Size 00 capsules are one of the most widely used larger empty capsule sizes for self-filling powders and supplements. A locked Size 00 capsule is approximately 23.3 mm long, with an internal volume of about 0.95 mL and a typical guide fill range of 600–1100 mg, depending on powder density.
Pure Capsules offers Size 00 empty capsules in multiple shell types, including gelatin, vegetarian HPMC, pullulan, DRcaps® delayed-release capsules and selected Licaps® options. Use this page as the main Size 00 guide, then choose the shell material or product that matches your needs.
The actual weight that fits in a capsule depends on the bulk density, particle size and packing of the powder. Capsule size is fundamentally a volume measurement, so the same capsule can hold very different weights of different ingredients.
Size 00 Capsule Capacity
| Specification | Size 00 |
|---|---|
| Approx. volume | ~0.95 mL |
| Typical guide fill range* | 600–1100 mg |
| Relative size | very large |
*Approximate guide only. Actual fill weight depends on the material being filled and how densely it packs.
Easy Visual Size Reference
A size 00 capsule is about 23.3 mm long when locked. As a simple everyday reference, when laid lengthways, it is roughly as long as a UK £1 coin is wide. This comparison is only to help visualise the size; capsule dimensions should be used for accurate fitting.
What Is Size 00 Commonly Used For?
Size 00 can be used for self-filling powders and other suitable dry ingredients when its volume matches the required fill. The best size should be chosen from the physical volume of the ingredient rather than from milligrams alone.
How to Estimate Whether Your Powder Will Fit
If you know the powder’s bulk density in g/mL, multiply that value by the capsule volume (~0.95 mL) to estimate an approximate fill weight. Always allow for normal variation in powder flow and packing.
Size 00 vs Other Capsule Sizes
Capsule sizes become progressively smaller from 000 to 5. Use our complete Empty Capsule Size Guide to compare 000, 00, 0, 1, 2, 3, 4 and 5 in one table.
Size 000 · Size 00 · Size 0 · Size 1 · Size 2 · Size 3 · Size 4
Gelatin, HPMC, Pullulan or Delayed-Release?
The correct shell depends on more than size. Material, dietary preference and release profile can all matter. Pure Capsules supplies multiple capsule types and sizes, including gelatin, vegetarian HPMC, pullulan and selected delayed-release options.
Frequently Asked Questions
How many milligrams fit in a size 00 capsule?
A typical guide range is about 600–1100 mg, but there is no single guaranteed milligram capacity because powders differ in bulk density.
Is size 00 suitable for every powder?
No. Suitability depends on the powder volume, flow properties and your intended fill quantity. Test with the actual ingredient where possible.
Where can I compare all capsule sizes?
See the Pure Capsules empty capsule size chart for a full side-by-side comparison.
Shop Size 00 Empty Capsules by Material
Choose the Size 00 capsule type that matches your formulation: Size 00 Gelatin Capsules · Size 00 HPMC Vegetarian Capsules · Size 00 Pullulan Capsules · Size 00 DRcaps® Delayed-Release Capsules · Size 00 Licaps®
Not sure which shell technology is right? Compare our empty capsule types or use the Capsule Size Calculator.
Ready to choose? Browse all empty capsules.
