# 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。

操作できるページ：https://www.calcopenly.com/ja/conversion/cooking-converter
分野：単位換算ツール

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.

## 入力

- **Ingredient** (選択肢：All-purpose flour, Bread flour, Whole wheat flour, Cake flour, Almond flour, Cornmeal (whole), Cornstarch, Granulated sugar, Brown sugar (packed), Confectioners' (icing) sugar, Butter, Long-grain rice (dry), Rolled oats, Honey, Maple syrup, Molasses, Table salt, Cocoa powder (unsweetened), Peanut butter, Chocolate chips, Walnuts (chopped), Raisins, Shredded coconut (sweetened), Baking powder, Baking soda, Whole milk, Water)
- **Amount**: Fractions work: 1 1/2, 3/4
- **変換元** (選択肢：米カップ (cup), メートル法カップ (cup (metric)), 米大さじ (tbsp), 米小さじ (tsp), 米液量オンス (fl oz), ミリリットル (mL), リットル (L), gram (g), kilogram (kg), ounce (oz), pound (lb))
- **変換先** (選択肢：米カップ (cup), メートル法カップ (cup (metric)), 米大さじ (tbsp), 米小さじ (tsp), 米液量オンス (fl oz), ミリリットル (mL), リットル (L), gram (g), kilogram (kg), ounce (oz), pound (lb))

## 結果

- Converted amount — 主な結果
- 単位換算
- Weight (g)
- 体積 (mL)
- Density used (g/mL)

## 計算式

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

## 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

### Metric cup (250 mL) of packed brown sugar

- Ingredient: Brown sugar (packed)
- Amount: 1
- 変換元: メートル法カップ (cup (metric))
- 変換先: gram (g)
- **Converted amount: 225.1 g**
- 照合元：King Arthur: 1 US cup (236.5882365 mL, NIST HB 44) = 213 g; 250 × 213 / 236.5882365 = 225.0746 (Python fractions)

### Volume to volume needs no density: 3 tsp honey in tbsp

- Ingredient: Honey
- Amount: 3
- 変換元: 米小さじ (tsp)
- 変換先: 米大さじ (tbsp)
- **Converted amount: 1 tbsp**
- 照合元：NIST HB 44 App. C: 1 tablespoon = 3 teaspoons

## 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.

## 出典

- [King Arthur Baking — Ingredient weight chart](https://www.kingarthurbaking.com/learn/ingredient-weight-chart)
- [USDA FoodData Central — Milk, whole, 3.25% (FDC 171265); Water, tap, drinking (FDC 173647)](https://fdc.nal.usda.gov/)
- [NIST Handbook 44, Appendix C — US cup, tablespoon and teaspoon](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)