The size of hard gelatin capsules can vary depending on the manufacturer and the intended use. There are several standard sizes available, which are denoted by numbers.

Empty-capsules-size-chart

The most common sizes include:

- Size 000: This is the largest size and can hold approximately 1 gram of powder.
- Size 00: This size can hold approximately 735 milligrams of powder.
- Size 0: It can hold approximately 500 milligrams of powder.
- Size 1: It can hold approximately 400 milligrams of powder.
- Size 2: It can hold approximately 300 milligrams of powder.
- Size 3: It can hold approximately 200 milligrams of powder.
- Size 4: It can hold approximately 150 milligrams of powder.

These are just a few examples, and there are smaller sizes available as well. It's important to note that the exact capacity of each size may vary slightly between different manufacturers.