Carton Builder
Browse FEFCO-style structures, compare options, and generate a preliminary carton spec.
Learn about this toolCarton style catalog
Choose a FEFCO-style structure
Filter, compare, and open style details before configuring the carton spec.
Learn about Carton Builder
7 sections including 5 FAQs
Learn about Carton Builder
7 sections including 5 FAQs
Carton Builder is a catalog-first FEFCO-style selector and preliminary spec workspace. Browse carton, mailer, tray, folder, carrier, sleeve, and light shipper structures; compare use cases and watchouts; then configure dimensions, material family, caliper, and weight inputs for a planning-ready spec sheet. Saved specs become the primary carton records that Packaging Systems can connect to case, shipper, and pallet decisions later.
How it works
Catalog Selection
The tool starts with a curated FEFCO-style catalog instead of a hidden recommendation wizard. Search by code or use case, filter by FEFCO family, assembly method, closure, features, and material compatibility, or open the guided filter drawer when you need help narrowing options. Style cards, detail dialogs, and the compare drawer expose best-use notes, watchouts, assembly notes, material notes, complexity, and similar alternatives before you commit to a structure.
Preliminary Spec Generation
After you choose a style, enter either the finished carton inside dimensions (ID) or outside dimensions (OD). From ID, the spec workspace estimates OD; from OD, it derives ID using the selected style and material caliper. It also calculates a separate case-fit outside envelope for downstream packing, carries available basis-weight information, estimates carton tare where source data supports it, and reports loaded weight when product weight is provided. The output is a planning specification for project work, supplier discussion, PDF export, project save, Case Builder handoff, and Packaging Systems assembly.
Material Guidance
Material choices are treated as starting guidance, not certified grades. Paperboard options cover SBS, FBB, SUS/CUK carrier board, CRB/WLC, and barrier or chilled-use families with point-size caliper controls. Corrugated options cover microflute, E-flute, B-flute, and custom supplier inputs where appropriate. Final board grade, GSM/basis weight, strength rating where applicable, printability, closure performance, and manufacturing tolerances must be confirmed with your converter.
Example: FEFCO 0427 Mailer with a 6.25×4.25×2.25 in ID
Carton: 6.25" × 4.25" × 2.25" finished inside dimensions, 0.8 lb total product weight, and one unit per carton.
Use the catalog filters for ecommerce mailer, folder/wrap, no glue, self-locking closure, and high print area. Compare FEFCO 0427, 0421, and 0713, then continue with FEFCO 0427 Mailer Folder if its closure, assembly, and fulfillment constraints fit the project.
The spec workspace preserves the entered ID, estimates OD, produces a separate case-fit outside envelope for Case Builder, adds material/caliper guidance such as E-flute or microflute, and includes weight fields plus a converter validation checklist in the PDF spec sheet. If OD is the known specification instead, choose Outside (OD) and PackCalc will preserve it while deriving ID.
When to use this tool
- Browsing FEFCO-style structures when you know the general packaging job but not the exact style code
- Comparing carton, mailer, tray, folder, carrier, sleeve, and light shipper structures before supplier discussion
- Creating a preliminary carton spec from either known inside dimensions or known outside dimensions, with clearly labeled derived values
- Generating a PDF spec sheet or saving a carton item to a project for later Packaging Systems planning
- Giving Case Builder and Packaging Systems a case-fit outside envelope so downstream packing uses the physical carton size
Common mistakes to avoid
- Treating the generated spec as a production dieline. Final CAD, tooling, tolerances, glue tabs, locking geometry, and print bleeds must come from the converter
- Choosing a style by appearance alone without checking assembly method, closure, automation fit, display needs, and fulfillment speed
- Using nominal outside dimensions for downstream packing instead of the case-fit outside envelope
- Assuming a flute or paperboard point size fully defines material performance. Supplier GSM/basis weight, strength ratings, coatings, and construction vary by grade
- Skipping material compatibility watchouts for wet, chilled, heavy, high-stack, or compliance-critical use cases
Frequently asked questions
What are FEFCO codes?
FEFCO codes are an international standard system for classifying corrugated box designs, maintained by the European Federation of Corrugated Board Manufacturers. The catalog includes over 100 standardized designs organized by type: 01xx (commercial roll/sheet), 02xx (slotted containers), 03xx (telescope), 04xx (folder), 05xx (slide), 06xx (rigid), 07xx (glued), and 09xx (interior fitments). The most common is FEFCO 0201, the Regular Slotted Container (RSC). PackCalc uses these codes as structural planning references; production interpretation should be confirmed with the converter.
What changed in the redesigned Carton Builder?
The main experience is now catalog-first. You can browse, search, filter, compare, and directly choose a FEFCO-style structure instead of starting with a recommendation wizard. Guidance still appears in style notes, material compatibility, similar styles, and validation watchouts, but the user chooses the structure.
Does the Carton Builder create a production dieline?
No. The output is a preliminary planning specification. User-entered ID or OD, the corresponding derived dimensions, blank/area estimates, carton tare, and case-fit dimensions are useful for early planning, supplier discussion, and Packaging Systems assembly, but production dielines, tooling, score allowances, tolerances, print bleeds, and manufacturability must be confirmed by your carton converter.
What is the difference between paperboard and microflute/corrugated materials?
Paperboard is a solid board family commonly used for retail folding cartons, with SBS, FBB, SUS/CUK, CRB/WLC, and barrier variants. Microflute and corrugated boards include a fluted medium between liners, adding stiffness and cushioning for mailers, trays, light shippers, and stronger cartons. The right choice depends on structure, product weight, print goals, distribution exposure, and converter capability.
How does PackCalc use case-fit dimensions downstream?
When you generate a carton spec and use the Case Builder handoff, PackCalc passes the case-fit outside dimensions automatically. Saved carton specs also give Packaging Systems the primary-pack dimensions needed to connect carton, case, shipper, and pallet decisions without retyping dimensions. If you are entering data manually elsewhere, use case-fit outside dimensions when available instead of nominal outside dimensions.
Related
Guide
FEFCO Box Style Codes Explained
Guide
How Corrugated Board Works: Flutes, Liners, and Compression
Guide
Understanding Carton Materials: SBS, CUK, CRB
Guide
Carton Materials vs. Corrugated Materials
Guide
Folding Cartons: Role and Limits
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