Buckle up for a nerd nugget. In countries that use the metric system, 2/3 of a US cup is about 158 milliliters.
One metric cup? That’s 250 ml. So 2/3 of a US cup is roughly 63% of a metric cup. Close, but no cigar.
How To Get 2/3 Cup With 1/4 Cup | Detroit Chinatown
This means if you’re baking a recipe from the US with a metric measuring cup, you might accidentally add too much. It’s a tiny difference—but it can make your cake fall flat. Literally.
How to Measure It Without Looking Crazy
Pour water into a standard 1-cup measure. Stop at the 2/3 line—usually marked with a little “2/3” or a dotted line.
If your cup only has lines for 1/4 and 1/3, you can play a game: fill it to the 1/3 line twice. That’s two 1/3 cups, which equals 2/3 of a cup. Mind blown?
Or use a 1/4 cup measure. Three of those make 3/4—too much. So use two 1/4 cups (that’s 1/2 cup), then add 2 tablespoons and 2 teaspoons. You’re basically a kitchen wizard now.
