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Forex Swap Calculator

Calculate daily and total swap (rollover) charges or credits. Enter your trade details below — your broker's swap rates are usually visible in the trading platform's symbol specification.

Swap Calculator

Calculate overnight financing costs

1 = standard lot

Number of nights to hold the position

Negative = cost, positive = credit

Auto-filled from symbol

The day your broker charges 3× swap to account for the weekend

What is a Forex Swap?

A swap (also called a rollover or overnight financing fee) is an interest adjustment applied to forex positions held open past the daily market close — typically 5:00 PM EST. It reflects the interest rate differential between the two currencies in the pair.

How is swap calculated?

The formula is: Swap = Lot Size × Contract Size × Swap Rate (in points) / 10

When the swap day falls on the broker's triple swap day (usually Wednesday to cover the weekend that the interbank market is closed), the swap charged is 3× the normal daily rate.

Positive vs. negative swap

Swap can be a cost or a credit depending on:

  • The interest rate differential between the base and quote currency
  • Whether you are long or short the pair
  • Your broker's mark-up or mark-down on the rate

Carry traders deliberately seek pairs with a positive swap to earn overnight income. However, swap rates can change, especially around central bank decisions.