I will install Excel made LOAN Credit calculator planner for you

It is Excel made workbook with two sheets, one for entering data inside and other sheet is automatically generated with detailed payment plan. On first sheet you can choose amount of loan, interest, credit duration and period for credit installments are made.

On other sheet there is payment plan you print for further references.
There are some limitation in regarding of period (30 years), amount (350000 $), but this can be easy adopted on user interest. Also currency is set on $, but this can be easy changed.

This template can be adopted with specific requirements, but this should be discussed and agreed.

It is made so far for Windows, not tested for Mac.