Metric McMaster

Name: Metric McMaster
Rating: 5 (2 reviews)
Author: Kevin

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

As of June 2026, Metric McMaster has 84 users and a 5.00/5 rating from 2 reviews in the Productivity category.

Kevin Productivity

Chrome Web Store ↗.crx

Users+61.5%

Rating0%

5.00

2 reviews

Reviews+100.0%

Version

1.1.1

Manifest V3

90-day change · In the last 90 days this extension 1 version update.

History

6 snapshots

Tracking since Apr 20, 2026.

View as table

Date	Users	Rating	Reviews	Version
Apr 20, 2026	52	5.00	1	1.0
May 6, 2026	59	5.00	1	1.0
May 17, 2026	68	5.00	1	1.0
May 30, 2026	77	5.00	1	1.0
Jun 5, 2026	78	5.00	2	1.1.1
Jun 14, 2026	104	5.00	2	1.1.1
Now	84	5.00	2	1.1.1

Changelog

May 30, 2026

description

Metric McMaster automatically converts imperial units to metric as you browse McMaster-Carr product pages. Unlike other converter extensions, Metric McMaster is specifically designed to handle the unique formatting and measurement styles used on the McMaster website, ensuring accurate and reliable conversions where other tools fail.

When you visit mcmaster.com, the extension detects measurements in inches, feet, pounds, and Fahrenheit, and displays their metric equivalents directly on the page. Simply hover your mouse over any imperial unit to see its metric conversion as a tooltip. You can toggle these helpful tooltips on and off at any time by clicking the extension’s toolbar button. This extension is ideal for engineers, students, and anyone who prefers to view metric units when sourcing parts, making it easier and faster to understand product specifications without manual calculations or switching tabs.

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.

Permissions & access

Permissions: activeTab
Host access: https://*.mcmaster.com/*, https://mcmaster.com/*

Screenshots

About

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.