Contact us
We'd love to hear from you — whether it's a math error you caught, a calculator you wish existed, a partnership idea, or general feedback.
Email: [email protected]
What are you writing about?
Math errors
Include the calculator name, the exact inputs you entered, the result you got, and what you expected. Screenshots help. Verified fixes usually ship within days.
Calculator requests
Tell us what you need to calculate and why — real use cases get built faster than generic ideas. Several existing calculators started as reader requests.
Content corrections
Spotted an outdated guide or a confusing explanation? Point us at the page and we will rework it.
Business & partnerships
Advertising, sponsorships, bulk licensing, or data partnerships — put “business” in the subject line so it routes correctly.
Response times & your privacy
We read every message and typically respond within a few business days. If your message is about a calculation bug, expect a reply once the fix ships.
Emails you send are used only to respond to you — never added to a marketing list, never sold, never shared. See our privacy policy for the full picture.
— Kevin Butler, founder, Calqura