Free Packaging Tools You’ll Actually Use
Size the box, check dimensional weight, pick board weight, fit a mylar bag, generate a QR or barcode — all in your browser. No login, no email gate, nothing you type leaves your device.
Every tool, by the question it answers
| Your question | Tool |
|---|---|
| What will a carrier bill me for this box? | Box size & dimensional weight calculator |
| How much space will my order take up? | Box volume & cubic feet calculator |
| How many cartons fit on a pallet or container? | Pallet & container load calculator |
| How strong is this corrugated box when stacked? | Corrugated compression calculator |
| What weight of board am I being quoted? | Paper weight chart & converter |
| Which standard size is closest to my product? | Standard box sizes chart |
| Which mylar bag size fits what I’m filling? | Mylar bag size finder |
| What cc absorber goes in that bag? | Oxygen absorber calculator |
| I need a scannable QR on the pack | QR code generator |
| I need a barcode image for a code I hold | Barcode generator |
| Which sustainable material fits my product? | Eco material selector |
| Need more reference material? | Research & packaging guides |
| Can an AI agent search and quote packaging? | For AI agents & developers |
Box Size & Dimensional Weight Calculator
Carriers bill on the greater of actual weight vs dimensional weight. Enter your box dimensions to see both.
Box Volume & Cubic Feet Calculator
Convert box dimensions into cubic inches, cubic feet, liters and CBM.
Pallet & Container Load Calculator
Enter carton size and weight. Get cartons per layer, layers per pallet and container fit.
Corrugated Box Compression Calculator
Estimates stacking strength using a simplified McKee formula.
Paper Weight Chart & Converter
Convert between GSM, points and approximate thickness.
| Common name | Point | GSM (approx) | Typical use |
|---|---|---|---|
| Thin folding carton | 12pt | ~250 gsm | Light cosmetic / retail |
| Standard folding carton | 16pt | ~350 gsm | Most retail cartons |
| Heavy folding carton | 18–20pt | ~400–450 gsm | Premium / food cartons |
| Extra heavy SBS | 24pt | ~500+ gsm | High-end cosmetics |
| Single-wall corrugated | — | ~125–175 gsm/liner | Shipping boxes, mailers |
| Double-wall corrugated | — | ~150–200 gsm/liner | Heavier freight |
Standard Box Sizes Chart
Common mailer, shipping and shoe box sizes.
| Size (in) | Category | Typical use |
|---|---|---|
| 6 × 4 × 4 | Extra small | Jewelry, small electronics |
| 8 × 6 × 4 | Small | Books, cosmetics, compact retail |
| 12 × 10 × 8 | Medium | Most common e-commerce size |
| 16 × 12 × 8 | Large | Bundled items, larger apparel |
| 20 × 16 × 12 | Extra large | Bulky items, multi-item kits |
| 13 × 8.5 × 4.5 | Shoe box (std) | Adult sneakers |
| 14 × 10 × 6 | Shoe box (boot) | Boots / tall footwear |
| 8.69 × 5.44 × 1.75 | USPS Flat Rate Small | USPS Priority |
| 11.25 × 8.75 × 6 | USPS Flat Rate Medium | USPS Priority |
Mylar Bag Size Finder
Tell it the fill weight and density. It suggests a bag size that should seal cleanly.
Oxygen Absorber Calculator
Enter container/bag size and how densely product packs. Get a recommended cc rating.
QR Code Generator
Turn any URL into a high-resolution QR code. Drawn in your browser — nothing sent to a server.
Barcode Generator
Create a print-ready barcode (UPC-A, EAN-13, Code 128, Code 39, ITF-14). Nothing leaves your browser.
Eco-Friendly Material Selector
Answer a few questions. Get a practical starting material based on weight, fragility, moisture and print needs.
Research & Packaging Guides
Short references when you need more than a calculator.
Shipping Box Types & Sizes
Full shipping box size chart and type overview for mailers, cartons and freight.
View guide →How Much Do Custom Boxes Cost?
What usually drives unit cost up or down — quantity, board, print and finish.
Read pricing guide →Complete Packaging Guide
Types, materials, and cost overview for custom packaging boxes.
Read full guide →For AI Agents & Developers
We’re opening the same surfaces so an AI assistant can help with sizing and quote requests.
Agentic Commerce
How an AI agent can move from a product question to a clean quote request.
Learn more →Integrations
MCP server, machine-readable notes, llms.txt and the free browser tools.
View integrations →What still needs a human: final custom pricing, dieline approval, and production sign-off.
Got Your Numbers? Get a Real Quote
Take whatever you worked out above — size, weight, material, quantity — and send it straight in. A person replies with real pricing, no minimum order required.
Need a number a calculator can’t give you?
Phone: +1 (925) 291-3420
Quote form: primecustomboxes.com/quote/
