Sources and data
Packgent publishes a value only when it can link to where it came from. These are the sources, grouped by what they support.
Carrier dimensional weight
- USPS Domestic Mail Manual 223 (Priority Mail prices and eligibility), section 1.4; USPS Domestic Mail Manual 253 (Parcel Select prices and eligibility), section 1.2. Used on USPS dim weight.
- FedEx: What is dimensional weight?. Used on FedEx dim weight.
Checked 2026-10-27. Re-checked every January and July and on any announced rate change. UPS is not listed: its page refused automated access when checked.
Flutes
- Foster, G. (1997). "Boxes, Corrugated." In Brody & Marsh (eds.), The Wiley Encyclopedia of Packaging Technology, 2nd ed. Wiley. ISBN 0-471-06397-5 (table reproduced in Wikipedia, "Corrugated fiberboard")
- Packaging Corporation of America: Profiles with a purpose
Checked 2026-10-27. Multi-wall calipers are the sum of their single-wall plies, which is Packgent's own approximation. See flutes.
Box styles
- Fibre Box Association, "Box Styles Basics" (2014), hosted by IoPP: the code-to-name mapping for every style.
- FEFCO: The FEFCO Code (International Fibreboard Case Code), 12th edition: the code system itself. Packgent's style descriptions and dielines are its own work and do not reproduce FEFCO's text or drawings.
Checked 2026-10-27. See box styles.
Test standards
Titles and scopes of 32 procedures from ISTA, ASTM, TAPPI, each linked from its standard page to the publisher. Checked 2026-10-27.
Formulas
McKee, R. C., Gander, J. W. and Wachuta, J. R. (1963), "Compression strength formula for corrugated boxes", Paperboard Packaging 48(8): 149–159. Packgent uses the widely published simplified form; see method.
Not yet published
NMFC Item 222 and UFC Rule 41 construction tables, ECT-to-burst correspondence, NMFC density classes, board basis weights and UPS's divisor are waiting on a primary source. Pages that depend on them are marked not for indexing and say so. Read the ECT vs Mullen guide for background.