Bean Bag Filling Calculator
Calculate how many cubic feet or litres of EPS foam filling you need for a bean bag chair.
Formula
Volume = (4/3) × π × r³ × fill%
- Based on spherical volume formula (r = diameter/2).
- Teardrop/pod shapes have approximately 70% of sphere volume.
- 1 ft³ ≈ 28.3 litres of filling.
48-inch round bean bag at 85% fill
Inputs
- Bean Bag Diameter: 48 in
- Shape: sphere
- Fill Level: 85 %
r = 2 ft. Volume = (4/3)π×8 = 33.5 ft³. At 85%: ~28.5 ft³ (≈ 807 litres).
Frequently asked questions
What is EPS filling?
Expanded polystyrene (EPS) foam beads are the standard bean bag filling — lightweight and supportive.
How often do I need to refill?
EPS beads compress over time; refill every 1–3 years depending on usage.
Is shredded foam better than beads?
Shredded foam is denser and lasts longer; it requires the same volume calculation.
What fill level is most comfortable?
75–85% allows slight give; 90–100% is firm.