"The main Navigation tabs at top of each page are Metric versions of Calculators. If there's an Imperial version, directly under the main tab is a smaller 'Impe

"The main Navigation tabs at top of each page are Metric versions of Calculators. If there's an Imperial version, directly under the main tab is a smaller 'Imperial' tab for the Feet and Inch version" I think I'm too dumb to switch it to metric or I miss something.