Automatically translates all sites from American/old British units to International System of units (SI/Metric) - adding converted unit in a bracket behind original units. Example: 10 feet 🠚 10 feet【𝟯 𝗺】 ​Convenient for shopping, cooking, etc. (You can also use Alt+M for manual conversion of the page) Inch, Feet, Yard, Mile -> Metre (Meter) Pound, Ounce, Stone -> Kilogram Gallon, Quart, Pint, Fluid Ounces, Cups -> Litre (Liter) mpg -> L/100 km mph -> km/h Fahrenheit -> Celsius/Kelvin Area conversion for ft, yd, in, mi, both as "sq. ft" and "ft²" (must not be superscript); the same is for volume conversion. Supports Amazon, Ikea, and other formats: 10" x 20" x 3" will be converted and replaced with metric units Combo units also supported: 1 ½″​【𝟯,𝟴 𝗰𝗺】 or 2’−4″​【𝟳𝟭 𝗰𝗺】 Features most possible ways these units are written with dashes, quotes, apostrophes, Unicode units, etc. Toolbar button to turn extension ON/OFF globally You can keep it off and just run when needed by pressing Alt+M Permission to read page data is required to be able to change units. Permission to storage is required to save settings. Don't forget to check Options page. Not working on a specific site? Have a suggestion for improvement? Send me an email with details. Source code is here https://github.com/m1l/Everything-Metric Disclaimer: Author is not responsible for any damages, including cakes that are too sweet, because of miscalculation or any other issues.