Calculating Swap Rate

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Forex Swap Rate Calculator

Calculate the overnight rollover interest for your currency positions.

Interest Differential: 0%
Daily Swap Amount: 0.00
Total Swap for Period: 0.00

*Positive values indicate interest earned; negative values indicate interest paid. Result is in the Quote Currency.

Understanding Forex Swap Rates

In the foreign exchange market, a Swap Rate (also known as a rollover rate) is the interest rate differential between the two currencies in a pair. Because Forex trading involves buying one currency and selling another simultaneously, you are effectively borrowing one currency to buy another.

If the interest rate of the currency you bought (base currency) is higher than the interest rate of the currency you sold (quote currency), you may earn interest. Conversely, if the base currency interest rate is lower, you will likely pay interest for holding that position overnight.

How the Swap Rate is Calculated

The mathematical formula for calculating the swap value is as follows:

Swap = (Position Size × Contract Size × (Interest Rate Differential – Broker Markup)) / 365 Days

Key components of this calculation include:

  • Position Size: Measured in Lots (1.00 is a standard lot).
  • Contract Size: Usually 100,000 units for standard lots.
  • Interest Rate Differential: The gap between the central bank rates of the two nations.
  • Broker Markup: The spread or commission the broker takes for managing the rollover.

Example Calculation

Imagine you are trading 1.00 Lot of EUR/USD (100,000 units). The European Central Bank has an interest rate of 4.00%, and the US Federal Reserve has a rate of 5.00%. Your broker charges a 0.25% markup.

  • Interest Differential: 4.00% – 5.00% = -1.00%
  • Subtracting Broker Markup: -1.00% – 0.25% = -1.25%
  • Daily Swap: (100,000 × -0.0125) / 365 = -3.42 Units per day.

In this scenario, you would pay approximately 3.42 USD per night for holding a long EUR/USD position.

The "Wednesday Triple Swap" Rule

It is crucial for traders to remember that the Forex market typically settles on a T+2 basis. Consequently, most brokers charge a triple swap on Wednesday nights to account for the weekend (Saturday and Sunday) where the market is closed but interest still accrues.

function calculateForexSwap() { var lots = parseFloat(document.getElementById("positionSize").value); var contractSize = parseFloat(document.getElementById("contractSize").value); var baseRate = parseFloat(document.getElementById("baseRate").value); var quoteRate = parseFloat(document.getElementById("quoteRate").value); var markup = parseFloat(document.getElementById("brokerMarkup").value) || 0; var days = parseFloat(document.getElementById("daysHeld").value); if (isNaN(lots) || isNaN(contractSize) || isNaN(baseRate) || isNaN(quoteRate) || isNaN(days)) { alert("Please enter valid numerical values in all required fields."); return; } // Calculation Logic // Interest Differential = (Base – Quote – Markup) var annualDiffPercent = baseRate – quoteRate – markup; var decimalDiff = annualDiffPercent / 100; // Daily Swap = (Lots * ContractSize * DecimalDiff) / 365 var dailySwap = (lots * contractSize * decimalDiff) / 365; var totalSwap = dailySwap * days; // Update UI document.getElementById("resDiff").innerText = annualDiffPercent.toFixed(2) + "%"; document.getElementById("resDaily").innerText = dailySwap.toFixed(2); document.getElementById("resTotal").innerText = totalSwap.toFixed(2); // Color coding results if (totalSwap < 0) { document.getElementById("resTotal").style.color = "#d93025"; } else { document.getElementById("resTotal").style.color = "#188038"; } document.getElementById("swapResult").style.display = "block"; }

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