Convert cups into an estimated ingredient weight, or translate grams into cups when a scale is unavailable. Select both the ingredient and the cup convention: neither can be inferred reliably from the word “cup” alone.
How to use the two directions
Choose Cups to grams for a volume listed in a recipe, or Grams to cups for a known weight. Enter the amount, choose the cup size, and select the ingredient. Open the options for a different rounding level, a recipe multiplier, or your own density in g/mL.
A cup marked 250 mL should use Metric cups, while a 240 mL cup has a separate option. The imperial option represents a historical half-pint cup and should not be assumed for every modern British recipe.
Flour, sugar, and packing
A cup of flour is much lighter than a cup of granulated sugar. Scooping flour directly from a bag can also pack more into the cup than lightly filling and leveling it. Brown sugar and powdered sugar have separate presets because their texture and packing instructions differ.
Examples
One and a half cups of flour
Using the all-purpose flour preset and US customary cups, 1 1/2 cups is approximately 180 g. In reverse, 180 g is approximately 1.5 US cups under the same assumption.
The same cup filled with white sugar
With white granulated sugar selected, 1 1/2 US cups is approximately 297 g. A universal rule of “one cup equals 240 grams” would be incorrect for both this example and the flour example.
Formula
Grams = cups × cup volume in mL × ingredient density
Cups = grams ÷ (cup volume in mL × ingredient density)
The selected recipe multiplier scales the entered amount before conversion. Reference-table rows use a multiplier of one.
How precise is the answer?
The decimal places describe the calculation, not the certainty of the ingredient weight. Use the recipe author's stated gram amount when available, and keep preparation consistent: sifted and unsifted ingredients, packed sugar, and chopped ingredients need different references.
Reference weights
The flour and sugar presets use King Arthur Baking’s ingredient weight chart, with the chart's cup references normalized here to a US customary cup. Other cup sizes scale by volume. NIST’s household measurement guidance provides household volume context. Use Custom density when a recipe or ingredient supplier provides a more appropriate reference.