料理の計量換算（カップ・大さじ・小さじ・グラム） - 無料オンライン計算ツール
大さじ、小さじ、計量カップ、ミリリットル、グラムの相互換算。砂糖、小麦粉、醤油などの材料別にも対応。
Quick Reference Guide: Converting recipe cups (volume) to grams (weight) depends on ingredient density. This calculator standardizes measurements using a 240 ml kitchen cup for flour (120g), sugar (200g), and butter (227g). (Reverse formula: Cups = Grams ÷ Density).
Why convert cups to grams at all?
Most recipes printed in the US measure ingredients in cups, tablespoons (tbsp), and teaspoons (tsp). But a cup is a unit of volume, while a gram is a unit of weight.
One cup of flour and one cup of honey weigh very different amounts, because their densities differ. That's why a single '1 cup = X grams' rule cannot apply to every ingredient - each one has its own density.
This matters especially in baking. A little too much or too little flour can change how a cake or loaf turns out, which is why professional pastry chefs and passionate home bakers prefer to measure by weight using a digital scale.
Formulas used by this calculator
This calculator applies standardized culinary volume ratios alongside ingredient-specific bulk densities:
Volume Conversion (Same for Every Ingredient)
- 1 Cup16 tablespoons (tbsp) = 48 teaspoons (tsp) = 240 milliliters (ml)
- 1 Tablespoon (tbsp)3 teaspoons (tsp) = 1/16 cup = 15 ml
- 1 Teaspoon (tsp)1/48 cup = 1/3 tablespoon = 5 ml
Weight Conversion (Density Dependent)
- Grams (Weight)grams = volume in cups × ingredient density (g/cup)
- Reverse Formula (Grams to Cups)cups = weight in grams ÷ ingredient density (g/cup)
- Ounces (Weight)ounces (oz) = grams ÷ 28.3495
Standard Kitchen Cup (240 ml) vs. US Legal Cup (236.59 ml): Everyday cookbooks and kitchen measuring sets universally round 1 cup to 240 ml. Densities are calibrated against USDA FoodData Central and baking-industry standards (e.g. King Arthur Baking). All-purpose flour is calibrated at 120 g/cup under spoon-and-level measurement.
Step-by-Step Calculation Examples
- 1.Flour Density: 120 grams per cup (g/cup)
- 2.Weight Calculation: 1 × 120 = 120 grams (g)
- 3.Ounce Conversion: 120 ÷ 28.3495 ≈ 4.23 oz
- 4.Volume Equivalents: 16 tbsp = 48 tsp = 240 ml
- 1.Convert tbsp to cups: 2.5 ÷ 16 = 0.15625 cup
- 2.Brown Sugar Density: 220 grams per cup (g/cup)
- 3.Weight Calculation: 0.15625 × 220 ≈ 34.4 grams (g)
- 1.Convert ml to cups: 125 ÷ 240 = 0.5208 cup
- 2.Butter Density: 227 grams per cup (g/cup)
- 3.Weight Calculation: 0.5208 × 227 ≈ 118.2 grams (g) ≈ 4.17 oz
Note: This calculator assumes a level measurement (swept flat with a straight edge, not heaped). If an ingredient was scooped packed or sifted loose, actual weight can vary.
Table A - Calculator Density Values vs. USDA & Baking Industry Standards (1 Cup)
| Ingredient | In This Calculator | USDA & Industry References (Typical Range) |
|---|---|---|
| All-Purpose Flour | 120 g | ~120 – 125 g (depends on scoop vs. spoon-and-level) |
| Granulated White Sugar | 200 g | ~200 g |
| Packed Brown Sugar | 220 g | ~220 g |
| Butter / Margarine | 227 g | ~227 g (1 US Stick = 113.5 g) |
| Water / Milk | 240 g | ~240 g (Milk ~245 g) |
| Vegetable / Olive Oil | 218 g | ~216 – 218 g |
| Rolled Oats | 90 g | ~80 – 90 g |
Note: Slight variations between sources are completely normal - there is no single international legal constant for culinary dry goods, because packing technique, brand, and relative humidity influence bulk weight.
Table B - Volume Unit Quick Reference (Universal Across Ingredients)
| Unit | Cup Equivalent | Metric Volume |
|---|---|---|
| 1 Teaspoon (tsp) | 1/48 cup | 4.93 ml (~5 ml) |
| 1 Tablespoon (tbsp) | 1/16 cup (3 tsp) | 14.79 ml (~15 ml) |
| 1 Cup | 1 cup (16 tbsp / 48 tsp) | 240 ml (exact legal US: 236.59 ml) |
| 1 US Stick Butter | 1/2 cup (8 tbsp) | ≈ 113.5 grams (g) |
Table C - All 7 Supported Ingredients at a Glance
| Ingredient | Grams per Cup (g/cup) | Typical Recipe Applications |
|---|---|---|
| All-Purpose Flour | 120 g | Cakes, breads, cookies, pancakes |
| Granulated Sugar | 200 g | Sponge cakes, meringues, syrups, cookies |
| Packed Brown Sugar | 220 g | Chocolate chip cookies, butterscotch, glazes |
| Butter / Margarine | 227 g | Pastry dough, buttercream, laminated dough |
| Water / Milk | 240 g | Bread hydration, cake batters, sauces |
| Vegetable / Olive Oil | 218 g | Chiffon cakes, muffins, dressings |
| Rolled Oats | 90 g | Oatmeal, granola bars, crisp toppings |
Why do '1 cup = X grams' figures differ across the internet?
First, 'scooping' versus 'spoon-and-level'. If you dip the measuring cup directly into the flour canister (the scoop method), the flour compacts under pressure and can weigh up to 140 grams per cup. If you spoon flour lightly into the cup and sweep the excess level with a straight knife, the flour stays aerated and weighs exactly 120 grams. This single difference in technique can alter the flour in your batter by 15% to 20%.
Second, brand, milling fineness, and humidity. Flours from different wheat varieties and mills possess varying granulations. In humid climates, flour absorbs ambient water vapor, noticeably increasing its density.
Third, differing reference protocols. USDA FoodData Central measures under laboratory sampling protocols (listing flour near 125 g/cup), whereas test-kitchen authorities such as King Arthur Baking standardize around the 120 g/cup spoon-and-level technique. Neither authority is wrong - they simply reflect different physical packing conventions.
Practical Takeaway: For delicate baking (soufflés, macarons, artisan sourdough), always use a digital scale set to grams and follow the author's tested weight. This converter provides the most widely accepted standard culinary estimate for everyday recipe success.
料理の計量換算（カップ・大さじ・小さじ・グラム）に関するよくある質問（FAQ）
How do I convert grams to cups?
Divide the weight in grams by the ingredient's grams-per-cup density (Cups = Grams ÷ Density). For example, 100 grams of granulated sugar = 100 ÷ 200 = 0.5 cup (half a cup), and 100 grams of all-purpose flour = 100 ÷ 120 ≈ 0.83 cup (about 5/6 cup).
How many grams in 1 cup of flour?
120 grams in this calculator. Standard culinary references range between 120 and 125 grams depending on whether the flour was scooped directly or spooned and leveled.
How many grams in 1 cup of sugar?
Approximately 200 grams for granulated white sugar.
How many grams in 1 cup of butter?
Exactly 227 grams (8 ounces). In the United States, 1 standard stick of butter equals half a cup, or about 113.5 grams.
How do I convert tablespoons to grams?
First divide tablespoons by 16 to find the cup equivalent, then multiply by that ingredient's grams-per-cup density. For example, 2 tbsp of flour = (2 ÷ 16) × 120 = 15 grams.
How many ml in 1 US cup?
Kitchens and recipe authors universally use 240 ml. The exact US legal cup defined for nutrition labeling is 236.59 ml.
What does 'packed' brown sugar mean?
Packed means pressing the brown sugar firmly into the measuring cup to eliminate air pockets. This compaction gives brown sugar a higher density (220 g/cup) than granulated white sugar (200 g/cup).
Does this converter work for all types of flour or oil?
No. It is calibrated specifically for the 7 standard ingredients shown. Specialty items like almond flour, cake flour, whole wheat, or solid coconut oil have distinct densities.
Sources & Culinary References
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