Packaging Material Waste Calculator
Find out how much of your shipping box is empty space, how much corrugated board and void fill an oversized box wastes, and what a right-sized box would save per box and per order. Includes an EU 50% empty space check.
- Empty space ratio and EU PPWR check
- Board weight and void fill per box
- Right-sized box and order savings
Results
Above the 50% empty space limit
More than half of this box is empty space. From 2030, EU rules cap e-commerce and transport packaging at 50%. EU PPWR planning check
Empty space in your current box
77.5%
Measured inside. Measured outside: 80.7% · product fills 22.5% of the box
- Product volume
- 189 in³ (1 item)
- Current box, inside
- 14 × 10 × 6 in · 840 in³
- Void fill needed per box
- 651 in³
- Board per box
- 5.65 ft² · 11.1 oz
Right-sized box
- Inside size
- 9.5 × 7.5 × 3.5 in (0.25 in clearance per side)
- Empty space
- 24.2% inside · 40.3% outside
- Board per box
- 2.82 ft² · 5.5 oz
- Board saved per box
- 5.5 oz (50% less)
Savings on 1,000 boxes
- Corrugated board saved
- 347 lb (2,832 ft²)
- Void fill avoided
- 342 ft³
- Shipping volume saved
- 383 ft³ (68% less)
- Board carbon footprint saved
- ≈ 170 lb CO₂e
- Dimensional weight per box
- 7.04 lb → 2.28 lb
Dimensional weight uses 139 in³/lb, outside size, before carrier rounding.
Show the calculation
- Product volume = 1 × 9 × 7 × 3 in = 189 in³
- Empty space ratio = (box volume − product volume) ÷ box volume = (840 in³ − 189 in³) ÷ 840 in³ = 77.5% (inside)
- Outside size ≈ inside + 2 × caliper on length and width, + 4 × caliper on height = 14.32 × 10.32 × 6.63 in, so empty space = 80.7% (outside)
- Blank length = 2 × (L + t) + 2 × (W + t) + glue tab = 2 × (14 in + 0.1575 in) + 2 × (10 in + 0.1575 in) + 1.25 in = 49.88 in
- Blank width = (W + t) + (H + t) = 16.32 in; area = 5.65 ft²
- Board per box = area × 122.5 lb/MSF = 11.1 oz
- Right-sized box: items packed as a one item of 9 × 7 × 3 in, plus 0.25 in clearance on every side = 9.5 × 7.5 × 3.5 in
- Right-sized blank = 35.88 in × 11.32 in = 2.82 ft² = 5.5 oz
- Carbon = board saved × 491 kg CO₂e per tonne = 347 lb → ≈ 170 lb CO₂e
About this estimate
- A planning estimate for regular slotted cartons (RSC). Product volume is the outer size of each item; void fill counts as empty space.
- The EU check follows Regulation (EU) 2025/40 Article 24. The official measuring method is due in an implementing act, so treat it as a guide, not legal advice.
- Board weight leaves out starch glue, print and ink. Carbon uses FEFCO’s European average for corrugated packaging.
Your box vs a right-sized box
Flat box blanks, same scale
The board each box is cut from. Dashed lines are the folds.
Use your results
Opens BoxNovo’s quote form and copies your report so you can paste it into the Packaging Specifications field. Nothing is sent until you submit the form yourself.
View the full report
BoxNovo packaging material waste report Product: 1 item, each 9 × 7 × 3 in, kept upright; product volume 189 in³ Board: Single wall, C-flute, 122.5 lb/MSF, caliper 0.1575 in, glue tab 1.25 in Current box (inside): 14 × 10 × 6 in, regular slotted carton Empty space: 77.5% inside, 80.7% outside (Above the 50% empty space limit) Void fill per box: 651 in³; board per box: 5.65 ft², 11.1 oz Right-sized box (inside): 9.5 × 7.5 × 3.5 in with 0.25 in clearance per side Empty space: 24.2% inside, 40.3% outside Void fill per box: 60 in³; board per box: 2.82 ft², 5.5 oz Savings per box: 5.5 oz of board (50% less) Savings on 1,000 boxes: 347 lb of board, 342 ft³ of void fill, 383 ft³ of shipping volume, about 170 lb CO₂e Dimensional weight per box (139 in³/lb, before rounding): 7.04 lb -> 2.28 lb Planning estimate. EU PPWR (Regulation (EU) 2025/40, Art. 24) 50% empty space check; the official measuring method is still to be set. Not legal advice. Calculated with https://boxnovo.com/tools/material-waste-calculator/
Current box
About these results
- All figures are planning estimates for regular slotted cartons (RSC), calculated from the sizes and board you enter.
- The EU check compares your box with the 50% empty space limit in the Packaging and Packaging Waste Regulation. It is a guide, not legal advice.
- Board weights use typical paper grades and flute take-up factors. Type the basis weight from your board specification for a closer figure.
- Everything is calculated in your browser. Nothing you enter is saved or sent.
What is packaging material waste?
Packaging material waste is the board, void fill and shipping space used beyond what a product needs. An oversized shipping box wastes material three ways: its larger blank needs more corrugated board, its empty space has to be filled with paper, air pillows or foam, and its larger outside size raises the dimensional weight carriers charge for.
This calculator measures all three for the box you use now, then designs a right-sized box around your product and shows what it would save on every box and across a whole order.
How to calculate the empty space ratio
Empty space ratio = (box volume − product volume) ÷ box volume × 100%
Measure the product as the outer size of each item, multiply by the number of items, and compare it with the volume of the box. Anything in the box that is not the product, including void fill, counts as empty space.
Worked example
A 9 × 7 × 3 in product has a volume of 189 in³. Shipped in a 14 × 10 × 6 in box (840 in³ inside), the empty space ratio is (840 − 189) ÷ 840 = 77.5%, or 80.7% measured outside, well above the 50% EU limit. A right-sized 9.5 × 7.5 × 3.5 in box with ¼ in clearance per side is 24.2% empty (40.3% outside), uses 50% less C-flute board (5.5 oz instead of 11.1 oz) and saves about 347 lb of board and 342 ft³ of void fill on 1,000 boxes.
The EU 50% empty space rule (PPWR)
The EU Packaging and Packaging Waste Regulation, Regulation (EU) 2025/40 (PPWR), applies from 12 August 2026. Its Article 24 says that businesses filling grouped, transport or e-commerce packaging must keep the empty space ratio at 50% or less.
- When: from 1 January 2030, or three years after the Commission adopts the implementing act on the calculation method, whichever is later. The implementing act is due by 12 February 2028.
- Empty space: the difference between the volume of the packaging and the volume of the products inside it.
- Filling material counts as empty space: paper cuttings, air cushions, bubble wrap, foam fillers and polystyrene chips, for example.
- Scope: the limit does not apply to sales packaging that is also used as e-commerce packaging. Read Article 24 for the full scope and any other exemptions.
Until the measuring method is published, the calculator reports the ratio measured with both the inside and the outside size of the box. If both are at or below 50%, your box is within the limit whichever method is chosen.
How much board does a box use?
A regular slotted carton is cut from one rectangular blank: four side panels in a row plus a glue tab, with top and bottom flaps each half the box width. Measured along the middle of the board:
Blank length = 2 × (L + t) + 2 × (W + t) + glue tabBlank width = (W + t) + (H + t)Board weight = blank length × blank width × board weight per area
L, W and H are the inside length, width and height, and t is the board caliper. A box maker’s exact blank may differ by a few millimetres because of scoring allowances.
Typical combined board weight by flute
| Board | Take-up factor | Board weight | Caliper |
|---|---|---|---|
| Single wall, E-flute | 1.28 | 117.3 lb/MSF (573 g/m²) | 0.063 in (1.6 mm) |
| Single wall, B-flute | 1.36 | 119.4 lb/MSF (583 g/m²) | 0.1181 in (3 mm) |
| Single wall, C-flute | 1.48 | 122.5 lb/MSF (598 g/m²) | 0.1575 in (4 mm) |
| Single wall, A-flute | 1.56 | 124.6 lb/MSF (608 g/m²) | 0.189 in (4.8 mm) |
| Double wall, EB-flute | 1.28 + 1.36 | 194.6 lb/MSF (950 g/m²) | 0.1575 in (4 mm) |
| Double wall, BC-flute | 1.36 + 1.48 | 199.8 lb/MSF (976 g/m²) | 0.2559 in (6.5 mm) |
The take-up factor is the length of fluting medium in one length of board. Combined weight = liners + medium × take-up; the starch glue adds a little more.
Board used by common box sizes
| Inside size | Blank | Board area | Board weight |
|---|---|---|---|
| 6 × 6 × 6 in | 25.9 × 12.3 in | 2.21 ft² (0.206 m²) | 4.3 oz (123 g) |
| 8 × 6 × 4 in | 29.9 × 10.3 in | 2.14 ft² (0.199 m²) | 4.2 oz (119 g) |
| 10 × 8 × 6 in | 37.9 × 14.3 in | 3.77 ft² (0.35 m²) | 7.4 oz (209 g) |
| 12 × 9 × 6 in | 43.9 × 15.3 in | 4.67 ft² (0.434 m²) | 9.1 oz (259 g) |
| 12 × 12 × 12 in | 49.9 × 24.3 in | 8.42 ft² (0.782 m²) | 1.03 lb (468 g) |
| 14 × 10 × 6 in | 49.9 × 16.3 in | 5.65 ft² (0.525 m²) | 11.1 oz (314 g) |
| 16 × 12 × 12 in | 57.9 × 24.3 in | 9.77 ft² (0.908 m²) | 1.2 lb (543 g) |
| 18 × 18 × 18 in | 73.9 × 36.3 in | 18.6 ft² (1.73 m²) | 2.28 lb (1.04 kg) |
| 24 × 18 × 12 in | 85.9 × 30.3 in | 18.1 ft² (1.68 m²) | 2.21 lb (1 kg) |
How to reduce packaging material waste
- Right-size every box. A box built around the product cuts board, void fill and dimensional weight at the same time. Use the Box Size Calculator to turn product sizes into box sizes.
- Pack several items together. Grouped items fill a box better than single items in separate boxes.
- Turn the product. A box that holds the product on its side often needs a smaller blank because the flaps get shorter.
- Protect with fit, not fill. A snug box with an insert usually needs less material than a loose box full of void fill.
- Use the lightest board that is strong enough. Check stacking strength with the Box Strength Calculator before you move to a lighter grade.
- Keep a short range of sizes. A few well-chosen sizes cover most orders without falling back on one oversized box.
Related tools and packaging
- Custom corrugated boxesShipping boxes made to your size.
- Corrugated packagingFlutes, walls and board options.
- Box Size CalculatorWork out inside and outside box sizes.
- Dimensional Weight CalculatorSee how box size changes shipping weight.
- Box Strength CalculatorCheck the board grade you need.
- Custom Box Price CalculatorSee a typical price range for your boxes.
Packaging waste FAQ
What does a packaging waste calculator do?
It compares your product with the box you ship it in. This one shows the empty space ratio, the void fill and board each box uses, and how much a right-sized box would save per box and per order.
How do you calculate empty space in a box?
Subtract the product volume from the box volume, then divide by the box volume. A 840 in³ box holding a 189 in³ product is (840 − 189) ÷ 840 = 77.5% empty space.
What is the EU empty space ratio limit?
Under Article 24 of the EU Packaging and Packaging Waste Regulation, grouped, transport and e-commerce packaging may have at most 50% empty space, from 1 January 2030 or three years after the calculation method is adopted, whichever is later.
Does void fill count as empty space?
Yes. Under the PPWR, filling materials such as paper, air cushions, bubble wrap and foam count as empty space, so adding more void fill does not lower the ratio. Only a smaller box or more product does.
Is the ratio measured with the inside or outside size of the box?
The exact method will be set in an EU implementing act. The calculator shows both. Measured outside, the ratio is always a little higher because the board walls are included.
How do you calculate how much cardboard a box uses?
For a regular slotted carton, the blank is 2 × (L + W) plus a glue tab long and W + H wide, with one board thickness added to each dimension. Multiply its area by the board weight per square metre or per thousand square feet.
How much does a corrugated box weigh?
It depends on the size and the board. A 14 × 10 × 6 in single wall C-flute box uses about 5.65 ft² of board at about 122 lb/MSF, so it weighs roughly 11 oz.
What is a right-sized box?
A box sized to the product plus a small, deliberate clearance. It needs less board and void fill, is less likely to let the product move, and has a lower dimensional weight.
How much clearance should a shipping box have?
About ¼ in (6 mm) per side is a common starting point for sturdy products. Fragile items need more room for cushioning; enter the clearance your protection needs.
How does right-sizing lower shipping costs?
Carriers charge the higher of actual weight and dimensional weight, which is the outside volume divided by a divisor such as 139 in³/lb. A smaller box has a lower dimensional weight.
How is the carbon saving estimated?
The board saved is multiplied by FEFCO’s European average footprint for corrugated packaging, 491 kg CO₂e per tonne. It covers the board only, not void fill or transport.
Can BoxNovo make right-sized boxes?
Yes. Select Request right-sized boxes to send your report with your quote request.