Enter your bean bag's length, width, and height to find out exactly how many 1 kg bags of bead filler you need. The Bean Bag Filling Calculator uses your dimensions to estimate the total volume and required filling weight — choose your preferred unit (cm, m, inches, or feet) for a result tailored to your bag.
1 kg Bags of Filler Needed
--
Bean Bag Volume
--
Total Filler Weight
--
Volume (Cubic Meters)
--
A bean bag is a sealed fabric bag filled with soft material, commonly polystyrene beads or PVC pellets. They are popular as casual furniture for homes and offices due to their comfort, affordability, and flexibility. The filling allows the bag to conform to the shape of whoever sits on it.
Bean bag fillers are most commonly made of expanded polystyrene (EPS) beads, similar to the material used in foam packaging. Some alternatives include memory foam chunks, shredded foam, and PVC pellets. Polystyrene beads are the most popular choice because they are lightweight, durable, and provide good support.
To calculate the filler needed, multiply the length, width, and height of your bean bag to get its volume. The general rule is that you need approximately 1 kg of polystyrene beads per 50,000 cm³ (50 liters) of volume. This calculator handles the math automatically — just enter your dimensions.
A bean bag with dimensions 70 cm × 60 cm × 50 cm has a volume of 210,000 cm³ (210 liters). Using the standard formula, that equates to approximately 4.2 kg of filler, or about 5 × 1 kg bags. It's always wise to round up to ensure the bag is comfortably full.
It's generally recommended to slightly overfill your bean bag when first filled, as polystyrene beads compress and flatten over time with use. Buying one extra bag of filler is a common tip so you can top it up later without needing to reorder. A well-filled bean bag provides better support and comfort.
This calculator is designed for rectangular or box-shaped bean bags. For teardrop, round, or irregularly shaped bean bags, you would need to estimate the equivalent rectangular bounding box or use a shape-specific volume formula. The result is always an estimate, so rounding up is advisable.
Over time, polystyrene beads compress and lose their volume, causing the bean bag to feel flatter. Depending on usage, you may need to top up every 1–2 years. Many manufacturers recommend refilling with about 25–50% of the original filling amount to restore comfort.
Standard polystyrene bead filling is generally considered safe when enclosed in a well-stitched, childproof cover. However, loose beads pose a choking hazard for very young children if the bag is opened or damaged. Always check that your bean bag has a child-safe inner liner and a secure outer zip when purchasing for kids.