24 × 20 × 20 in box: dimensions, dim weight and strength
A 24 × 20 × 20 in box holds 9,600 in³ (5.56 ft³) inside. Made in C flute its outside is about 24.31 × 20.31 × 20.47 in, which dimensional weight bills USPS at 80 lb and FedEx at 70 lb.
Key numbers
| Inside (L × W × H) | 24 × 20 × 20 in |
|---|---|
| Inside volume | 9,600 in³ · 5.556 ft³ · 157.3 L |
| Inside, metric | 610 × 508 × 508 mm |
| Perimeter 2(L + W) | 88 in |
| Length + girth, C flute OD | 105.9 in |
Outside dimensions by flute
| Board | Caliper, in | Outside, in | Outside volume, ft³ |
|---|---|---|---|
| E flute | 0.063 | 24.13 × 20.13 × 20.19 | 5.672 |
| B flute | 0.125 | 24.25 × 20.25 × 20.38 | 5.79 |
| C flute | 0.156 | 24.31 × 20.31 × 20.47 | 5.85 |
| EB double wall | 0.188 | 24.38 × 20.38 × 20.56 | 5.91 |
| BC double wall | 0.281 | 24.56 × 20.56 × 20.84 | 6.092 |
OD ≈ ID + 2 calipers on length and width, + 3 on depth. An estimate: your box maker sets the scores. Convert other sizes.
Dimensional weight
| Carrier | Divisor | Measured, in (C) | DW, C flute | DW, BC double wall |
|---|---|---|---|---|
| USPS | 139 | 25 × 21 × 21 | 80 lb | 80 lb |
| FedEx | 139 | 24 × 20 × 20 | 70 lb | 80 lb |
DW = ⌈L × W × H ÷ divisor⌉ on outside dimensions, after each carrier's own rounding. USPS applies it only above 1,728 in³ (n/a means it bills actual weight). The carrier bills the greater of actual and dimensional weight. Divisors checked on carrier pages 2026-10-27; try your own weight.
Estimated compression strength
| Board | BCT, lbf | After 30 days storage |
|---|---|---|
| 32 ECT B flute | 623 | 374 |
| 32 ECT C flute | 697 | 418 |
| 44 ECT C flute | 958 | 575 |
| 48 ECT C flute | 1,045 | 627 |
| 48 ECT BC double wall | 1,402 | 841 |
| 61 ECT BC double wall | 1,782 | 1,069 |
| 71 ECT BC double wall | 2,074 | 1,244 |
Simplified McKee: BCT ≈ 5.87 × ECT × √(caliper × 88). The 30-day column applies Packgent's default 40% storage loss, an assumption. Estimates only; test with ASTM D642.
Pallet pattern on 48 × 40
| Board | Per layer | Layers | Boxes per pallet | Load height, in | Cube used |
|---|---|---|---|---|---|
| C flute | 2 | 2 | 4 | 46.4 | 39% |
| BC double wall | 2 | 2 | 4 | 47.2 | 40% |
Column stacked, no overhang, on a 48 × 40 in deck 5.5 in tall, loaded to 60 in overall. Those three are assumptions you can change in the pallet calculator. Pattern: 20.3125″ along the 48″ side.
Blank size in C flute
| Style | Blank, in | Board, ft² |
|---|---|---|
| 0201 RSC | 89.88 × 40.31 | 25.16 |
| 0200 HSC | 89.88 × 30.16 | 18.82 |
| 0203 FOL | 89.88 × 60.31 | 37.64 |
With one caliper allowance per score. Multiply board area by your board's combined weight (lb/MSF ÷ 1,000) for box weight, or use the box weight calculator.
Sources
- USPS Domestic Mail Manual 223 (Priority Mail prices and eligibility), section 1.4
- FedEx: What is dimensional weight?
- Flute calipers: Foster (1997), Wiley Encyclopedia of Packaging Technology
- McKee, Gander & Wachuta (1963), Paperboard Packaging 48(8)
Last reviewed . See all sources and how Packgent computes.
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