Bean Bag Filling
Find exactly how much filling your bean bag needs. Enter diameter to get volume in cubic feet, liters, and 50L bag count for round bean bags of any size.
About This Calculator
Our free Bean Bag Filling Calculator helps you determine the exact volume of filling material needed for a round bean bag. Whether you are refilling an old bean bag, making a DIY bean bag, or ordering replacement filler, knowing the precise volume ensures you buy the right amount — saving money and avoiding waste.
How the Bean Bag Filling Calculation Works
This calculator models a round bean bag as a sphere and uses the standard sphere volume formula V = (π/6) × d³, where d is the diameter in feet. The result gives you the filling volume in cubic feet, which is then converted to liters (1 cu ft = 28.3168 L). Finally, the calculator divides the total liters by 50 (the standard retail bag size) to tell you how many bags of filling to purchase.
Why Accurate Filling Measurement Matters
Getting the right amount of bean bag filling is essential for comfort and durability. Underfilled bean bags collapse under weight, offer poor back support, and look deflated. Overfilled bags feel hard, do not conform to your body shape, and can stress the seams, leading to tears. The ideal fill level of 80-85% provides a perfect balance of softness and support. Our calculator removes the guesswork by giving you exact volume measurements.
Choosing the Right Filling Material
Bean bag fillings come in several types. EPS beads (expanded polystyrene) are the industry standard — lightweight, affordable, and available everywhere in 50L bags. Shredded memory foam offers premium comfort with better shape memory but costs more and is heavier. Recycled foam is an eco-friendly alternative that performs similarly to virgin foam. For children's bean bags, micro-beads (smaller EPS beads) create a smoother feel and are less likely to shift. Always check the volume rating of your filling bags, as some brands use different bag sizes.
Tips for Refilling or Making a Bean Bag
When refilling an existing bean bag, empty the old filling completely and measure the diameter of the empty cover while it is fully expanded. For DIY bean bags, use a fabric pattern that accommodates your desired diameter and include a 1-2 inch seam allowance. Most bean bag covers have a zippered opening for easy filling — use a funnel or a cut-off plastic bottle to pour filling without spilling. After filling, zip the cover closed, fluff the bag thoroughly, and let it sit for 24 hours to allow the filling to settle before assessing whether you need more.
Filling Volume Reference Table
For quick reference: a 2 ft diameter bean bag needs ~4.2 cu ft (119 L, 3 × 50L bags); a 3 ft bag needs ~14.1 cu ft (400 L, 8 bags); a 4 ft bag needs ~33.5 cu ft (950 L, 19 bags); a 5 ft bag needs ~65.4 cu ft (1852 L, 38 bags). These estimates assume a perfectly spherical shape; actual volumes may vary slightly based on your bean bag's exact shape and the degree of fill desired.
Frequently Asked Questions
How do I calculate how much filling I need for a bean bag?
Measure the diameter of your round bean bag and enter it into this calculator. The calculator uses the sphere volume formula (π/6 × diameter³) to determine the total cubic feet of filling required. It also converts to liters and tells you how many standard 50L bags to buy.
How much filling does a 3 ft bean bag need?
A 3 ft diameter round bean bag needs approximately 14.1 cubic feet or 400 liters of filling. This requires about 8 standard 50L bags of bean bag filler.
What type of filling is best for bean bags?
EPS (expanded polystyrene) beads are the most common and affordable bean bag filling, offering good shape retention and comfort. Shredded memory foam provides a softer, more luxurious feel but is heavier and more expensive. Recycled foam is an eco-friendly mid-range option. Micro-beads are smaller and create a smoother texture but compress faster.
Should I fill my bean bag completely or leave some space?
Fill a bean bag to about 80-85% capacity for optimal comfort. Overfilling makes the bag too firm and uncomfortable, while underfilling causes it to flatten and lose shape. The ideal fill level lets the bag conform to your body while still holding its structure when not in use.
How do I measure my bean bag to determine the diameter?
For a round bean bag, measure across the widest point from seam to seam using a flexible measuring tape. If the bag is flattened, measure it when it is fully fluffed and expanded. For square or rectangular bean bags, measure the width, depth, and height at the fullest points.
How many 50L bags of filling do I need for a large bean bag?
A 4 ft diameter round bean bag requires about 23.7 cubic feet or 672 liters of filling, which equals 14 standard 50L bags. A 2 ft bean bag needs just 4.2 cubic feet or 119 liters, requiring only 3 bags. Always buy one extra bag as filling settles over time.
How long does bean bag filling last before needing replacement?
EPS bead filling typically lasts 2-5 years with regular use before it compresses and loses shape. Memory foam filling lasts 3-5 years. Signs you need new filling include the bag flattening noticeably, feeling lumpy, or no longer springing back after use. Rotating and fluffing your bean bag regularly extends filling life.
Can I mix different types of bean bag filling?
Yes, mixing fillings can improve comfort. A common combination is 70% shredded foam with 30% EPS beads — the foam provides softness while the beads add structure and reduce compression. Avoid mixing vastly different bead sizes as they may separate over time. Test the mix in small batches before filling your entire bag.