Pistachios are divided into various types, and each type comes in different sizes. The common types of pistachios include the following:

Akbari Pistachio:

One of the largest and highest-quality types of pistachios.

Common sizes: 18-20, 20-22, 22-24

Ahmad Aghaei Pistachio:

It has a mild taste and an elongated shape.

Common sizes: 22-24, 24-26, 26-28

Kalleh Ghouchi Pistachio:

A large, round pistachio with a large kernel.

Common sizes: 20-22, 22-24, 24-26

Fandoghi Pistachio:

Round and smaller than other types.

Common sizes: 28-30, 30-32, 32-34

Badami Pistachio:

Almond-shaped and elongated.

Common sizes: 26-28, 28-30

These sizes are determined based on the number of pistachios per ounce (approximately 28 grams); the smaller the number, the larger the pistachio.