Why converting kitchen measurements is trickier than it looks
If a recipe from another country ever came out too wet or too stiff, the measuring is the usual suspect. A "cup" is about 236.6 ml in the United States, 200 ml in Japan and 250 ml in many metric recipes, so a single cup can differ by as much as 50 ml, roughly 20 percent. On top of that, cups and spoons measure volume, while different ingredients weigh different amounts for the same volume: a cup of honey is close to three times heavier than a cup of flour. This converter handles both problems. You pick the convention for the input and for the result so the volume units convert exactly, and when you choose grams it uses an ingredient density to give an estimate.
How the conversion works
Every volume is first turned into milliliters and then divided by the size of the target unit. Cups, tablespoons and teaspoons use the milliliter values of whichever convention you select, and fluid ounces always use the US value of 29.5735 ml.
Result = amount Γ (ml per input unit) Γ· (ml per result unit)
When grams are involved, the tool multiplies or divides by the ingredient's density in g/ml, which is calculated as the grams in one US cup divided by 236.588.
Cup, tablespoon and teaspoon sizes compared
These are the exact values the converter uses; the table is calculated from the same data when the page is built.
| Convention | 1 cup (ml) | 1 Tbsp (ml) | 1 tsp (ml) | Tbsp per cup | vs US cup |
|---|---|---|---|---|---|
| US customary | 236.588 | 14.8 | 4.9 | 16.0 | 0.0% |
| Japan (200 mL cup) | 200 | 15.0 | 5.0 | 13.3 | -15.5% |
| Metric (250 mL cup, 15 mL Tbsp) | 250 | 15.0 | 5.0 | 16.7 | +5.7% |
| Australia (250 mL cup, 20 mL Tbsp) | 250 | 20.0 | 5.0 | 12.5 | +5.7% |
| US nutrition label (240 mL cup) | 240 | 15.0 | 5.0 | 16.0 | +1.4% |
- United States: 1 cup = 16 tablespoons = 48 teaspoons = 8 fl oz is the working rule. Nutrition labels use a rounded "label cup" of 240 ml with 15 ml and 5 ml spoons.
- Japan: a measuring cup is 200 ml, a large spoon (Tbsp) 15 ml and a small spoon (tsp) 5 ml, so one cup holds about 13.3 tablespoons.
- Australia: the cup is 250 ml and the teaspoon 5 ml, but the tablespoon is 20 ml, larger than in the US, UK or Japan. This is the biggest trap. Counting an Australian tablespoon as 15 ml leaves you 25 percent short.
- UK, Canada, New Zealand: current recipes usually follow the metric convention (250 ml cup, 15 ml tablespoon), but older books may use different bases, so check the publication date and country.
- Fluid ounces: a US fl oz is 29.57 ml and an imperial fl oz is 28.41 ml. This converter uses the US value.
Approximate grams per ingredient
Weight depends on particle size, moisture and how an ingredient is packed, so the numbers below are estimates. The per-US-cup weights follow figures commonly used in baking references, and the other columns are calculated from the same density.
| Ingredient | US cup (g) | 200 ml cup (g) | 250 ml cup (g) | 15 ml Tbsp (g) | 5 ml tsp (g) | Note |
|---|---|---|---|---|---|---|
| Water | 237 | 200 | 250 | 15.0 | 5.0 | 1 mL is about 1 g |
| Milk | 245 | 207 | 259 | 15.5 | 5.2 | varies slightly with fat content |
| Vegetable oil | 218 | 184 | 230 | 13.8 | 4.6 | differs a little by oil type |
| Honey | 340 | 287 | 359 | 21.6 | 7.2 | depends on water content |
| All-purpose flour | 120 | 101 | 127 | 7.6 | 2.5 | changes a lot with how it is scooped |
| Granulated sugar | 198 | 167 | 209 | 12.6 | 4.2 | varies with crystal size |
| Brown sugar (packed) | 213 | 180 | 225 | 13.5 | 4.5 | depends on how firmly packed |
| Butter | 227 | 192 | 240 | 14.4 | 4.8 | two US sticks = 1 cup = 227 g |
| Uncooked rice | 198 | 167 | 209 | 12.6 | 4.2 | depends on variety and dryness |
Notice how a 200 ml cup holds about 15.5 percent less than a US cup (200 Γ· 236.588), while a 250 ml cup holds about 5.7 percent more. For flour that means 120 g per US cup becomes roughly 101 g in a 200 ml cup and 127 g in a 250 ml cup. Salt, spices, baking powder and other ingredients vary too much between brands and grinds to list here. When grams really matter, as in bread and pastry, a scale beats any cup.
Worked examples
Example 1: 2 US cups of flour with a 250 ml metric cup. Two US cups are 2 Γ 236.588 = 473.18 ml, which weighs about 240 g at 120 g per cup. Scoop two full 250 ml cups instead and you are adding 500 ml, roughly 254 g, about 14 g too much and enough to make a dough noticeably stiffer. Setting the input to US and the result to metric shows that 2 cups is 1.89 of a 250 ml cup, so use a little under 2 metric cups, or better, weigh 240 g.
Example 2: "2 tablespoons sugar" in an Australian recipe. An Australian tablespoon is 20 ml, so 2 tablespoons are 40 ml, or about 33.5 g of granulated sugar at 0.837 g/ml. Two US tablespoons are 29.57 ml, about 24.8 g. The same words on the page produce roughly 8.7 g of difference, and in a 15 ml spoon you would need 40 Γ· 15 = 2.67 spoonfuls to match the original.
Example 3: 1 cup of butter. In the US, two sticks make 1 cup, which is 16 tablespoons and about 227 g, so one stick is 8 tablespoons and about 113 g. In a 200 ml cup, the same butter density gives about 192 g per cup, so a recipe that wants 227 g needs a little more than one full 200 ml cup.
Common mistakes and misconceptions
- Using drinking cups and cutlery. A coffee mug or a tableware spoon is not a measuring tool. Sizes vary from home to home and the error can easily reach 10 percent or more.
- Scooping flour straight from the bag. Packing flour with the cup can add 10 to 20 percent. Spoon it in lightly and level the top with a knife.
- Using a liquid cup for dry goods. A liquid measuring cup has headroom above the top line, so leveling off flour in it is awkward and inaccurate.
- Mixing up fl oz and oz. Fluid ounces measure volume and ounces measure weight. Water happens to weigh about 1.04 oz per fl oz, but honey is far heavier.
- Assuming every tablespoon is the same. It is not: 15 ml in most places, 20 ml in Australia.
Tips for measuring accurately
- Dry goods: fluff the ingredient, spoon it into the cup, then sweep the surface flat with a straight edge.
- Liquids: set the cup on a flat counter and read the marking at eye level. For a curved surface, read the bottom of the curve.
- Brown sugar and butter: pack brown sugar only when the recipe says "packed". American butter wrappers carry tablespoon markings that make portioning easy.
- Honey and syrup: lightly oil the spoon or warm it first so less sticks.
- Small amounts: for salt or baking powder, use a measuring spoon. A "pinch" is often treated as about 1/16 teaspoon, but there is no official standard.
A sensible order when adapting a foreign recipe: use any weights the author gives, otherwise convert the cups and spoons to milliliters, turn those into grams with the ingredient density, and finally make the recipe once and note in your own kitchen's units what worked. That way conversion error does not pile up from one batch to the next.
Limits of this tool
- Gram conversions are rough. For exact pastry or bread formulas, trust the weights in the original recipe or use a scale.
- Ingredients that are not in the list, such as salt, baking powder and ground spices, vary too much in density to include.
- Small changes in liquid volume caused by temperature are ignored.
- For oven temperatures, use the Oven Temperature Converter.
Putting the result to use
- Find out which country the recipe comes from and set the input convention to match. If you cannot tell, US customary is the safest default.
- Set the result convention to the measuring tools you actually own, often a 200 ml or 250 ml cup with 15 ml and 5 ml spoons.
- For baking, weigh the gram result on a scale. For soups and stews, where tolerance is wide, the cup and spoon result is fine.
- For other units such as length, weight or temperature, see the Unit Converter.
Frequently Asked Questions
Can this convert to grams?
Yes. Choose Gram as a unit and pick an ingredient, and the tool applies that ingredient's approximate density. Even for the same ingredient, the result can be off by 5 to 15 percent depending on how it is packed, so treat grams as an estimate.
Why do measuring cups differ in size between countries?
Each country built its own units historically, and cups were later tied to different round numbers: 236.6 ml (a US 8 fl oz cup), 200 ml and 250 ml. To reproduce a recipe accurately, find out which convention the author used.
Why is an Australian tablespoon 20 ml?
Australia defines the tablespoon as 20 ml, while the teaspoon is still 5 ml. One Australian tablespoon therefore equals 1 and 1/3 of a 15 ml tablespoon. Choose Australia as the input convention when following an Australian recipe.
How many tablespoons are in a cup?
16 in the US, about 13.3 with a 200 ml cup and 15 ml spoon, and 12.5 with Australia's 250 ml cup and 20 ml spoon. The comparison table above shows the figure for each convention.
Is a mug or a paper cup the same as a measuring cup?
No. Drinking vessels differ widely in size and are rarely filled to the brim. When accuracy matters, use a measuring cup that has volume markings, or weigh the ingredient.
Why is a scale more accurate than a cup for baking?
A cup measures volume, so the weight changes with how you fill it. A gram is a fixed mass. Light, fluffy ingredients like flour and cocoa powder show the largest differences between scoops.
Related tools
- Unit Converter - length, weight, temperature, volume and more
- Oven Temperature Converter - Fahrenheit, Celsius and gas mark