How is leverage calculated in trading?

Leverage is calculated by dividing the total value of a position by the margin required to open it, forming a leverage ratio. For example, if a trader opens a position worth €10,000 and the required margin is €500, the leverage ratio is €10,000 ÷ €500 = 1:20. This means the trader's market exposure is twenty times greater than the capital they have committed to the trade.

The calculation also works in reverse. If a trader knows the leverage ratio offered for a particular instrument, they can quickly determine the margin required. With 1:10 leverage, the margin requirement is 10% of the position value; with 1:20, it is 5%; and with 1:30, approximately 3.33%. This inverse relationship between leverage and margin percentage is a useful reference point when planning trades and assessing how much capital will be tied up in each position.

Understanding how leverage is calculated helps traders make more informed decisions at every stage of the trading process. Before opening a position, it allows them to estimate exactly how much margin will be required and how much free capital will remain in their account. While a position is open, knowing the effective leverage helps assess how sensitive the account balance is to market movements — higher leverage means greater sensitivity and therefore greater potential for both profit and loss. Traders who regularly calculate and monitor their leverage across all open positions are better positioned to manage their overall portfolio risk, avoid over-exposure, and maintain a sustainable approach to trading over the long term.