Free, no sign-up, one line of HTML. Cups to grams for nine common baking ingredients, using real density data, not "just treat everything like water."
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Recipe blogs live and die by trust, and "1 cup flour = 120g, always" is close enough for most readers but wrong enough to matter if you're precise about it. This widget uses the same ingredient-density figures as the main UnitMojo converter, sourced from King Arthur Baking's own published chart, not a generic water-equals-everything assumption.
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Cups, tablespoons, and teaspoons, for: all-purpose flour, granulated sugar, brown sugar (packed), powdered sugar, butter, unsweetened cocoa powder, honey, milk, and water. Works in both directions (volume to grams, or grams back to volume).