Contact

• Bug reports — something looks broken or a result seems wrong.
• Corrections — a mistake in a guide, a calculator page or a translation (the site is available in 16 languages).
• Ideas — a calculator or guide you would find useful.
• Embedding — questions about putting the free calculator widget on your own site.

For a bug or a wrong result, please include the page link — after a comparison, the address bar contains the prices and sizes you entered, so I can see exactly what you saw — plus your device and browser (for example, "iPhone, Safari").

I read every message and usually reply within a few working days. Bug reports and corrections get priority.

Your email address is used only to reply to you. See the Privacy Policy.