How many teaspoons are in a cup?

There are 48 teaspoons in 1 US cup. This comes from the chain 3 teaspoons = 1 tablespoon and 16 tablespoons = 1 cup, so 16 times 3 equals 48 teaspoons.

How many teaspoons are in half a cup?

Half a US cup equals 24 teaspoons, since half of 48 is 24. A quarter cup is 12 teaspoons and a third of a cup is 16 teaspoons.

Why are there 48 teaspoons in a cup?

Each US tablespoon holds 3 teaspoons, and there are 16 tablespoons in a US cup. Multiplying 16 tablespoons by 3 teaspoons per tablespoon gives 48 teaspoons.

Are metric teaspoons and cups the same as US?

No. A metric teaspoon is 5 mL and a metric cup is 250 mL, which works out to 50 metric teaspoons per metric cup. The US system gives 48 teaspoons per cup.

How many teaspoons are in a quarter cup?

A quarter US cup equals 12 teaspoons. That is 4 tablespoons, and each tablespoon is 3 teaspoons, so 4 times 3 equals 12 teaspoons.

How Many Teaspoons in a Cup? (48 tsp)

The Quick Answer

There are 48 teaspoons in 1 US cup. The number comes from a short, reliable chain of kitchen units: 3 teaspoons make 1 tablespoon, and 16 tablespoons make 1 cup. Multiply 16 × 3 and you get 48 teaspoons.

So the full chain reads: 3 tsp = 1 tbsp, 16 tbsp = 1 cup, therefore 48 tsp = 1 cup. Once you have this anchor memorized, every fraction of a cup becomes simple arithmetic.

Teaspoons in Cup Fractions

Recipes rarely call for a flat cup of a small ingredient. Far more often you need a fraction. Here is every common cup fraction converted to teaspoons.

Cup Amount	Tablespoons	Teaspoons
1/4 cup	4 tbsp	12 tsp
1/3 cup	5 tbsp + 1 tsp	16 tsp
1/2 cup	8 tbsp	24 tsp
3/4 cup	12 tbsp	36 tsp
1 cup	16 tbsp	48 tsp

Notice that 1/3 cup is the only fraction that does not land on a whole number of tablespoons. It is 16 teaspoons exactly, which is why measuring it by the teaspoon is often more precise than by the tablespoon.

Why 48?

The figure is not arbitrary; it is the product of two fixed US ratios. A US tablespoon is defined as 3 US teaspoons, and a US cup is defined as 16 US tablespoons. Stacking those two definitions gives the answer directly.

Written as a single calculation: 16 tablespoons × 3 teaspoons per tablespoon = 48 teaspoons per cup. In volume terms, a US cup is 236.59 mL and a US teaspoon is 4.929 mL, and 236.59 ÷ 4.929 also lands on 48. The teaspoon-to-cup relationship holds whether you count it by spoons or measure it by milliliters.

Metric Note

Outside the United States the units are rounder but different. A metric teaspoon is exactly 5 mL and a metric cup is exactly 250 mL. Dividing 250 by 5 gives 50 teaspoons per metric cup — two more than the US figure.

The gap is small but real: 48 teaspoons in a US cup versus 50 teaspoons in a metric cup. For most home cooking the difference is negligible, but for baking, where ratios matter, follow the system your recipe was written in rather than mixing the two.

Common Teaspoon Conversions

1 US cup = 16 tablespoons = 48 teaspoons
1/2 cup = 8 tablespoons = 24 teaspoons
1/4 cup = 4 tablespoons = 12 teaspoons
1 tablespoon = 3 teaspoons
1 metric cup = 250 mL = 50 metric teaspoons

To convert any cup, tablespoon, or teaspoon amount in one tap, use our cooking converter.