How to Convert Cooking Measurements (Cups, Tablespoons, ML)
A US cup is 236.59 ml, a tablespoon is 14.79 ml, and a teaspoon is 4.93 ml. Sixteen tablespoons make a cup, and three teaspoons make a tablespoon. Once you have those three numbers, you can convert almost any American recipe into milliliters without opening a second tab.
The tricky part isn’t the math. It’s that “cup” and “tablespoon” don’t mean the same volume everywhere, and rounding a teaspoon to a tidy 5 ml can quietly ruin a batch of cookies. Here’s how the units actually relate, a full recipe converted step by step, and where people get burned.
The conversion factors
| Unit | Milliliters | Tablespoons | Teaspoons |
|---|---|---|---|
| 1 teaspoon (tsp) | 4.93 ml | 1/3 tbsp | 1 |
| 1 tablespoon (tbsp) | 14.79 ml | 1 | 3 |
| 1 fluid ounce (fl oz) | 29.57 ml | 2 | 6 |
| 1 cup | 236.59 ml | 16 | 48 |
| 1 pint | 473.18 ml | 32 | 96 |
| 1 quart | 946.35 ml | 64 | 192 |
| 1 gallon | 3785.41 ml | 256 | 768 |
Everything in that table scales from the same base unit, the teaspoon, so you only need to remember two multipliers: 3 (teaspoons to a tablespoon) and 16 (tablespoons to a cup). Cooks round the teaspoon itself to 5 ml and the tablespoon to 15 ml for convenience, which is close enough for a soup but not for a recipe that depends on a precise ratio of liquid to flour, like a delicate cake batter.
Worked example: converting a pancake recipe
Say a recipe calls for these US measurements:
- 1.5 cups flour
- 1 cup milk
- 2 tablespoons sugar
- 1.25 teaspoons baking powder
- 0.5 teaspoon salt
Converting each one:
- 1.5 cups x 236.59 ml = 354.9 ml flour (measured by volume; see the note on flour below)
- 1 cup x 236.59 ml = 236.6 ml milk
- 2 tbsp x 14.79 ml = 29.6 ml sugar
- 1.25 tsp x 4.93 ml = 6.2 ml baking powder
- 0.5 tsp x 4.93 ml = 2.5 ml salt
Now say you only want half a batch. Halving milliliters is simpler than halving fractions of a cup: 354.9 ml flour becomes 177.5 ml, 236.6 ml milk becomes 118.3 ml, and so on. That’s the real payoff of switching to ml before you scale a recipe up or down, you’re dividing clean decimals instead of fighting with 3/4 of 1.5 cups.
Calculate with your own values
Type any quantity, a cup of buttermilk, two tablespoons of oil, into the field that matches your recipe, and every other unit updates at once.
Common mistakes
Treating a “cup” as one universal size. A US cup is 236.59 ml. A metric cup, the kind used in Australia, New Zealand, and printed on many international recipe sites, is a rounder 250 ml. Japan’s standard rice cooker cup is smaller still, 200 ml. Mix up which one a recipe means and you’re off by 5 to 15 percent before you’ve cracked an egg.
Measuring flour by volume and assuming it’s exact. A cup of flour weighs anywhere from about 120 g if you spoon it lightly into the cup and level it, to over 150 g if you scoop and pack it straight from the bag. That’s close to a 25 percent swing from technique alone, and no ml-to-cup formula fixes it. If a recipe gives both volume and weight, use the weight for baking.
Rounding a teaspoon to exactly 5 ml. It’s actually 4.93 ml. For a pinch of salt in a soup, nobody will notice. For baking soda in a cake, where the acid-to-base ratio drives the rise, that 1.4 percent rounding error compounds with every other rounded measurement in the recipe and can leave a cake slightly dense or slightly domed.
Forgetting fluid ounces measure volume, not weight. A fluid ounce of water weighs close to an ounce, but a fluid ounce of honey or oil does not weigh an ounce, because they’re denser or lighter than water. If a recipe mixes “8 oz flour” (a weight) with “8 fl oz milk” (a volume) in the same list, read carefully before converting either one.
Frequently asked questions
How many tablespoons are in a cup?
Sixteen. That’s also 48 teaspoons or 8 fluid ounces. Half a cup is 8 tablespoons, and a quarter cup is 4 tablespoons.
Is a US cup the same as a metric cup?
No. A US cup is 236.59 ml, while a metric cup, used in Australia, the UK, and much of Europe on translated recipes, is 250 ml. Japan’s standard cup is 200 ml. The difference is small in a single cup but adds up across a multi-cup recipe, so check which convention your source uses.
How do I measure liquids without a measuring cup?
A standard tablespoon holds about 15 ml, and a teaspoon about 5 ml, so common cutlery gets you in the ballpark. For anything more precise, like baking, a kitchen scale measuring grams is more reliable than eyeballing a spoon, since it removes rounding error entirely.
Why do American and European recipes use different units?
The US never fully adopted the metric system, so American recipes measure by volume (cups, tablespoons) using customary units standardized in the early 20th century. Most of the rest of the world measures baking ingredients by weight in grams, which is more precise because it isn’t affected by how tightly an ingredient is packed into a cup.