Metric Cooking

Metric Cooking

Annotates US cooking units with their metric equivalent (e.g. 1 3/4 cups sugar [350 g])

What is Metric Cooking?
Metric Cooking is a Firefox add-on that provides annotations for US cooking units, such as cups and tablespoons, with their corresponding metric equivalents. It also converts volumes to weights for precise measurements. With this add-on, you can easily convert and accurately measure ingredients in recipes using your kitchen scale.
Users: 255 ▼ -1
Rating: 4.30 (10)
Version: 1.7 (Last updated: 2022-06-25)
Creation date: 2016-08-07
Weekly download count: 6
Firefox on Android: Yes
Risk impact: Moderate risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
  • *://*/*
Size: 24.14K
URLs: Website
Stats date:

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Do you have no idea what "a stick of butter" is, or how to measure "a cup plus two tablespoons"? This add-on provides a button that when pressed, annotates US cooking units with their metric equivalent, while also trying to convert from volumes to weights, such that you can simply use your kitchen scale. Examples, where the part in [] would be added by this add-on:

I used about 1/4 to 1/3 of a cup [60–80 ml]
3/4 cup plus 2 tablespoons packed light-brown sugar [190 g]
1 1/2 sticks chilled unsalted butter [175 g]
a tablespoon of heavy cream [15 g]
2/3 cup freshly grated Parmigiano-Reggiano [65 g]
sides about 2 1/2 to 3 inches [6.5–7.5 cm] high
¾ cup plus 2 Tbs sugar [175 g]
mandoline set to 1/16th of an inch [2 mm].
a 5- to 6-quart [4.75–5.75 l] heavy pot
between 12 ounces and a pound [350–450 g]
at about 350-380 degrees (F) [175–195 °C]
Butter a 13- by 9- by 2-inch [32.5×22.5×5 cm] baking pan

If a recipe page is not annotated properly, please open a new issue at and provide the address of the web page (you'll need a github account). I will then try to fix it.

User reviews
It works just fine for converting US measurements to metric, but I need the opposite. Someone please work on that for us.
by MissChris, 2023-10-11
View all user reviews
Risk impact

Metric Cooking may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.

Risk likelihood

Metric Cooking has earned a fairly good reputation and likely can be trusted.

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