What is a medium sized potato?

There's no universally accepted definition of a "medium-sized potato." It really depends on the context:

* Recipe: A recipe might call for "medium potatoes" meaning potatoes roughly the size of a tennis ball, or around 2-3 inches in diameter.

* Grocery store: Stores usually categorize potatoes by size (small, medium, large). However, the size ranges can vary between stores and even different potato varieties.

* Weight: A medium potato can weigh anywhere between 3-6 ounces.

To be sure, it's best to:

* Look at the potato: If you're not sure about the size, check the potato itself. If it's bigger than a tennis ball, it's likely large. If it's smaller than a golf ball, it's likely small.

* Ask the produce clerk: If you're at the grocery store, ask a produce clerk to help you choose potatoes of the appropriate size.

Ultimately, the best way to determine if a potato is medium-sized is to use your own judgment based on the context of your recipe or purchase.