Contact and Corrections

Reporting an error

Please include the page, the numbers you entered and the result you expected. Copy the page link with the “Copy link” button so we can see exactly what you saw. We check every report against the sources on the methodology page and record fixes in its changelog.

Suggesting a calculator

Tell us what you are trying to work out and what you know at the start. New tools are added when they calculate something the existing ones cannot.

What we cannot help with

We cannot check individual patterns or kits from shops, or answer questions about orders placed elsewhere.