This was quite a fun project. You set the loan amount and the number of installments you want to make and it calculates how much you will pay. You can then change the date of the first payment and the repayment info updates. The link at the bottom of the form summarizes all the loan details. The button takes you off to wherever the loan application is processed.
This is set up for a client so their interest rates may not be the same as yours. But it’s all easily editable of you want something different.
If you want a version like this please contact me.
Note that these plugins are not free. The cost depends on the complexity of the plugin and what changes you need doing.