American recipes measure in cups, European recipes measure in grams, and converting between them trips up even confident bakers. The trap is that a cup is a volume, not a weight. A cup of flour weighs about 120 grams, a cup of granulated sugar about 200 grams, and a cup of honey about 340 grams. Using one generic conversion for every ingredient ruins recipes, because the same cup can hold nearly three times as much honey as flour. This converter uses a separate weight for each ingredient.
The ingredient table covers the twelve baking staples you will meet most often. Flour and powdered sugar sit at 120 grams per cup, cocoa powder is lighter at 100, and rolled oats lighter still at 90. Granulated sugar is 200, brown sugar packs denser at 220, and butter is 227, which is why a cup of butter equals two standard sticks. Liquids cluster near water at 236 grams per cup, with milk at 245 and oil slightly lighter at 218. Honey is the outlier at 340, because it is far denser than water.
Measuring technique changes the result, especially for flour. Scooping the cup straight into the flour bag packs the flour down and can add 20 percent or more to the weight, which makes cakes dense and dry. The better method is to spoon flour loosely into the cup and level it off with a knife, which lands close to the table value of 120 grams. Brown sugar is the opposite: most recipes mean it packed firmly into the cup, which is how it reaches 220 grams. Knowing which method your recipe expects matters as much as the number.
Here is a worked example. A recipe calls for 2 cups of flour, 1 cup of granulated sugar and half a cup of butter. The flour converts to 240 grams, the sugar to 200 grams, and the butter to about 114 grams. In ounces, the flour is about 8.5 ounces, the sugar about 7.1, and the butter about 4.0. If you had used a generic 240 grams per cup for everything, you would have added double the flour and nearly double the sugar, and the cake would have failed before it reached the oven.
Baking is far less forgiving than cooking when conversions go wrong. A soup can absorb an extra spoon of salt or a missing spoon of rice without disaster, but a cake depends on ratios: flour gives structure, sugar gives moisture and tenderness, fat gives richness, and leavening lifts the whole thing. Changing one ingredient by 20 percent shifts the balance of all the others. That is why professional bakers weigh everything in grams and why converting carefully, ingredient by ingredient, is worth the minute it takes.
If you bake often, a kitchen scale is the single best purchase you can make. It removes cups entirely, works for every ingredient without a table, and lets you follow recipes from any country without converting. Until then, this converter bridges the gap: keep it open beside the recipe, convert each ingredient separately, and write the gram weights on the recipe card for next time. After a few bakes you will remember the common ones by heart, starting with flour at 120 and sugar at 200.
Use this tool for any recipe that mixes cups and grams, or for scaling a recipe up or down. Halving a recipe is easy in grams but awkward in cups, since a third of a cup is hard to measure cleanly. Convert first, then halve or double the gram weights, and the scaled recipe stays exact. Keep the note about scooping versus spooning in mind, measure brown sugar packed and flour spooned, and your converted recipes will taste like the originals they came from.