If you are mid-recipe and need this number fast: 1 cup is 48 teaspoons. That is the answer, and the rest of this page is the table, the worked examples and the pitfalls for when you have more time. The conversion is exact, because both units are defined volumes in the same system — unlike a cup of flour, which changes weight with the ingredient, a cup is always the same volume, so the factor never varies.
Most people meet this conversion when a recipe is written in one system and their tools are marked in the other. American recipes use cups; metric recipes use teaspoons; and a cook who follows recipes from both ends up converting constantly. The good news is that volume-to-volume conversions are the simplest kind: the factor is exact, it never depends on the ingredient, and it works the same way for water, milk, oil, stock and every other liquid you cook with.
Conversion table
| Cups | Teaspoons |
|---|---|
| ¼ cup | 12 teaspoons |
| ⅓ cup | 16 teaspoons |
| ½ cup | 24 teaspoons |
| ⅔ cup | 32 teaspoons |
| ¾ cup | 36 teaspoons |
| 1 cup | 48 teaspoons |
| 1.5 cups | 72 teaspoons |
| 2 cups | 96 teaspoons |
| 3 cups | 144 teaspoons |
| 4 cups | 192 teaspoons |
Read the table in either direction. Going from cups to teaspoons, multiply by 48; going back, divide by 48 or multiply by 0.0208. The middle rows are the ones recipes use most — ⅔ cup is 32 teaspoons, and 1 cup is 48 teaspoons. If your amount is not in the table, multiply it by 48 and you have the answer. For a quick check: 1 cup is 48 teaspoons, 2 cups are 96 teaspoons, and 10 cups are 480 teaspoons.
Worked examples
Measuring without the right cup. Your cup measure is in the dishwasher and you only have a teaspoon measure. ½ cup is 24 teaspoons, so count out 24 level teaspoons and you are done. It is slower than using the right measure, but it is exact — this is a fixed unit conversion, not an estimate. The only thing to watch is levelling: a heaped teaspoon is not a teaspoon, and three heaped spoonfuls can add a whole extra cup to a delicate batter.
A dressing or sauce, made to taste. A chocolate cake comes together in the bowl: ½ cup of oil, then the same again of vinegar, then seasoning. In teaspoons that first pour is 24 teaspoons. Dressings are forgiving — a little more or less oil will not ruin them — but knowing the conversion means you can scale the dressing up for a party without guessing, and you can write the scaled version down so it tastes the same next time.
A large pot of stock or soup. A stock pot takes 1.5 cups of water, which is 72 teaspoons. At this size the jug is the only sensible tool — counting it out in cups would take all afternoon. Fill the jug to the 72 teaspoons line, pour, and repeat if the pot needs more. And remember that stock reduces as it simmers, so measure the water going in, not the stock coming out.
How the conversion works
The US cup is defined as 236.5882 ml, and the teaspoon is defined as 4.9289 ml. Divide the first by the second and you get 48 — that is the whole derivation, and it is why the conversion is exact rather than approximate. No kitchen experiment was needed to establish it; the units were defined this way, so the ratio follows from the definitions. That is also why the same factor appears in every reliable conversion chart: there is only one right answer, and every source that uses US customary units agrees on it.
The one thing to check is which cup your recipe means. This page uses the US customary cup throughout. A metric cup is 250 ml, an imperial cup is 284 ml, and older recipes sometimes use a 'cup' that means whatever cup the writer had in the cupboard. If a recipe from outside the US gives an amount that looks wrong after converting — a cake with far too much liquid, a soup that is far too thin — the cup is the first suspect. Convert the recipe to grams once, write the grams on the recipe card, and the question never comes up again.
Rounding deserves a note too. The exact factor is 48 to four decimal places, and the full value runs further (236.59 ml divided by 4.93 ml). For everyday cooking, rounding to two or three significant figures is fine: a 1% rounding error is invisible in a soup and barely noticeable in a cake. But round only at the end. If you round the factor and then multiply by a large amount, the rounding error grows with the amount — so keep the full factor through the calculation and round the answer, not the factor.
Volume is not weight
A conversion between two volume units is the same for every ingredient, but a conversion between volume and weight is not — and confusing the two is the most common conversion mistake in cooking. A cup of all-purpose flour weighs about 120 g spooned and levelled (King Arthur Baking), a cup of granulated sugar about 198 g, a cup of butter about 227 g, a cup of milk about 244 g (USDA), and a cup of honey about 336 g. All of those weights are approximate, because they depend on how the ingredient is measured: flour is spooned and levelled, brown sugar is packed at about 213 g a cup, and honey is poured.
Flour weight is the most disputed conversion in baking. King Arthur Baking lists 120 g per cup spooned and levelled, while other sources quote 125 g, 130 g and up to 142 g for a scooped cup. We use the King Arthur spooned-and-levelled value as primary, and the gap is a warning: if you scoop flour instead of spooning and levelling it, you can add 20 g or more per cup, which is enough to make a cake dry. Granulated sugar carries a smaller dispute — King Arthur lists 198 g per cup and the USDA rounds it to 200 g, a difference of rounding rather than a real disagreement. When a recipe matters, verify with a kitchen scale: weigh the ingredient instead of measuring it by volume, and every dispute on this page disappears.
Scaling recipes up and down
Volume conversions scale in a straight line: double the amount, double the result, and the factor never changes. That makes scaling liquids easy, but a scaled recipe is not just scaled liquid. Baking powder, baking soda and yeast do not scale linearly — a tripled cake does not need triple the baking powder, or it will rise fast and collapse. Salt and strong flavours scale by taste, not by arithmetic, so season the scaled batch and adjust. Cooking time changes too: a doubled cake needs longer in the oven, but not twice as long, and a doubled soup needs more simmering time, not more heat. The pan matters as well: doubling a recipe into the same tin gives a deeper batter that cooks unevenly, so split it across two tins or move to a larger one. Convert the liquid amounts first, write them down, then think about the leavening, the seasoning, the pan and the time — in that order — and the scaled recipe will behave like the original.
Frequently asked questions
Does this conversion change for different ingredients?
No — volume is volume. One cup of water, milk, oil, honey or stock is always 48 teaspoons. What changes between ingredients is the weight: a cup of all-purpose flour weighs about 120 g, a cup of granulated sugar about 198 g and a cup of honey about 336 g, so a conversion to grams always depends on the ingredient. But a conversion between two volume units never does, which is why this page has one table for every ingredient.
What is the quickest way to measure 1 cup in teaspoons?
Use a measuring jug marked in teaspoons and fill it to the 48 teaspoons line, reading at eye level on a flat surface. Counting it out in cups one at a time is slower and easier to miscount. If you do not have a jug, a kitchen scale works for water-based liquids, since 1 ml of water weighs about 1 g — but that shortcut only holds for water-like liquids, not for oil or honey.
Why do recipes use cups instead of teaspoons?
Mostly tradition and the tools cooks already own. American recipes were written for American measuring cups, and metric recipes for metric jugs, and neither is going to change. The units themselves are equally good for measuring volume — the difference is only what your kitchen is equipped for. Rather than buying a new set of measures for every recipe, convert once and cook with the tools you have.
How many teaspoons are in 1 cup?
Exactly 48 teaspoons. Multiply any number of cups by 48 to get teaspoons — for example, ¾ cup is 36 teaspoons. The conversion is exact because both units are defined volumes in the US customary system.
What is ⅔ cup in teaspoons?
32 teaspoons. Multiply 0.6667 by 48: 0.6667 × 48 = 32. This is a common recipe amount — a third of a cup of cream, a few spoonfuls of oil — so it is worth knowing it is a straight multiplication with no special case.