Get in touch

Found a wrong number, a broken layout, or a code reference that doesn't match your jurisdiction? That's exactly the mail we want. Fill in the form and we'll reply to your email, usually within a few days.

What to include

• Calculation issues: the mode (Basic/Advanced), your inputs with units, and the value you expected.
• Code questions: your jurisdiction. We reference the IRC; local amendments differ and we can't give binding code advice.
• Feature requests: what you were trying to build when you hit the limit.