Conversion formula

The conversion factor from teaspoons to cups is 0.020833333333319, which means that 1 teaspoon is equal to 0.020833333333319 cups:

1 tsp = 0.020833333333319 cup

To convert 21 teaspoons into cups we have to multiply 21 by the conversion factor in order to get the volume amount from teaspoons to cups. We can also form a simple proportion to calculate the result:

1 tsp → 0.020833333333319 cup

21 tsp → V_(cup)

Solve the above proportion to obtain the volume V in cups:

V_(cup) = 21 tsp × 0.020833333333319 cup

V_(cup) = 0.4374999999997 cup

The final result is:

21 tsp → 0.4374999999997 cup

We conclude that 21 teaspoons is equivalent to 0.4374999999997 cups:

21 teaspoons = 0.4374999999997 cups

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 cup is equal to 2.2857142857158 × 21 teaspoons.

Another way is saying that 21 teaspoons is equal to 1 ÷ 2.2857142857158 cups.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty-one teaspoons is approximately zero point four three seven cups:

21 tsp ≅ 0.437 cup

An alternative is also that one cup is approximately two point two eight six times twenty-one teaspoons.

Conversion table

teaspoons to cups chart

For quick reference purposes, below is the conversion table you can use to convert from teaspoons to cups