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Contact Us
Questions, feedback, bug reports or a calculator you'd like us to add — we read every message.
Email us
The fastest way to reach us is by email. Click a link below to open your mail app:
- General & feedback: [email protected]
- Report a bug or wrong result: [email protected] (please include the page URL and the numbers you entered)
- Request a new calculator: [email protected]
- Privacy & data requests: [email protected]
What to include
For bug reports, telling us the page you were on, the values you entered and the result you expected helps us fix things quickly. Because calculations run privately in your browser, we can't see what you typed unless you tell us.
Response time
We're a small project, so please allow a few business days for a reply. Privacy and data-rights requests are prioritised and handled within the timeframes required by applicable law.
More information
Learn how the site works on our About page, or read how we handle cookies and advertising in our Privacy & Cookie Policy.