Thanks to interest from readers and responders like you, I have had a lot more opportunity to check my original work and the calculator is holding up quite well under public scrutiny. Thanks to everyone who gave feedback or wrote notes of congratulations – it’s made this whole project really, really fun!
Right after launch, I started collecting voluntary feedback from people using the calculator. Originally, I simply asked people to rate the calculator on a 1-5 scale. Here are the results from the first 1,338 respondents (before I switched the feedback system to the present one, which is still collecting data).