Capsule Size Calculator
Estimate which empty capsule size may suit your powder using target fill weight and bulk density. Capsule capacity is based on volume, so the same milligram weight can require different capsule sizes for different powders.
How the calculator works
Required volume = target powder weight in grams ÷ powder bulk density in g/mL. The calculator then compares that estimated volume with our nominal capsule volumes: Size 5 0.13 mL, Size 4 0.21 mL, Size 3 0.30 mL, Size 2 0.37 mL, Size 1 0.50 mL, Size 0 0.68 mL, Size 00 0.95 mL and Size 000 1.37 mL.
Don’t know your powder density?
Do not guess if accurate fill weight matters. Measure or obtain the bulk density of the actual formulation. For a quick comparison of physical dimensions and typical capacities, see our Empty Capsule Size Guide.
Popular capsule-size questions
What capsule size for 500 mg? · Size 000 vs Size 00 · Size 00 vs Size 0
