Free Cups to Grams Converter
Convert cups to grams for specific ingredients with accurate density-based weights.
What is a cups to grams converter?
A cups to grams converter is a free online tool that instantly converts volume measurements like cups and tablespoons to accurate weight in grams for any specific ingredient. It accounts for each ingredient's unique density so you get precise, repeatable measurements every time — no signup needed.
The reason this matters is that a cup of all-purpose flour weighs 125 grams, but a cup of honey weighs 340 grams — they are completely different. I have seen recipes fail because someone assumed all cups weigh the same. Professional bakers have known for decades that weight measurements eliminate the 20% variance you get from scooping flour differently, and this converter brings that precision to your home kitchen.
How it works
Each ingredient in the converter has a known gram-per-cup density stored in the calculator. When you select an ingredient and enter the number of cups, the calculator multiplies the volume by the ingredient's specific density to produce the weight in grams. For example: you select all-purpose flour (density 125 g/cup), enter 2.5 cups, and the calculator returns 312.5 grams. If you select granulated sugar (density 200 g/cup) with the same 2.5 cups, you get 500 grams — a very different weight for the same volume. You can also enter tablespoons as a secondary input (one cup equals 16 tablespoons). The same density-based multiplication applies. A visual bar chart compares the weight of your selected amount with other common ingredients at the same volume, so you can see how dramatically densities vary across ingredients.
When to use a cups to grams converter
Use this tool any time you are following an American recipe that measures in cups but you prefer to bake by weight — which you should, because weight is consistently more accurate. European and Australian recipes almost exclusively use grams, so convert American cup-based recipes when adapting them to a scale. This is especially critical for baking, where the difference between 120g and 140g of flour can turn a fluffy cake into a brick. I use this converter most often for flour, brown sugar (which is particularly tricky because it is measured packed vs unpacked), and butter. The converter handles 20+ common ingredients, including cocoa powder, honey, oats, and nuts. Meal preppers and macro counters also use it to convert recipe volumes to gram weights for accurate nutrition tracking.
Common mistakes when converting cups to grams
The most common mistake I see is assuming all dry ingredients have the same cup-to-gram ratio. All-purpose flour is 125 g/cup, but whole wheat flour is 130 g/cup, cake flour is 120 g/cup, and coconut flour is a completely different 112 g/cup. Using a generic 'one cup equals 120g' rule for everything will give you wrong results for most ingredients. The second mistake is not accounting for how ingredients are packed. Brown sugar measured 'packed' can weigh 25% more than unpacked. The same applies to cocoa powder and flour — spooning vs scooping changes the weight significantly. Always use the spoon-and-level method for flour unless the recipe specifies otherwise.
How to use this calculator
- Select your ingredient — Choose from a list of common baking and cooking ingredients.
- Enter the cup amount — Input the number of cups (including fractions like 1.5 or 2.25).
- Get the gram weight — The exact gram equivalent appears instantly, tailored to that ingredient.
Frequently asked questions
How many grams is 1 cup of all-purpose flour?
1 cup of all-purpose flour weighs 125 grams. Sifted flour is lighter at about 110g per cup. Whole wheat flour is about 130g per cup. The weight differs because of density — cocoa powder (100g/cup) is much lighter than honey (340g/cup). Always weigh flour for best baking results.
How many grams is 1 cup of butter?
1 cup of butter is 227 grams (2 sticks). Butter is one of the few ingredients where 1 cup consistently equals 227g across brands. This makes butter easier to convert than flour or sugar. For melted butter, the weight is the same but the volume is slightly less.
Is a cup measurement the same in every country?
No. A US cup is 240ml (8 fl oz). A UK/imperial cup is 284ml (10 fl oz). An Australian cup is 250ml. The metric cup (250ml) is used in most Commonwealth countries. The converter uses the US standard (240ml) — if you're using a different standard, adjust by the ratio.
Why does my recipe need grams instead of cups?
Weight measurements are more accurate than volume. A cup of flour can vary from 110g to 150g depending on how it's scooped and sifted. Professional bakers always use grams because 125g of flour is always 125g — no variation. The difference can ruin a recipe, especially for bread and pastry.
How many grams is 1 cup of sifted flour vs unsifted?
1 cup of unsifted all-purpose flour weighs 125g. Sifted flour weighs about 110g per cup because aeration increases volume. The difference matters: if a recipe calls for sifted flour and you use unsifted, you add roughly 15% more flour. Always follow the recipe's scooping instruction — spoon-and-level for most baking, scoop-and-sweep for bread flour.
Can I convert grams back to cups using this tool?
Yes — enter a gram value in the grams field and the tool auto-calculates the cups and tablespoons in reverse. Note that converting grams to cups introduces rounding error because cup measurements are less precise than weight. For example, 250g of all-purpose flour is exactly 2 cups, but 250g of brown sugar is about 1.14 cups due to different densities.