOmarkets. The suite also includes a profit calculator, a pip value calculator, and a lot size calculator. Using these tools together before entering a trade gives you a complete picture of the position: how much margin is required, what each pip of movement is worth, and what the potential profit or loss would be at a given price target.
Margin Levels: Margin Call and Stop Out
Two margin thresholds are particularly important for traders to know before opening positions: the margin call level and the stop out level.
The margin call level is the point at which your equity, expressed as a percentage of used margin, triggers a warning that your account is under pressure. At this point you may be prompted to deposit additional funds or reduce your exposure by closing positions.
The stop out level is the point at which the broker begins closing your open positions automatically, starting with the least profitable, to prevent your account from falling below zero. This happens without further notice and cannot be reversed once triggered.
Knowing these levels in advance allows you to calculate, before opening a position, the approximate price movement that would trigger each threshold given your current account equity and the size of the position you are considering. A margin calculator gives you the required margin figure; combining that with your account equity and the published margin call and stop out levels gives you a complete picture of the risk profile of the position.
Trading Margin at TIOmarkets
TIOmarkets offers leveraged trading across forex, indices, stocks, and commodities on MetaTrader 4 and MetaTrader 5. Leverage is available up to 1:500 on request on Raw and VIP Black accounts, and up to unlimited on the Standard account via MT5 under specific conditions. The Nano account also offers leverage up to 1:500 on request. All leverage figures are subject to change depending on market conditions and applicable regulatory requirements.
Margin call is set at 100% and stop out at 30% across all account types. An exception applies to the Standard account at 1:2000 leverage, where the stop out level is 40%. Maximum open and pending orders across all accounts is 200 per client.
The margin calculator accepts all account base currencies available at TIOmarkets and returns the required margin figure in your account currency based on current rates and the leverage level you select.
FAQ
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