Metric McMaster

Converts imperial units to metric on McMaster-Carr and toggles tooltips via toolbar button.

Metric McMaster automatically converts imperial units to metric as you browse McMaster-Carr product pages. Unlike general converter extensions, Metric McMaster is designed around the formatting and measurement styles used on the McMaster website, helping provide accurate conversions where generic tools may miss values. When you visit mcmaster.com, the extension detects imperial measurements and displays their metric equivalents in tooltips. Hover over a converted value to see its metric conversion, or toggle persistent conversion tooltips with the extension toolbar button or Alt+X. Tooltip rows can also be clicked to copy the raw metric number. This extension is useful for engineers, students, and anyone who prefers metric units when sourcing parts, making it faster to read product specifications without manual calculations or switching tabs.