How to size a stand-up pouch from fill weight
Every other pouch size calculator asks for a volume — but when you’re sourcing packaging you usually know the weight you want to sell, not the cubic inches it occupies. The bridge between them is bulk density: how much a product weighs per unit of volume. Whole coffee beans, ground coffee, protein powder, and gummies all pack differently, so the same 12 oz needs very different pouches. This tool starts from your product and target weight, converts to volume with a published density, and recommends a pouch size.
Why weight-to-volume is the honest starting point
Fill weight divided by bulk density gives fill volume. Add headspace — the empty room a pouch needs to seal cleanly and let contents settle — and you have the internal volume the pouch must hold. From there, conventional stand-up-pouch proportions (a fill height about 1.4× the width and a gusset about 0.6× the width, filling roughly 63% of the bounding box) give a footprint. It’s a starting point, not a spec: grind, moisture, and settling all move real capacity, so a physical fill test confirms it.
From recommended size to a real pouch
Once you have a target size, snap it to the nearest stock size on the sizes chart or take the exact dimensions to a converter. If you want to check the capacity of a specific pouch you already have in mind, the gusset volume calculator runs the math the other direction — width, height, and gusset in, fill volume out.
Questions
How do I calculate what size stand-up pouch I need?
Start from your fill weight and the product’s bulk density: weight divided by density gives the fill volume. Add headspace, then match that volume to a pouch footprint (a stand-up pouch fills roughly 63% of its width × fill-height × gusset). The calculator does this from your product and target weight; confirm the result with a physical fill test.
How much does a stand-up pouch hold?
It depends on the pouch dimensions and the product’s density. A pouch’s fill volume is about its width × fill height × gusset depth × 0.63, and how much weight that holds depends on how dense the product is — the same pouch holds far more grams of gummies than of loose tea. Enter your product and target weight to size a pouch, or use the gusset volume calculator to check a specific size.
What is bulk density and why does it matter for pouch sizing?
Bulk density is how much a product weighs per unit of volume, including the air gaps between pieces. It is the reason a pouch sized for coffee beans is wrong for protein powder at the same weight. Using a realistic density — not a guess — is what turns a target weight into a correct pouch size.
How much headspace should a pouch have?
Typically around 15–20% of the fill volume, more for bulky or settling products and less for dense, stable ones. Headspace lets the pouch seal cleanly, accommodates settling in transit, and keeps the pack from looking overstuffed. The calculator lets you pick a headspace band and folds it into the recommended size.
Are the bulk densities in this tool exact?
They are typical published values, not exact for your specific product. Grind, moisture, formulation, and how the product settles all shift real density, so treat the recommended size as a starting point and confirm with a fill test before committing to tooling or a large order.
Get your pouch made to size.
Bring us a size and a fill and we’ll quote the pouch — structure, barrier, and closure to match the product.