Calculate exactly how much filling you need for any bean bag size. Compare EPS beads, memory foam, polyfill, and more by volume, weight, and cost.
Getting the right amount of filling for a bean bag chair is crucial for comfort, support, and value. Too little fill makes the bag feel flat and unsupportive; too much and it becomes stiff and loses its signature moldable comfort. Most bean bags perform best at 70-80% fill capacity.
This bean bag filling calculator takes the guesswork out of purchasing fill material. Select your bean bag size (or enter custom dimensions), choose from six popular fill materials, and set your desired fill level. The calculator instantly shows exactly how much fill you need in cubic feet and liters, the expected weight, total cost, and how many retail bags to purchase.
The material comparison table helps you choose between EPS beads (the classic, lightweight option), shredded memory foam (firmer, more supportive), polyfill (soft, pillow-like feel), and other alternatives. Each material has different density, cost, and comfort characteristics suited to different uses and preferences.
Buying too much or too little bean bag fill is a common and expensive mistake. This calculator helps you estimate the right refill quantity before you order bulky material that is awkward to return or store.
It is useful because fill type changes both comfort and cost. Seeing EPS beads, memory foam, and other options side by side makes the purchase decision more practical than a volume number alone.
Volume for round bags = (π/6) × diameter² × height (in cubic feet). Fill needed = total_volume × fill_percentage. Weight = fill_volume × material_density. Cost = fill_volume × cost_per_cubic_foot.
Result: 18 cu ft needed, 16.2 lbs, ~$63
A large 4-foot bean bag has approximately 24 cubic feet total volume. At 75% fill, you need 18 cubic feet of EPS beads, weighing about 16.2 lbs and costing approximately $63 at standard retail prices.
EPS (expanded polystyrene) beads are the classic bean bag fill — lightweight, affordable, and producing the signature "crunch" feel. They're ideal for casual seating and kids' rooms. Shredded memory foam has surged in popularity for adult bean bag chairs because it provides genuine ergonomic support, making bean bags viable as primary seating. Polyfill creates a soft, pillow-like feel perfect for reading nooks and nurseries.
All bean bag fills compress over time under body weight. EPS beads lose about 25-30% of their loft in the first year of regular use, which is why periodic refilling is necessary. Memory foam retains its shape better (10-15% compression annually) but eventually needs supplementing. Buckwheat hulls are the most durable option, maintaining volume for years, but they make the bean bag very heavy.
Not all bean bags are round. For rectangular or tubular bean bags, measure length, width, and height in inches, then multiply all three and divide by 1,728 to get cubic feet. For irregular shapes, fill the empty bean bag with known-volume items (like gallon jugs) to estimate the total capacity before purchasing fill material.
70-80% is ideal for most bean bags. This provides the signature "sink-in" feeling while still offering support. Kids' bean bags often work better at 80-85% for more stability, while loungers feel best at 65-75%.
EPS beads compress over time and typically need a 20-30% top-up every 6-12 months with regular use. Memory foam lasts longer (12-18 months) but eventually flattens too. Budget for annual refills when calculating total cost.
Standard EPS beads are 3-5mm in diameter and feel slightly "crunchy." Microbeads are much smaller (0.5-1mm), creating a smoother, more fluid feel — similar to a stress ball. Microbeads cost more but produce a premium feel.
Memory foam provides firmer, more supportive seating and doesn't flatten as quickly. However, it's heavier (making the bean bag harder to move) and more expensive. It's ideal for bean bags used as primary seating.
Yes! A popular combination is 70% EPS beads with 30% shredded memory foam. This provides the lightweight moldability of beads with added support from foam. Some brands sell pre-mixed fills for convenience.
Use a cardboard tube or paper funnel inserted into the bean bag zipper. Pour slowly from the fill bag directly into the tube. Work in a non-windy area — static electricity causes EPS beads to cling to everything. A dryer sheet rubbed on your hands reduces static.