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 640.5 teaspoons into cups we have to multiply 640.5 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

640.5 tsp → V_(cup)

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

V_(cup) = 640.5 tsp × 0.020833333333319 cup

V_(cup) = 13.343749999991 cup

The final result is:

640.5 tsp → 13.343749999991 cup

We conclude that 640.5 teaspoons is equivalent to 13.343749999991 cups:

640.5 teaspoons = 13.343749999991 cups

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 cup is equal to 0.074941451990683 × 640.5 teaspoons.

Another way is saying that 640.5 teaspoons is equal to 1 ÷ 0.074941451990683 cups.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred forty point five teaspoons is approximately thirteen point three four four cups:

640.5 tsp ≅ 13.344 cup

An alternative is also that one cup is approximately zero point zero seven five times six hundred forty point five 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