Marshmallow Creme: why 123 g per cup is wrong
King Arthur Baking Ingredient Weight Chart publishes 123 g (4.3 oz) per US cup of marshmallow creme. This site rejects that figure. The sources it accepts put a cup at 96–104 g (3.4–3.7 oz), and it publishes that range rather than a single figure. The reason:
Store-bought marshmallow spread is the same corn syrup, sugar and egg-white foam as Fluff, and the jar labels weigh 2 tablespoons at 12 or 13 g, 96-104 g per cup, in line with Durkee-Mower's slightly more than 3 oz per cup. 123 g per cup is 0.52 g/mL, 18-28% heavier than the labels. A level cup reaches that only if the foam is pressed and partly collapsed. King Arthur's chart lists the same product a second time, as Marshmallow Fluff, at 128 g.
The arithmetic
| Source | 1 cup | Density | Status |
|---|---|---|---|
| King Arthur Baking Ingredient Weight Chart | 123 g4.3 oz | 0.5199 g/mL | Rejected on physics |
| Accepted sources (4) | 96–104 g3.4–3.7 oz | 0.4058–0.4396 g/mL | Published as a range |
The published figure and its sources
The full sourcing for marshmallow creme, including every accepted and rejected figure, the state or filling method behind each, and the physics or standards reasoning applied, is on the ingredient page.
SwapGenie
Scan a grocery barcode, get a better version of the same thing.
We built SwapGenie for the problem this site cannot solve: the label. It reads a barcode, scores the product against your own allergens and diet rather than a generic grade, and suggests what to buy instead. On Android now; iOS on February 15, 2027.
Coming February 15, 2027