Arborio Rice

One US cup of arborio rice weighs between 180 and 212 grams, depending on how the cup is filled and which source measured it. That range is the answer; a single number would not be. Every figure behind it is below, with the method each source used.

Also called arborio, arborio rice, risotto rice, italian risotto rice, oryza sativa arborio.

Arborio rice packs at 180-212 g per US cup with a real ~18% spread between US-grown "arborio-style" brands (~180 g/cup) and imported Italian arborio (~208-212 g/cup). USDA's medium-grain white rice reference sits in the middle at ~195 g/cup, and no single figure represents both commercial clusters.\n\nArborio is a short-to-medium-grain Italian rice cultivar (Oryza sativa var. Arborio), named after the town in the Vercelli province where it was developed in the 1940s.

Its defining characteristic is high amylopectin content — a starch fraction that gelatinizes and releases as viscous surface starch during slow cooking, giving risotto its characteristic creaminess. For this reason arborio is deliberately not rinsed before cooking (unlike basmati or jasmine): the surface starch is a feature, not a contaminant.\n\nThe measurement data splits into two clusters. US-grown arborio-style brands (Lundberg, RiceSelect, Signature Select, H-E-B) show 45-47 g per 1/4-cup serving, extrapolating to 180-188 g per cup.

Italian imports (DeLallo, Village Harvest) show 52-53 g per 1/4-cup, extrapolating to 208-212 g per cup. USDA's SR Legacy "Rice, white, medium-grain, raw, unenriched" (FDC 169760, formerly NDB 20450) sits between them at 206 g per metric cup (approximately 195 g per US cup, density 0.824 g/mL). An additional aqua-calc branded record (UPC 085239406663) matches USDA at 211 g per metric cup (200 g per US cup).\n\nThe US-vs-Italian split appears to be genuine product identity variance rather than measurement noise alone.

US-grown "arborio-style" rice from California, Louisiana, and Texas may be a US medium-grain cultivar (Calrose type or similar) grown under different climate and processing conditions than the true arborio landrace cultivated in northern Italy's Po Valley. FDA nutrition-label rounding rules explain some of the spread — a declared 45 g quarter-cup could actually weigh 43-47 g — but the 8 g gap between Lundberg's 45 g and Village Harvest's 53 g exceeds what rounding alone accounts for. Grain size and moisture content at packaging both plausibly contribute.\n\nPhysically, arborio is denser than long-grain white rice (~185 g/cup per USDA) because its short, plump grains nest into cup volume with less inter-grain void space.

Longer grains sit at oblique angles and leave more air gaps; shorter grains pack more efficiently. Arborio's density falls between long-grain white rice and true short-grain sushi rice (~215-225 g/cup per Japanese-cup measurements). Sushi rice grains are even shorter and stubbier than arborio, packing tighter still.\n\nFor validation and internal consistency, this entry withholds a single figure and publishes the observed range 180-212 g per cup.

The 17.8% spread exceeds the 10% milled-category tolerance because two distinct commercial clusters exist, both anchored by primary producer labels. King Arthur's ingredient weight chart is silent on arborio — no correction opportunity here.\n\nPractical guidance: for risotto and other volume-scaled recipes, weigh arborio rather than measure by cup. If cups are all that is available, ~200 g/cup is a reasonable central default; recipes written around US brands may skew closer to 180 g, Italian recipe imports closer to 210 g.

A common risotto ratio is 1 cup dry rice for two servings (roughly 60 g per person), and at these small scales the cup approximation is close enough for practical cooking. Larger scales — commercial batches, arancini, timballo, or restaurant-portion multiplication — reward the scale.