How many grapefruits in one cup of grapefruit juice?

It's impossible to say exactly how many grapefruits are in one cup of grapefruit juice without more information. Here's why:

* Grapefruit Size: Grapefruits vary significantly in size. A small grapefruit might only yield a half cup of juice, while a large one could produce more than a cup.

* Juicing Method: The juicing method also affects the yield. A manual juicer extracts less juice than a high-powered electric juicer.

* Pulp Content: Some people prefer their juice with pulp, which would decrease the volume of juice per grapefruit.

General Estimation:

As a very rough estimate, you might need 1 to 2 medium-sized grapefruits to get one cup of juice.

For a more precise answer, you would need to know:

* The size of the grapefruits used

* The juicing method employed

* The desired pulp content