Mortgage Calculator
Doesn’t get much simpler than this. You move the sliders and it tells you how much you will pay each month.
It’s a really basic plugin but has lots of opportunity to add more features and outputs.
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.