Empty capsules come in different sizes to suit different powders, supplement dosages, and filling requirements.
Choosing the right capsule size is important because it affects:
- powder capacity
- ease of swallowing
- number of capsules needed
- overall supplement experience
This guide explains the most common capsule sizes, their capacities, dimensions, and typical uses.
Empty Capsule Size Chart
| Capsule Size | Approx. Volume | Approx. Capacity* | Typical Use |
|---|---|---|---|
| 000 | 1.37 ml | 700–1400 mg | Large doses |
| 00 | 0.95 ml | 500–950 mg | Popular supplement size |
| 0 | 0.68 ml | 300–700 mg | Daily supplements |
| 1 | 0.50 ml | 250–500 mg | Medium doses |
| 2 | 0.37 ml | 180–370 mg | Smaller supplements |
| 3 | 0.30 ml | 150–300 mg | Small capsules |
| 4 | 0.21 ml | 100–210 mg | Low-dose supplements |
*Approximate capacities depend on powder density.
What Do Capsule Sizes Mean?
Capsule sizes are measured using a standard numbering system.
Generally:
- the larger the number of zeros, the larger the capsule
- the higher the regular number, the smaller the capsule
For example:
- Size 000 = very large capsule
- Size 4 = small capsule
Largest Capsule Size
The largest commonly available standard capsule size is:
Size 000
Size 000 capsules are ideal for:
- large herbal doses
- protein powders
- mushroom supplements
- high-capacity formulations
Most Popular Capsule Sizes
The most commonly used capsule sizes are:
- size 00
- size 0
These sizes provide a good balance between:
- powder capacity
- ease of swallowing
- convenience
They are widely used for vitamins, supplements, and herbal products.
Smallest Capsule Sizes
Smaller capsule sizes such as:
- size 3
- size 4
are commonly used for:
- low-dose supplements
- concentrated ingredients
- easy swallowing
Capsule Capacity and Powder Density
Capsule capacity depends on the density of the powder.
A dense powder weighs more inside the same capsule than a light fluffy powder.
For example:
- 1ml of a heavy mineral powder may weigh 1g+
- 1ml of a light herbal powder may weigh only 0.4g
This is why capsule capacities are usually shown as estimates.
Capsule Size Dimensions
| Capsule Size | Approx. Length | Approx. Diameter |
|---|---|---|
| 000 | 26.1 mm | 9.9 mm |
| 00 | 23.4 mm | 8.5 mm |
| 0 | 21.2 mm | 7.6 mm |
| 1 | 19.0 mm | 6.7 mm |
| 2 | 17.3 mm | 6.1 mm |
| 3 | 15.9 mm | 5.8 mm |
| 4 | 14.3 mm | 5.3 mm |
Gelatin vs HPMC Capsules
Empty capsules are commonly 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 material
- suitable for clean-label products
Which Capsule Size Should You Choose?
The best capsule size depends on:
- powder density
- desired dosage
- swallowing preference
- filling method
General Guide
- Large doses → Size 000 or 00
- Medium doses → Size 0 or 1
- Small doses → Size 2, 3, or 4
How to Measure Capsule Capacity
Capsule capacity is usually measured by:
- internal volume (ml)
- approximate powder weight (mg)
You can use our:
- Powder Density Calculator
- Capsule Capacity Calculator
- Capsule Size Calculator
to estimate more accurate fill weights.
Frequently Asked Questions
What is the most common capsule size?
Size 00 and size 0 are among the most popular capsule sizes for supplements.
What is the largest capsule size?
Size 000 is the largest standard capsule size commonly available.
What is the smallest capsule size?
Size 4 is one of the smallest commonly used empty capsule sizes.
Are vegetarian capsules available in all sizes?
Yes. HPMC vegetarian capsules are available in most standard capsule sizes.
Why do capsule capacities vary?
Capsule capacity depends on powder density, particle size, moisture content, and compression.
Related Pages
- Capsule Size Chart
- Powder Density Calculator
- Capsule Capacity Calculator
- Size 000 Capsule Capacity
- Size 00 Capsule Capacity
- Size 0 Capsule Capacity
- Gelatin vs HPMC Capsules