How many cups is 120 grams of flour?

Using a US cup and all-purpose flour around 120 g per cup, 120 g is about 1 cup. A different flour or packing method can change the value.

Can I convert grams to cups without choosing an ingredient?

No. Cups measure volume and grams measure mass, so density controls the result.

Is a kitchen glass the same as a cup?

Not always. The calculator includes 200 ml and 250 ml glass options, while a US cup is about 236.588 ml.

Grams to Cups Calculator

Convert grams to cups or kitchen glasses for flour, sugar, butter, water and other common ingredients using ingredient density and cup size.

Glass size

A 250 ml kitchen glass, equal to a metric cup.

Ingredient

Glasses

1 250 ml glass = 128 g flour

Grams

Density: 0.51 g/ml

Visual estimate

250 ml • All-purpose flour

1 glass(es)

Quick reference

How much g flour is in common glass fractions

1/4

glass

31.9

g flour

1/3

glass

42.5

g flour

1/2

glass

63.8

g flour

2/3

glass

g flour

3/4

glass

95.6

g flour

glass

128

g flour

1 1/2

glass

191

g flour

glass

255

g flour

glass

383

g flour

Ingredient chart - grams per glass

Glass size: 250 ml glass (250 ml)

Ingredient	1 glass	1/2 glass	1/4 glass
🌾All-purpose flour	128 g	63.8 g	31.9 g
🌾Whole wheat flour	120 g	60 g	30 g
🍬Granulated sugar	213 g	106 g	53.1 g
🟫Brown sugar	233 g	116 g	58.1 g
❄️Powdered sugar	125 g	62.5 g	31.3 g
🧂Table salt	300 g	150 g	75 g
🍚Uncooked white rice	200 g	100 g	50 g
🟫Buckwheat groats	185 g	92.5 g	46.3 g
🥣Rolled oats	85 g	42.5 g	21.3 g
🌾Semolina	180 g	90 g	45 g
🍫Cocoa powder	105 g	52.5 g	26.3 g
🥔Cornstarch	163 g	81.3 g	40.6 g
🥛Milk	258 g	129 g	64.4 g
💧Water	250 g	125 g	62.5 g
🍯Honey	355 g	178 g	88.8 g
🛢️Vegetable oil	230 g	115 g	57.5 g
🧈Melted butter	228 g	114 g	56.9 g
🥄Sour cream	250 g	125 g	62.5 g
🥫Sweetened condensed milk	325 g	163 g	81.3 g
🍞Breadcrumbs	100 g	50 g	25 g

Convert grams to cups by ingredient

Grams measure weight, while cups and kitchen glasses measure volume. The same gram amount fills a different cup volume for flour, sugar, honey, oil and oats, so the ingredient must be selected before converting.

c u p s = \frac{g r am s}{V _{c u p} \cdot ρ}

cups - result, grams - ingredient weight, Vcup - selected cup or glass volume in milliliters, rho - ingredient density in grams per milliliter.

g r am s = c u p s \cdot V_{c u p} \cdot ρ

Reverse check for the selected ingredient and cup size.

Accuracy notes

Flour, cocoa, powdered sugar and starch vary with humidity, sifting, scooping and packing.
Liquids such as water, milk and oil are more repeatable than fluffy dry ingredients.
For bread, cakes, pastry and nutrition tracking, use a kitchen scale when possible.

Ingredient-specific conversion is the core intent. A single universal grams-to-cups factor would be misleading.

Frequently Asked Questions

Sources and References

Calculations are based on the listed reference sources. Links open in a new tab.

Updated: June 2, 2026

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