Choosing the correct empty capsule size is important when filling capsules with powders, herbs, vitamins or supplements. This capsule size chart helps compare common capsule sizes, approximate capacities and recommended uses.
Whether you are filling capsules by hand or using a capsule filling machine, understanding capsule sizes can help you select the best option for your needs.
Empty Capsule Size Chart
| Capsule Size | Approximate Volume | Approximate Capacity* | Common Uses |
|---|---|---|---|
| Size 000 | 1.37 ml | 800–1300 mg | Large supplement doses |
| Size 00 | 0.95 ml | 600–950 mg | Most popular supplement size |
| Size 0 | 0.68 ml | 400–700 mg | Herbs and medium doses |
| Size 1 | 0.50 ml | 300–500 mg | Smaller supplement doses |
| Size 2 | 0.37 ml | 200–400 mg | Light powders |
| Size 3 | 0.30 ml | 150–300 mg | Smaller capsules |
| Size 4 | 0.21 ml | 100–200 mg | Low-dose supplements |
*Actual fill weight depends on powder density and packing.
Which Capsule Size Should I Choose?
The best capsule size depends on:
- Powder density
- Desired dosage
- Ease of swallowing
- Number of capsules per serving
For example:
- Size 00 capsules are among the most commonly used sizes for supplements and herbs.
- Size 000 capsules are ideal for larger powder quantities.
- Smaller capsule sizes may be preferred for easier swallowing or lower doses.
Most Popular Capsule Sizes
Size 00 Capsules
Size 00 is one of the most widely used empty capsule sizes. It offers a good balance between capacity and ease of swallowing.
Approximate capacity:
- 600–950 mg depending on powder density
Common uses:
- Vitamins
- Herbal powders
- Supplements
- Mushroom powders
Size 0 Capsules
Size 0 capsules are slightly smaller than size 00 and are often used when a smaller capsule is preferred.
Approximate capacity:
- 400–700 mg
Common uses:
- Daily supplements
- Medium-dose powders
- Herbal blends
Size 000 Capsules
Size 000 is the largest common empty capsule size and is ideal for larger powder servings.
Approximate capacity:
- 800–1300 mg
Common uses:
- Bulk powders
- Larger supplement doses
- Fewer capsules per serving
Gelatin vs HPMC Capsules
Empty capsules are commonly available in two main materials:
Gelatin Capsules
- Traditional capsule material
- Fast dissolving
- Popular for supplements
HPMC Vegetarian Capsules
- Plant-based
- Suitable for vegetarian and vegan use
- Often preferred for moisture-sensitive ingredients
How Capsule Capacity Works
Capsule capacity depends on:
- Powder density
- Particle size
- Moisture content
- Packing method
Dense powders fit more weight into the same capsule compared to light fluffy powders.
For accurate estimates, use our Capsule Size Calculator.
Capsule Size Calculator
Use our interactive calculator to estimate:
- Recommended capsule size
- Approximate powder capacity
- Capsules required per serving
Capsule Filling Tips
- Use a capsule filling machine for faster filling
- Tamp powders evenly for consistent fill weights
- Store capsules in a cool, dry environment
- Test powder density before large production runs
Frequently Asked Questions
What is the most popular capsule size?
Size 00 is one of the most popular capsule sizes for supplements and herbs.
Which capsule size is easiest to swallow?
Smaller capsule sizes such as 1, 2 and 3 are generally easier to swallow.
How many mg fit in a size 00 capsule?
A size 00 capsule typically holds around 600–950 mg depending on powder density.
Are vegetarian capsules better than gelatin capsules?
HPMC vegetarian capsules are plant-based and suitable for vegan and vegetarian use, while gelatin capsules are a traditional option widely used in supplements.
Need Empty Capsules?
Browse our range of:
- HPMC vegetarian capsules
- Gelatin capsules
- Multiple capsule sizes
- Bulk and wholesale quantities
Available in:
- Size 000
- Size 00
- Size 0
- Size 1
- Size 2
- Size 3
- Size 4
Important Note
All capsule capacities shown are estimates only. Actual fill weight depends on powder density, particle size, moisture and filling method.
