The calculation of credit card installment fees is usually based on the following factors:

1. Number of installments: Installment fees are usually charged for each installment period, so the installment period The higher the number, the higher the total fee.

2. Consumption amount: The calculation of handling fee is usually based on a certain proportion of the consumption amount. For example, the handling fee is charged according to 1 or 2 of the consumption amount. The higher the consumption amount, the higher the handling fee.

3. Policies of credit card issuing banks: Different banks have different policies on installment fees, and may use fixed rates or tiered rates to calculate handling fees.

To sum up, the credit card installment fee is calculated based on a certain proportion of the consumption amount, and the number of installments will also affect the total fee.

Extended information:

In addition to handling fees, some banks also charge other fees for credit card installment business. For example, some banks may charge a certain percentage of insurance fees in the first installment to ensure the safety of repayment in installments. In addition, some banks may also charge an early repayment fee when settling an installment early. Therefore, when choosing a credit card installment business, in addition to handling fees, you should also pay attention to other possible charges.

In addition, it should be noted that different banks may have different regulations on credit card installment fees. It is recommended that you consult the relevant bank to obtain accurate information and fee calculation methods when performing credit card installment operations.

Finally, if you do not provide specific information in your question, such as the number of installments, consumption amount, etc., I will not be able to give an exact answer. Please make sure to provide enough information so that I can provide you with a more accurate answer.

The above is the general calculation method and related instructions for credit card installment fees. Hope this helps!