Sweet Rice Flour: why 120 g per cup is wrong
King Arthur Baking ingredient weight chart publishes 120 g per US cup of sweet rice flour. This site rejects that figure and publishes 160 g instead, from Koda Farms Blue Star Mochiko Sweet Rice Flour (nutrition label) (density 0.6763 g/mL, matching the composition of the substance). The reason:
King Arthur's 120 g/cup figure is 33% below the multi-source producer convergence at 160 g/cup (Koda Farms, Bob's Red Mill, USDA Branded Foods). Same fluid-ounce-based measurement error pattern as their regular rice flour entry, which was similarly corrected from 142 g/cup to 160 g/cup. KA appears to have assumed sweet rice flour packs like AP flour (both listed at 4 1/4 oz per cup), but sweet rice flour is milled finer and its nearly-pure amylopectin starch composition produces denser packing.
The arithmetic
| Source | 1 cup | Density | Status |
|---|---|---|---|
| King Arthur Baking ingredient weight chart | 120 g | 0.5072 g/mL | Rejected on physics |
| Koda Farms Blue Star Mochiko Sweet Rice Flour (nutrition label) | 160 g | 0.6763 g/mL | Published here |
The published figure and its sources
The full sourcing for sweet rice flour, 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.
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