Size 0 capsules are one of the most popular empty capsule sizes used for supplements, herbs, vitamins, and nutritional powders.

They offer a balance between:
- capsule capacity
- ease of swallowing
- practical daily use
Size 0 capsules are commonly used for both home capsule filling and commercial supplement manufacturing.
Size 0 Capsule Capacity Chart
| Measurement | Size 0 Capsule |
|---|---|
| Approximate Volume | 0.68 ml |
| Approximate Capacity (Low Density Powder) | 300–450 mg |
| Approximate Capacity (Medium Density Powder) | 450–700 mg |
| Approximate Capacity (Dense Powder) | 700–900 mg |
| Capsule Length | Approx. 21.2 mm |
| Typical Use | Medium to large supplement doses |
How Much Powder Fits in a Size 0 Capsule?
The amount of powder that fits inside a size 0 capsule depends on the powder density.
Light fluffy powders weigh less, while dense powders weigh more inside the same capsule.
Example Capacities
| Powder Density | Approximate Fill Weight |
|---|---|
| 0.4 g/ml | 272 mg |
| 0.6 g/ml | 408 mg |
| 0.8 g/ml | 544 mg |
| 1.0 g/ml | 680 mg |

Size 0 Capsule Volume
Size 0 capsules have an approximate internal volume of:
0.68 ml
This makes them a versatile capsule size suitable for many supplement formulations.
Size 0 Capsule Dimensions

| Dimension | Approximate Size |
|---|---|
| Closed Length | 21.2 mm |
| Diameter | 7.6 mm |
| Volume | 0.68 ml |
Actual dimensions may vary slightly depending on manufacturer and capsule material.
What Are Size 0 Capsules Used For?
Size 0 capsules are commonly used for:
- vitamins
- herbal supplements
- mushroom powders
- amino acids
- nutritional supplements
- custom formulations
They are one of the most widely used capsule sizes due to their balance of capacity and swallowability.
Are Size 0 Capsules Easy to Swallow?
Yes. Size 0 capsules are generally considered easier to swallow than larger sizes such as:
- size 000
- size 00
This makes them popular for daily supplement use.
Gelatin vs HPMC Size 0 Capsules
Size 0 capsules are available in:
- gelatin capsules
- HPMC vegetarian capsules
Gelatin Capsules
- traditional capsule material
- smooth texture
- widely used in supplements
HPMC Capsules
- vegetarian and vegan friendly
- plant-based capsule material
- suitable for clean-label products

How to Fill Size 0 Capsules
Size 0 capsules can be filled:
- manually by hand
- using capsule filling trays
- using capsule filling machines
Basic Filling Process
- Separate the capsule halves
- Fill the larger body section
- Tamp powder if required
- Close the capsule securely

Powder Density and Capsule Capacity
Capsule capacity always depends on powder density.
The same size 0 capsule may hold:
- 300mg of a light powder
- 700mg+ of a dense powder
You can use our Powder Density Calculator for more accurate estimates.
Frequently Asked Questions
What is the volume of a size 0 capsule?
The approximate volume is 0.68 ml.
How many mg fit in a size 0 capsule?
Typically between 300mg and 800mg depending on powder density.
Are size 0 capsules vegetarian?
HPMC size 0 capsules are vegetarian and vegan friendly.
What are size 0 capsules used for?
They are commonly used for supplements, herbs, vitamins, and nutritional powders.
Are size 0 capsules easy to swallow?
Yes. Size 0 capsules are considered one of the most comfortable sizes for regular supplement use.
Related Pages
- Capsule Size Chart
- Powder Density Calculator
- Capsule Size Calculator
- Gelatin vs HPMC Capsules
- Size 00 Capsule Capacity
- Size 000 Capsule Capacity
