Hello Pankaj,
Thank you for your question. I'm sharing Azure data factory pricing document link for your reference which has cost details for each activity along with unit of metric to determine how the charges are calculated. : https://azure.microsoft.com/en-us/pricing/details/data-factory/data-pipeline/
Furthermore, you can leverage azure pricing calculator and search for data factory to create, save, and share cost estimates or create your budget.
Regards,
Divya.