This update is long overdue.
The world of web pages has grown smaller over the years. That is, web pages are increasingly geared toward hand-held devices like phones and tablets. The design I had for so long was still targeted at desktop screens.
I published a new responsive design of the amortization calculator pages which now scale better for smaller screen sizes. For now, the color scheme is mostly the same, and the calculations themselves should not be affected. I hope you’ll not notice any serious change in behavior.
But it’s always possible that I messed something up along the way, so if something breaks for you, or if some formatting seems particularly wonky, please let me know!