Cups to Grams Converter
Ingredient by ingredient, because a cup of flour and a cup of honey don't weigh the same.
Sources disagree on flour, and it matters. This tool uses King Arthur Baking's ingredient weight chart, which gives 120 g per cup of all-purpose flour. America's Test Kitchen gives 140 g. Google's answer box currently shows 125 g. That spread is roughly 17 percent, enough to change a cake. How you fill the cup matters more than which chart you pick.
How this converter works
There is no single formula here, because cups measure volume and grams measure weight. The conversion depends entirely on the density of what is in the cup. A cup of honey weighs almost three times what a cup of cocoa powder does.
The grams-per-cup figure for each ingredient comes from King Arthur Baking's ingredient weight chart. The secondary ounce output uses the exact avoirdupois ounce of 28.349523125 grams, per the NIST Guide to the SI, Appendix B.
Results are rounded to the nearest gram. Rounding further would imply a precision that cup measurement doesn't have.
Full ingredient chart
Weights in grams, from King Arthur Baking.
| Ingredient | 1/4 cup | 1/3 cup | 1/2 cup | 3/4 cup | 1 cup |
|---|---|---|---|---|---|
| all-purpose flour | 30 | 40 | 60 | 90 | 120 |
| bread flour | 30 | 40 | 60 | 90 | 120 |
| cake flour | 28 | 38 | 56 | 85 | 113 |
| granulated sugar | 50 | 66 | 99 | 148 | 198 |
| brown sugar (packed) | 53 | 71 | 106 | 160 | 213 |
| powdered sugar | 28 | 38 | 56 | 85 | 113 |
| butter | 57 | 76 | 114 | 170 | 227 |
| milk | 57 | 76 | 114 | 170 | 227 |
| water | 59 | 79 | 118 | 177 | 236 |
| vegetable oil | 50 | 66 | 99 | 148 | 198 |
| cocoa powder | 21 | 28 | 42 | 64 | 85 |
| rolled oats | 21 | 28 | 42 | 64 | 85 |
| honey | 85 | 113 | 170 | 255 | 340 |
| chocolate chips | 42 | 57 | 85 | 128 | 170 |
Why weighing beats measuring
A kitchen scale removes the whole problem. Weigh 120 g of flour and you get 120 g every time, regardless of how packed the bag is or how you hold the cup. For bread and pastry, where hydration ratios matter, that consistency is the difference between a repeatable recipe and a guess.
For a stew or a soup, none of this matters much. Use the cup.
Common questions
How many grams is 1 cup of flour?
King Arthur Baking gives 120 grams for one cup of all-purpose flour. Other reputable sources differ: America's Test Kitchen gives 140 grams, and Google's own answer for this query currently shows 125 grams.
Why do sources disagree on the weight of a cup of flour?
Because scooping compresses flour and spooning it in doesn't. A cup filled by dipping the cup into the bag can hold noticeably more than a cup filled by spooning flour in and levelling it off. Neither method is wrong; they are just not standardized.
Is 250 grams equal to 1 cup?
Only for a dense ingredient. 250 grams is roughly 2 cups of all-purpose flour, or a little over 1 cup of honey. Cups measure volume and grams measure weight, so the answer depends on what is in the cup.
Does this work for liquids?
Yes for water and milk, which are included in the ingredient list. For other liquids the density differs, so use a measuring jug rather than converting.
Related converters and guides
Sources
- Ingredient Weight Chart. King Arthur Baking. Source for every gram weight on this page, including the 120 g per cup of all-purpose flour used by the converter.
- America's Test Kitchen gives 140 g per cup of all-purpose flour. Reported figure, cited here as a point of disagreement rather than as the value the converter uses.
- Google AI Overview for "cups to grams", observed August 2026, showed 125 g per cup of flour. AI Overview content changes frequently.
- NIST Guide to the SI, Appendix B: Conversion Factors. National Institute of Standards and Technology. Source for the ounce and gram definitions used in the secondary output. NIST prints exact factors in boldface and rounds the rest to the digits shown, which is the convention this site follows.