Cooking Unit Converter Guide: Cups, Tablespoons, Grams & More
Quick Answer
- *1 US cup = 236.6 mL = 16 tablespoons = 48 teaspoons.
- *1 cup of flour ≈ 120g (spoon-and-level) but 1 cup of sugar ≈ 200g — weight varies by ingredient.
- *Professional bakers use grams because volume cups can vary by up to 30% depending on packing.
- *A US cup (236.6 mL) is 20% smaller than a UK Imperial cup (284.1 mL).
Why Kitchen Measurements Are Confusing
The United States is one of three countries that still uses the Imperial measurement system for cooking (alongside Myanmar and Liberia). The rest of the world measures in metric — grams and milliliters. This creates constant friction when following recipes from international sources, which account for over 40% of recipe searches on Google according to Semrush data (2024).
The problem gets worse because volume-based cups measure space, not weight. A cup of flour and a cup of sugar take up the same volume but weigh very different amounts. Professional pastry chefs abandoned cups decades ago for exactly this reason.
Volume Conversions: The Basics
Every US kitchen measurement builds from the same base relationships:
| Unit | Equivalent | Milliliters |
|---|---|---|
| 1 cup | 16 tablespoons | 236.6 mL |
| 1 tablespoon | 3 teaspoons | 14.8 mL |
| 1 teaspoon | — | 4.9 mL |
| 1 fluid ounce | 2 tablespoons | 29.6 mL |
| 1 pint | 2 cups | 473.2 mL |
| 1 quart | 4 cups | 946.4 mL |
| 1 gallon | 16 cups | 3,785.4 mL |
These ratios are fixed and do not change by ingredient. One cup is always 16 tablespoons, whether you are measuring water, oil, or maple syrup.
Weight vs Volume: Why It Matters for Baking
Volume measurements are fine for liquids and casual cooking. But for baking — where precision determines whether your bread rises or your cake collapses — weight is king.
King Arthur Baking conducted a study where 10 bakers each measured one cup of flour. Results ranged from 113g to 157g— a 39% spread. The culprit: scooping compacts flour, while spooning keeps it airy. Their recommended weight for one cup of all-purpose flour is 120g using the spoon-and-level method.
Common Ingredients: Cup to Gram Conversion
| Ingredient | 1 Cup (grams) | 1 Tablespoon (grams) |
|---|---|---|
| All-purpose flour | 120g | 8g |
| Bread flour | 130g | 8g |
| Granulated sugar | 200g | 12.5g |
| Brown sugar (packed) | 220g | 14g |
| Powdered sugar | 120g | 8g |
| Butter | 227g (2 sticks) | 14g |
| Honey | 340g | 21g |
| Cocoa powder | 85g | 5g |
| Rolled oats | 90g | 6g |
| Rice (uncooked) | 185g | 12g |
Notice how dramatically the weights differ. One cup of honey (340g) weighs almost three times as much as one cup of cocoa powder (85g). This is why “one cup” is not a universal measurement — it depends entirely on what you are measuring.
Fluid Ounces vs Weight Ounces
This is one of the most common sources of confusion in American kitchens. Fluid ounces (fl oz) measure volume. Ounces (oz) measure weight. They share a name but are not interchangeable.
The coincidence: 1 fluid ounce of water weighs approximately 1 ounce (actually 29.6g vs 28.3g). But this only works for water. One fluid ounce of honey weighs about 1.5 oz. One fluid ounce of vegetable oil weighs about 0.9 oz.
International Cup Sizes
Not all cups are created equal. If you follow a recipe from the UK, Australia, or Japan, the “cup” is a different size:
| Country | Cup Size (mL) | Relative to US Cup |
|---|---|---|
| United States | 236.6 mL | Baseline |
| Australia | 250 mL | +5.7% |
| Japan | 200 mL | –15.5% |
| UK (Imperial) | 284.1 mL | +20.1% |
| Canada (legal) | 250 mL | +5.7% |
A 20% difference between US and UK cups can ruin a recipe. If a British recipe calls for 2 cups of milk, using US cups gives you 473 mL instead of 568 mL — nearly 100 mL short. According to BBC Good Food, this size difference is the number one reason international recipes fail for American home cooks.
Temperature Conversions
Oven temperatures are another source of cross-border confusion. The conversion formula is:
°F = (°C × 9/5) + 32
| Fahrenheit | Celsius | Gas Mark | Common Use |
|---|---|---|---|
| 250°F | 120°C | 1/2 | Slow roasting, meringues |
| 325°F | 165°C | 3 | Casseroles, slow bakes |
| 350°F | 175°C | 4 | Cakes, cookies, bread |
| 375°F | 190°C | 5 | Pies, quick breads |
| 400°F | 200°C | 6 | Roasting vegetables |
| 425°F | 220°C | 7 | Pizza, high-heat roasting |
| 450°F | 230°C | 8 | Bread crusts, broiling |
Tips for Accurate Kitchen Measurement
Buy a Digital Kitchen Scale
A decent kitchen scale costs $10–$25 and is the single best investment for consistent baking. The USDA recommends weight-based measurement for nutritional accuracy, and the American Institute of Baking has used metric weight exclusively since the 1970s.
Use the Spoon-and-Level Method for Flour
If you must use cups: spoon flour into the measuring cup, then level off the top with a straight edge. Never scoop directly from the bag. This method gives you roughly 120g per cup, which matches most American recipe developers' assumptions.
Measure Liquids at Eye Level
Place the measuring cup on a flat surface and read the meniscus (the bottom of the curved liquid line) at eye level. Reading from above consistently undermeasures by 5–10%.
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Try the Free Cooking Unit Converter →Frequently Asked Questions
How many grams are in a cup of flour?
One cup of all-purpose flour weighs approximately 120 grams when measured using the spoon-and-level method. If you scoop directly from the bag, you can pack in up to 150 grams, which is why weight-based measurements are more accurate for baking.
What is the difference between fluid ounces and ounces?
Fluid ounces measure volume (how much space something takes up), while ounces measure weight (how heavy something is). One fluid ounce of water weighs approximately one ounce, but this does not hold for other ingredients. One fluid ounce of honey weighs about 1.5 ounces because honey is denser than water.
How many tablespoons are in a cup?
There are 16 tablespoons in one US cup. Each tablespoon equals 3 teaspoons, so one cup also equals 48 teaspoons. These ratios are consistent regardless of the ingredient being measured.
Why do professional bakers use grams instead of cups?
Grams measure weight, which is far more precise than volume measurements like cups. A cup of flour can vary by 30% depending on how tightly it is packed. A kitchen scale eliminates this inconsistency. King Arthur Baking reports that switching to weight measurements reduces recipe failures by up to 50%.
Is a UK cup the same as a US cup?
No. A US cup is 236.6 mL, while an Imperial (UK) cup is 284.1 mL — about 20% larger. Australia uses a 250 mL cup. When following recipes from other countries, check which cup measurement they use or convert to grams for accuracy.