Dimensional weight = (Length × Width × Height) ÷ carrier divisor, rounded up to the next whole pound. Divisors: 139 for UPS and FedEx domestic, 166 for USPS Priority Mail. You are billed on the greater of the actual scale weight and this dimensional weight.
Two free tools in one, nothing stored, all in your browser: enter your product dimensions to get a recommended box size and style, then compute the UPS, FedEx, and USPS billable weight. Accurate for the August 2025 UPS/FedEx rule change (each dimension rounded up to the next whole inch before multiplying).
Enter your product's dimensions and how much protection it needs. We add the right clearance and suggest a box style.
Enter your packed box dimensions and its actual weight to see the billable weight by carrier.
Divisors used: UPS & FedEx domestic = 139, USPS Priority = 166. Billable weight = the greater of actual and dimensional weight, rounded up to the next pound.
A ballpark unit-price range based on style, outer size, quantity, and finish. Use it to sanity-check your budget — then request an exact quote.
Estimate only. Final pricing depends on dieline complexity, print coverage, exact material grade, finishes, and freight. There are no die, plate, or setup fees on any PV order. For an exact number, request a quote above and we'll come back within one business day.
Right-sizing the box is the cheapest shipping upgrade there is — a carton that hugs the product cuts the dimensional weight you pay on every parcel. That is exactly what a custom-sized box does versus an oversized stock carton. When you're ready, get a free quote with your dimensions and we'll send a dieline and 3D mockup.
Common internal dimensions for the box styles brands order most. Use these as a starting point, then fine-tune to your product with the finder above. We make any of these as a custom size at no die or plate charge.
| Use | Internal L × W × H (in) |
|---|---|
| Small (apparel, accessories) | 6 × 4 × 2 |
| Medium (shoes, books, kits) | 9 × 6 × 3 |
| Large (multi-item, subscription) | 12 × 9 × 4 |
| Flat (apparel, prints) | 10 × 8 × 1 |
See custom mailer boxes for builds and finishes.
| Use | Internal L × W × H (in) |
|---|---|
| Small parcel | 8 × 6 × 4 |
| Cube (versatile) | 10 × 10 × 10 |
| Medium | 12 × 10 × 8 |
| Large | 16 × 12 × 12 |
See custom corrugated boxes and pick a flute below.
| Carrier / service | Divisor (in³ per lb) | Notes |
|---|---|---|
| UPS — domestic | 139 | All package sizes |
| FedEx — domestic | 139 | All package sizes |
| USPS — Priority Mail | 166 | Zones 5–9, over 1 cu ft |
| UPS / FedEx — international | 139 | Same divisor, by carrier |
Flute is the wavy inner layer of corrugated board — it sets thickness and strength. Match it to how the box ships and prints.
| Flute | Thickness | Best for |
|---|---|---|
| E-flute | ~1/16" | Retail & mailer boxes; crisp print surface |
| B-flute | ~1/8" | Lightweight shipping, food boxes, good crush resistance |
| C-flute | ~3/16" | Standard shipping cartons; cushioning + stacking |
| BC double-wall | ~5/16" | Heavy or fragile freight; maximum strength |
Dimensional weight = (Length × Width × Height) ÷ divisor, with dimensions in inches and the result rounded up to the next whole pound. Carriers bill the greater of this and the scale weight, so a light-but-bulky parcel pays for the space it takes up.
Note (effective Aug 2025): UPS and FedEx now round each dimension up to the next whole inch before multiplying — so a 7.2×5.1×3.4" box is figured as 8×6×4". This calculator applies that rule for UPS/FedEx; USPS uses the measured dimensions.
Box size = product dimensions + clearance (0.25" snug, 1" standard, 2" cushioned) on each axis. These are public carrier formulas and standard packaging clearances — accurate as of 2026; always confirm current divisors with your carrier contract.
Multiply length × width × height in inches, divide by the carrier divisor (139 for UPS/FedEx, 166 for USPS Priority), and round up to the next pound. You're billed on the greater of actual and dimensional weight.
Take your product's L × W × H and add clearance: ~0.25" for a snug retail fit, 1" for standard void fill, or 2" when it needs cushioning all around. That gives your box's internal dimensions — exactly what the finder above outputs.
Because carriers charge the greater of scale weight and dimensional weight. A bulky, low-density box is billed on volume — so right-sizing the box is the most direct way to lower cost.
Yes. Dimensional weight is volume ÷ a fixed divisor, so trimming each dimension lowers the billable weight. A custom-sized box avoids paying to ship void space inside an oversized stock carton.
Unit price depends on style, size, quantity, and finish. As a ballpark at 500 units: tuck-end product boxes run roughly $0.40–$0.90, mailer boxes $0.80–$1.80, corrugated shippers $0.50–$1.20, and rigid or magnetic-closure luxury boxes $3.50–$8.00. Prices drop sharply at higher quantities and climb with premium finishes (foil, spot UV, soft-touch). Use the price estimator above for a rough figure, then request a free quote for an exact number.