I can't add the calculation filed to the Thank you page. Please help

Is there another way to do this? Among the form fields that the thank you page lets me add, I can't add the calculation filed that I already calculate inside my form. 

I am not sure if I understand your query correctly. Do you mean to say that you can't add the calculated field on your form to the Thank you page? Could you provide us with more information along with a screenshot on this thread so that we can further assist you?

We will wait for your response. Thank you!