7 × 5 × 3 in box: dimensions, dim weight and strength
A 7 × 5 × 3 in box holds 105 in³ (0.06 ft³) inside. Made in C flute its outside is about 7.31 × 5.31 × 3.47 in, which dimensional weight bills USPS at actual weight (under its threshold) and FedEx at 1 lb.
Key numbers
| Inside (L × W × H) | 7 × 5 × 3 in |
|---|---|
| Inside volume | 105 in³ · 0.061 ft³ · 1.7 L |
| Inside, metric | 178 × 127 × 76 mm |
| Perimeter 2(L + W) | 24 in |
| Length + girth, C flute OD | 24.9 in |
Outside dimensions by flute
| Board | Caliper, in | Outside, in | Outside volume, ft³ |
|---|---|---|---|
| E flute | 0.063 | 7.13 × 5.13 × 3.19 | 0.067 |
| B flute | 0.125 | 7.25 × 5.25 × 3.38 | 0.074 |
| C flute | 0.156 | 7.31 × 5.31 × 3.47 | 0.078 |
| EB double wall | 0.188 | 7.38 × 5.38 × 3.56 | 0.082 |
| BC double wall | 0.281 | 7.56 × 5.56 × 3.84 | 0.094 |
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 | 8 × 6 × 4 | n/a | n/a |
| FedEx | 139 | 7 × 5 × 3 | 1 lb | 2 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 | 325 | 195 |
| 32 ECT C flute | 364 | 218 |
| 44 ECT C flute | 500 | 300 |
| 48 ECT C flute | 546 | 327 |
| 48 ECT BC double wall | 732 | 439 |
| 61 ECT BC double wall | 930 | 558 |
| 71 ECT BC double wall | 1,083 | 650 |
Simplified McKee: BCT ≈ 5.87 × ECT × √(caliper × 24). 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 | 45 | 15 | 675 | 57.5 | 87% |
| BC double wall | 43 | 14 | 602 | 59.3 | 93% |
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: 5.3125″ along the 48″ side.
Blank size in C flute
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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