Conversion formula

The conversion factor from teaspoons to cubic inches is 0.30078124999914, which means that 1 teaspoon is equal to 0.30078124999914 cubic inches:

1 tsp = 0.30078124999914 in3

To convert 18 teaspoons into cubic inches we have to multiply 18 by the conversion factor in order to get the volume amount from teaspoons to cubic inches. We can also form a simple proportion to calculate the result:

1 tsp → 0.30078124999914 in3

18 tsp → V_(in3)

Solve the above proportion to obtain the volume V in cubic inches:

V_(in3) = 18 tsp × 0.30078124999914 in3

V_(in3) = 5.4140624999845 in3

The final result is:

18 tsp → 5.4140624999845 in3

We conclude that 18 teaspoons is equivalent to 5.4140624999845 cubic inches:

18 teaspoons = 5.4140624999845 cubic inches

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 cubic inch is equal to 0.18470418470471 × 18 teaspoons.

Another way is saying that 18 teaspoons is equal to 1 ÷ 0.18470418470471 cubic inches.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that eighteen teaspoons is approximately five point four one four cubic inches:

18 tsp ≅ 5.414 in3

An alternative is also that one cubic inch is approximately zero point one eight five times eighteen teaspoons.

Conversion table

teaspoons to cubic inches chart

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