How much fill does a bean bag need?
Bean bags are filled with expanded polystyrene (EPS) beads, sometimes mixed with shredded foam. Too little fill and you sink to the floor; too much and the bag feels like a hard ball. Most chairs are filled to about two thirds to three quarters of the cover’s volume.
The volume of the cover
- Round (ball): π × diameter³ ÷ 6
- Cylinder (pouf): π × diameter² ÷ 4 × height
- Box: length × width × height
The calculator multiplies the cover volume by the fill level, then divides by the size of one bag of beads, rounded up.
Example
A round bean bag 40 in across:
- volume: π × 40³ ÷ 6 ≈ 33,500 in³, about 549 L or 19.4 ft³;
- at 70% fill: about 384 L, or 13.6 ft³ of beads;
- with 3 ft³ bags of beads: 5 bags.
Fill levels by use
| Use | Fill level |
|---|---|
| Lounger that molds around you | 60% to 70% |
| Chair with some support | 70% to 80% |
| Firm footstool or pouf | 85% to 100% |
Unit reminders
Bean bag filling is sold in cubic feet or liters. One cubic foot is about 28.3 L, so a 100 L bag holds about 3.5 ft³. EPS beads are very light, around 1 lb per cubic foot (15 kg/m³), so even a large bag weighs only a few pounds.
Tips
- Beads settle and compress with use: plan to top up 10% to 20% after a few months.
- Fill indoors on a calm day with a funnel made from a cut plastic bottle or a sheet of cardboard; static makes the beads stick everywhere. A light mist of water or anti-static spray helps.
- Use an inner liner, so you can wash the outer cover without emptying the beads.
- Choose a zipper with a child-safety lock for homes with small children: loose beads are a choking hazard.
- Recycled or shredded foam fill weighs more and feels firmer than beads; you need slightly less volume for the same support.