The swap formula for all forex instruments, including gold and silver, is the following:

lots * long or short positions * point size

Here is an example for EUR/USD:

The client base currency is USD.
1 lot buy of EUR/USD.
Long position = -3.68
It is a buy position, therefore the system will take the swap rate for the long position, which currently is -3.68.
The point size = contract size of a symbol * minimum price fluctuation.
The EUR/USD point size = 100 000 * 0.00001 = 1.
If we apply the given numbers in the formula, it will be 1 * (-3.68) * 1 = -3.68 USD.
This means that 1 lot buy EUR/USD, if the position is left overnight, the swap calculation for the client will be -3.68 USD.

Here is an example for gold:

The client base currency is USD.
1 lot buy of Gold.
Long position = -2.17
It is a buy position, therefore the system will take the long points, which currently is -2.17.
The point size = contract size of a symbol * minimum price fluctuation
The Gold point size = 100 * 0.01 = 1
If we apply the given numbers in the formula, it will be 1 * (-2.17) * 1 = -2.17 USD.
So for 1 lot buy gold, if the position is left overnight, the swap calculation for the client will be -2.17 USD.

Please note that if the deposit currency of the trading account is in EUR (like in the examples above), the swap calculation will be converted from USD to EUR. The result of the swap calculation is always the secondary currency in a symbol, and the system converts it to the base currency of the trading account.

The examples provided only serve as a guide and do not reflect the current charges.