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Cups to grams converter for cooking and baking

Convert cups to grams, and grams to cups, for 27 baking ingredients including flour, sugar and butter, using King Arthur Baking and USDA weight charts.

Updated Checked against 7 worked examples

Fractions work: 1 1/2, 3/4
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Converted amount
g
Converted amount: 120 g
Shown to 4 significant figures, half-up
Conversion
1 cup of all-purpose flour ≈ 120 g
Weight
120g
Volume
236.6mL
Density used
0.5072g/mL
Measured volumes depend on packing: flour scooped straight from the bag weighs more than flour spooned into the cup and levelled, and the chart's brown sugar is packed. Weigh ingredients when a recipe gives grams.

1 cup of all-purpose flour ≈ 120 g. All-purpose flour weighs about 0.507 g per mL (120 g per US cup), per the King Arthur Baking ingredient weight chart.

What 1 cup of each ingredient weighs

All-purpose flour120 gWater237 gGranulated sugar198 gButter226 gHoney336 g
How it's calculated S

  1. Density from the chart

    ρ=120 g236.5882365 mL=0.50721 g/mL\rho = \frac{120\ \text{g}}{236.5882365\ \text{mL}} = 0.50721\ \text{g/mL}

    King Arthur Baking ingredient weight chart: 1 cup = 120 g

  2. Volume to weight

    1 cup=236.58824 mL;236.58824 mL×0.50721 g/mL=120 g1\ \text{cup} = 236.58824\ \text{mL};\quad 236.58824\ \text{mL} \times 0.50721\ \text{g/mL} = 120\ \text{g}

About the cups to grams converter

A cup, spoon or millilitre measure of an ingredient becomes grams or ounces when multiplied by the ingredient's density in grams per millilitre, and a weight becomes a volume by dividing. Each density is worked out from a published chart entry: all-purpose flour at 120 g per US cup is 0.507 g/mL, while water is 1 g/mL.

Use it to weigh a cup-based recipe on a kitchen scale, or to measure a gram recipe with cups. The default, 1 US cup of all-purpose flour, gives 120 g; the same cup holds 198 g of granulated sugar and 336 g of honey. Converting cups to tablespoons or millilitres needs no density, because both sides are volumes.

Results are typical values, not guarantees. Flour scooped straight from the bag packs down and weighs more than flour spooned in and levelled, so weigh whenever a recipe already gives grams.

Worked examples

1 cup all-purpose flour in grams

Ingredient
All-purpose flour
Amount
1
From
US cup (cup)
To
gram (g)
Converted amount
120 g

Checked against: King Arthur chart: all-purpose flour, 1 cup = 120 g

100 g sugar in cups

Ingredient
Granulated sugar
Amount
100
From
gram (g)
To
US cup (cup)
Converted amount
0.5051 cup

Checked against: King Arthur chart: 1 cup granulated sugar = 198 g; 100/198 = 0.50505

1 tablespoon butter in grams

Ingredient
Butter
Amount
1
From
US tablespoon (tbsp)
To
gram (g)
Converted amount
14.13 g

Checked against: King Arthur chart: 8 tbsp butter = 113 g; 113/8 = 14.125

1 cup whole milk in grams

Ingredient
Whole milk
Amount
1
From
US cup (cup)
To
gram (g)
Converted amount
244 g

Checked against: USDA FoodData Central 171265: 1 cup = 244 g

Questions

How many grams are in a cup of flour?

About 120 g for all-purpose or bread flour, according to King Arthur Baking's ingredient weight chart. Whole wheat flour is lighter at 113 g per US cup and almond flour lighter still at 96 g. Flour compresses, so a cup scooped straight from the bag can weigh noticeably more than one spooned in and levelled; when a recipe gives grams, weigh instead of converting back to cups.

How many grams of sugar are in a cup?

198 g of granulated sugar fill one US cup (King Arthur Baking chart). Packed brown sugar is heavier at 213 g, and confectioners' (icing) sugar is lighter at 113 g because its fine powder holds more air. Going the other way, 100 g of granulated sugar is 0.505 cup, just over half a cup.

Is a cup 236.6 mL, 240 mL or 250 mL?

All three are in use. The US customary cup is exactly 236.5882365 mL, half a US liquid pint (NIST Handbook 44). US nutrition labels use a rounded 240 mL cup (21 CFR 101.9). Australia, Canada and New Zealand use a 250 mL metric cup, 5.7% larger, so a metric cup of packed brown sugar weighs 225 g instead of 213 g.

How many grams is a tablespoon of butter?

About 14 g. A US stick of butter is 8 tablespoons, half a cup or 113 g (4 oz), so each tablespoon weighs 113 ÷ 8 = 14.1 g (King Arthur Baking chart). The US tablespoon is 14.8 mL; an Australian tablespoon is 20 mL, so for Australian recipes enter 20 mL per tablespoon instead.

How accurate is the cups to grams converter?

Accuracy depends on your inputs and the method's assumptions. Decimal arithmetic uses 50 significant digits, but estimates, numerical methods and source data can be less precise; the displayed rounding does not remove those limits. It is checked against 7 worked examples whose answers come from independent sources; for example, “1 cup all-purpose flour in grams” is checked against King Arthur chart: all-purpose flour, 1 cup = 120 g.

Where does the method come from?

King Arthur Baking — Ingredient weight chart; USDA FoodData Central — Milk, whole, 3.25% (FDC 171265); Water, tap, drinking (FDC 173647); NIST Handbook 44, Appendix C — US cup, tablespoon and teaspoon.

About this calculator

grams=volume (mL)×ρρ=chart gramschart volume (mL)\begin{gathered} \text{grams} = \text{volume (mL)} \times \rho \\ \rho = \frac{\text{chart grams}}{\text{chart volume (mL)}} \end{gathered}

Sources

  1. King Arthur Baking — Ingredient weight chart
  2. USDA FoodData Central — Milk, whole, 3.25% (FDC 171265); Water, tap, drinking (FDC 173647)
  3. NIST Handbook 44, Appendix C — US cup, tablespoon and teaspoon

Checked against references

7 worked examples with independently sourced answers ship with this calculator. They run in the test suite; you can run them here too.

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