Contact.

Questions, bug reports, feature requests, partnerships — drop a note and we’ll read it. One person runs this, so replies may take a few days.

// WHAT WE’D LOVE TO HEAR

• Bug reports. Wrong answer, broken link, weird layout — whatever you found, we want to know.
• Feature requests. A tool you wish existed? A calculation you can’t find anywhere else? Tell us.
• Data corrections. Density tables, formulas, definitions — if a number is off, we’ll fix it.
• Accessibility issues. Anything that isn’t usable with a keyboard or screen reader is a bug we want to fix.

// WHAT WE CAN’T DO

• Answer “what’s my BMI / tip / mortgage” by email — the tools do that better.
• Provide professional medical, financial, tax, or legal advice. Our tools are informational.
• Sell, lease, or rent user data. There isn’t any to sell.