Contact Us
I read every message that comes in, so please don’t hesitate.
Whether the calculator has given you a number that looks wrong, you want a feature that isn’t there yet, you’re curious about how one of the formulas works, or you need to reach me about a privacy or business matter — this is the place. Prefer a form? Fill this in and I’ll reply to the address you give me.
How quickly I’ll reply
Usually within 2–3 business days. Reports of calculation errors jump the queue and I try to look at those within 24–48 hours. If a week goes by with no reply, check your spam folder and then send it again, messages do occasionally vanish.