料理・製菓用カップとグラムの換算器

King Arthur BakingとUSDAの重量表を使い、小麦粉、砂糖、バターなど27種類の製菓材料でカップとグラムを相互換算します。

更新日 2026年9月28日検証済みの例：7

Ingredient

Amount

Fractions work: 1 1/2, 3/4

変換元

変換先

試す

Converted amount

有効桁数：4；最も近い値へ、等距離ならゼロから遠い値へ

単位換算: 1 cup of all-purpose flour ≈ 120 g
Weight: 120g
体積: 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

計算方法 S

Density from the chart
$\rho = \frac{120\ \text{g}}{236.5882365\ \text{mL}} = 0.50721\ \text{g/mL}$
King Arthur Baking ingredient weight chart: 1 cup = 120 g
Volume to weight
$1\ \text{cup} = 236.58824\ \text{mL};\quad 236.58824\ \text{mL} \times 0.50721\ \text{g/mL} = 120\ \text{g}$

料理・製菓用カップとグラムの換算器について

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.

計算例

1 cup all-purpose flour in grams

Ingredient: All-purpose flour
Amount: 1
変換元: 米カップ (cup)
変換先: gram (g)

Converted amount: 120 g

照合元：King Arthur chart: all-purpose flour, 1 cup = 120 g

100 g sugar in cups

Ingredient: Granulated sugar
Amount: 100
変換元: gram (g)
変換先: 米カップ (cup)

Converted amount: 0.5051 cup

照合元：King Arthur chart: 1 cup granulated sugar = 198 g; 100/198 = 0.50505

1 tablespoon butter in grams

Ingredient: Butter
Amount: 1
変換元: 米大さじ (tbsp)
変換先: gram (g)

Converted amount: 14.13 g

照合元：King Arthur chart: 8 tbsp butter = 113 g; 113/8 = 14.125

1 cup whole milk in grams

Ingredient: Whole milk
Amount: 1
変換元: 米カップ (cup)
変換先: gram (g)

Converted amount: 244 g

照合元：USDA FoodData Central 171265: 1 cup = 244 g

よくある質問

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.

「料理・製菓用カップとグラムの換算器」の精度はどのくらいですか？

精度は入力値と計算方法の前提に依存します。十進演算には有効数字50桁を使いますが、推定、数値計算手法、元データの精度はそれより低い場合があります。表示の丸め処理でこれらの制約がなくなるわけではありません。独立した出典の解答と照合した計算例：7。例えば、「1 cup all-purpose flour in grams」はKing Arthur chart: all-purpose flour, 1 cup = 120 gと照合しています。

この計算方法の出典は何ですか？

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.

この計算機について

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

出典

出典と照合済み

この計算機には、独立した出典の解答を使った計算例が 7 件あります。テストに組み込まれており、ここでも実行できます。