We read every message. Use the email below for tool suggestions, formula corrections, or partnership and advertising inquiries. This is a static site, so there is no contact form that stores your data.
Email: [email protected]
What to include
- Tool suggestion - tell us the trade and the inputs you wish you could enter.
- Correction - if a formula or assumption looks wrong, link the page and describe the issue.
- Advertising / partnership - we consider direct, relevant sponsorships only (no intrusive networks by default).
We typically reply within a few business days. Because the site runs calculations locally, we never receive your inputs - only what you choose to write to us.