Size 00 vs Size 0 Capsules

Size 00 and Size 0 are among the most commonly considered empty capsule sizes. Size 00 provides more internal volume; Size 0 is physically smaller.

Capacity comparison

Approximate volume is 0.95 mL for Size 00 and 0.68 mL for Size 0. Our general reference ranges are approximately 600–1100 mg for Size 00 and 400–800 mg for Size 0, but actual weight depends on powder bulk density and filling method.

Physical size comparison

Approximate locked length is 23.30 mm for Size 00 and 21.70 mm for Size 0. The difference in external size can matter for swallowing and for compatibility with capsule filling machines.

How to decide

Start with the volume required by your formulation. If both sizes provide sufficient capacity, physical capsule size and equipment compatibility may help determine the better option.

Use our full capsule size chart, Size 00 Guide and Size 0 Guide. For shopping, compare our Size 00 clear gelatin capsules with Size 0 clear Pullulan Plantcaps®; choose material and size separately according to your formulation.