Recipe Converter Calculator
Oven Temperature Conversion
Volume Conversion
NIST Metric Kitchen

The National Institute of Standards and Technology (NIST) website has helpful
cooking and baking tips plus a bunch of tasty metric recipes.
Grams Are More Consistent
The density of an ingredient can vary significantly based on processing and
compaction.
This variation causes notable inconsistencies when measuring by cups and
tablespoons.

For example, some forms of salt are more than twice as dense as other forms.
A 1/4 cup of popcorn salt can contain double the salt of a 1/4 cup of coarse sea
salt.
Likewise, 1 cup of pressed brown sugar is about a third more sugar than 1 cup of
loose brown sugar.
Weighing in grams gives you better accuracy and predictability so that variations of
ingredient processing and compaction don't botch up your recipe.

Of course, the real reason that the best chefs prefer metric recipes is that weighing
ingredients in a single mixing bowl using the scale's tare function means less mess and
less cleanup.
Open Source
The Recipe Converter Calculator is an Open Source community project.
Data for the calculator is on GitHub in the file:
ingredients-db.js
ingredients-db.js
You can get involved by submitting an issue or PR (pull request) on GitHub or by posting
a suggestion to the r/ThinkMetric sub on
Reddit.
If you post to Reddit, add the
Food, Recipes & Grams
flair.