Cups to grams, without the guesswork

Weight is what your recipe really means. Enter an amount, pick your ingredient and cup standard, and see exactly how we convert it — with the assumptions shown.

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Amount (cups)

Ingredient

Cup standard

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120 grams

US cup · all-purpose flour · spoon and level

Common conversions

Common cup measures in grams and ounces — US cup · 240 ml
Cups	Flour	Milk	Butter	Sugar	Brown sugar	Icing sugar	Honey	Cocoa
⅛	15 g	31 g	28 g	25 g	28 g	15 g	42 g	11 g
¼	30 g	61 g	57 g	50 g	55 g	30 g	85 g	22 g
⅓	40 g	81 g	76 g	67 g	73 g	40 g	113 g	29 g
½	60 g	122 g	114 g	100 g	110 g	60 g	170 g	43 g
⅔	80 g	163 g	151 g	133 g	147 g	80 g	226 g	57 g
¾	90 g	183 g	170 g	150 g	165 g	90 g	254 g	65 g
1	120 g	244 g	227 g	200 g	220 g	120 g	339 g	86 g
1½	180 g	366 g	341 g	300 g	330 g	180 g	509 g	129 g
2	240 g	488 g	454 g	400 g	440 g	240 g	678 g	172 g

US cup · 240 ml · all-purpose flour, spoon and level. Reviewed 2026-07.

Quick answers

Flour: 1 US cup ≈ 120 g

One US cup of all-purpose flour weighs about 120 grams (4.2 oz) when spooned into the cup and levelled. Scooped straight from the bag it can reach 130–150 g, which is why recipes disagree.

Milk: 1 US cup ≈ 244 g

One US cup of whole milk weighs about 244 grams (8.6 oz). Milk is close to water but slightly denser, so a cup weighs a little more than 240 g.

Butter: 1 US cup ≈ 227 g

One US cup of unsalted butter weighs about 227 grams (8 oz). One US cup of butter is two standard sticks, so 227 g is an exact, reliable figure.

Why results differ

A cup measures volume, not weight, so the answer depends on the ingredient and how it is measured. A cup of flour can weigh 110–150 g depending on whether it is scooped, spooned or sifted. We assume spoon-and-level — the method most modern recipes use — so treat every cup conversion as a close estimate, not an exact truth.

Sources: USDA FoodData Central · King Arthur ingredient weight chart. Reviewed 2026-07.