[wickedsight]

> How confident is the OP that every single one of these 60 calculators work all the time, with all edge cases?

The compound interest calculator, which is their 'favorite page', already shows an incorrect value in the graph. So my faith in the other calculators isn't great. I also kinda doubt OP's story of them using that page all the time, since it took me about 20 seconds to find this issue.

[BeetleB]

Can you provide details on the bug?