FIBC Measurement Calculator
Enter a bulk bag's dimensions on the labeled isometric drawing for a filled-volume & weight estimate, with FIBC types, options and terminology.
Enter a bulk bag's dimensions on the labeled isometric drawing for a filled-volume & weight estimate, with FIBC types, options and terminology.
Enter the dimensions on the drawing. Body W × L × H gives the filled volume; the rest is optional.
| FIBC | Flexible Intermediate Bulk Container: a "bulk bag" or "super sack". |
| SWL | Safe Working Load: the maximum rated fill weight. |
| Safety factor (SF) | Break load ÷ SWL: 5:1 single-trip; 6:1 standard-duty and 8:1 heavy-duty multi-trip (ISO 21898:2024). UN-marked bags are top-lift tested at 6 × maximum net mass. |
| Spout | Tubular fabric inlet (top) or outlet (bottom) for filling / discharging. |
| Tare | Weight of the empty bag. |
| Liner | Inner bag (PE or barrier film) for moisture / contamination protection. |
| PBD | Propagating brush discharge: the energetic static discharge that Type B / C / D fabrics prevent. |
| GSM / denier | Fabric weight (grams per m²) and yarn thickness: they set strength & permeability. |
Common FIBC types include: Duffle Top, Baffle Bag (Q-Bag), U-Panel, 4-Panel, Circular / Tubular, Full Open.
| Duffle top | Wide fabric skirt that ties closed over the fill opening: covers the full bag width. |
| Baffle bag (Q-bag) | Internal corner baffles hold a square shape when filled: more cube fill & tighter stacking. Also called form-stable. |
| U-panel | Body from one U-shaped piece (two sides + base) + two end panels: the most common, cost-effective construction. |
| 4-panel | Body from four side panels + a base; holds a squarer shape for heavier / denser loads. |
| Circular / tubular | Seamless woven-tube body (no side seams), stitched only at the top & base; favored for food-grade & fine powders. |
| Full open | A top or bottom that opens completely: full-open top for fast filling; full-open (drop) bottom to dump non-flowing product at once. |
| Type | Use |
|---|---|
| Type A | Plain fabric, no electrostatic protection. Only for products with an MIE above 1,000 mJ, in surroundings with no flammable gas, vapor or combustible dust cloud. |
| Type B | Fabric with a breakdown voltage below 6 kV, which prevents propagating brush discharges. Not grounded. For combustible dusts with an MIE above 3 mJ, in non-flammable surroundings or dust Zones 21/22. Not for products or dust clouds with an MIE of 3 mJ or less, and never where flammable gas or vapor is present. |
| Type C | Conductive fabric or threads connected to grounding point(s); resistance to the grounding point no more than 1 × 108 Ω. Must be connected to earth before filling or emptying starts and stay connected. An ungrounded Type C bag is more hazardous than Type A or B. For combustible dusts and gas Zones 1/2 (groups IIA, IIB). |
| Type D | Static-protective fabric that prevents incendive discharges without a connection to earth. For combustible dusts and gas Zones 1/2 (groups IIA, IIB). Not for group IIC. Protection can be lost if the surface is contaminated with conductive material (water, grease); conductive powders should use Type C. |
| Inner liners | The liner must be a type permitted with the FIBC type (liner types L1, L1C, L2, L3). A wrong liner defeats Type B, C or D. |
Classification per IEC 61340-4-4:2018. Selection depends on the product, the surroundings and the liner; confirm with GQI.
| Lifting loops (standard) | Four corner loops sewn at the corners, standing upright: the default lift. |
| Cross-corner | Loops sewn diagonally across the corners; fold flat and self-open under a fork. |
| Stevedore / single loop | One or two central loops for crane / hook lifting. |
| Sleeve (hood) lift | Fabric sleeve in place of loops; a lifting bar passes through. |
| UN-certified | Tested & marked for shipping hazardous (dangerous-goods) materials. |
| Document pouch | Sewn-on sleeve that holds paperwork / labels. |
| Ventilated | Breathable fabric or mesh stripes for products that must "breathe" (e.g. produce, firewood). |
| Coated (vs uncoated) | A PP laminate that lowers permeability to fines / moisture, vs bare woven PP. |
| Petal / dust cover | Fabric flap that protects and ties over a spout. |
| Drop bottom (full open) | Base that opens completely to dump non-flowing product at once. |
| Conical bottom | Cone-shaped base that channels dense or sticky product to the spout. |
| Tie closure | Drawstring tie that seals a spout. |
| Iris closure | Iris valve that seals the discharge spout. |
| Reinforced lifting loops | Extra-strength or extended loops for a higher SWL or specific lifting gear. |
Estimates filled volume and weight for an FIBC bulk bag from its dimensions, alongside bag types, options and the terminology used on a specification sheet. The estimate assumes nominal dimensions and uniform fill; a filled bag bulges and settles, so actual capacity differs. Safe working load and safety-factor ratings always come from the bag manufacturer, not from a calculator.