Free Packaging Tools: Dieline, Box Sizing, Mylar, QR and Barcodes
Build a dieline, size the box, pick the board, fit the mylar bag, print the code. Every tool runs in your browser — no login, no email.
Free to use. No login. Nothing you type leaves your browser.
| Your question | Tool |
|---|---|
| Can I preview a flat dieline and 3D box? | Custom box dieline generator |
| 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 |
| Can an AI agent search and quote packaging? | For AI agents & developers |
Custom Box Dieline Generator
Select a box style, enter your size, and preview the box flat and folded. 3D needs its own page so WebGL can load.
↑ Back to all toolsBox Size & Dimensional Weight Calculator
Enter the box size and actual weight. Carriers compare actual weight with DIM weight (L × W × H ÷ divisor) and bill the higher one.
Example: 12 × 9 × 4 in = 432 cu in ÷ 139 ≈ 3.1 lb DIM weight. Always confirm the divisor with your carrier. See our shipping box types & sizes guide.
↑ Back to all toolsBox Volume & Cubic Feet Calculator
Get cubic inches, cubic feet, liters and CBM per box, the total for your order, and how many boxes fit a 20 ft, 40 ft or 40 ft high-cube container.
Cubic feet = L × W × H (in) ÷ 1,728. CBM = cubic feet × 0.028317. Container volumes used: 20 ft 33.2 CBM, 40 ft 67.7 CBM, 40 ft HC 76.4 CBM.
↑ Back to all toolsPallet & Container Load Calculator
Enter the carton’s outside size and weight, pick a pallet and stack height. Get cartons per layer, layers, cartons per pallet, loaded weight, and pallets and cartons per container.
Uses whole cartons only, no overhang, tests both orientations. Pallet deck height 5.5 in and pallet weight about 40 lb are included. Container counts assume single-stacked loading. Confirm with your freight forwarder before booking.
↑ Back to all toolsCorrugated Box Compression Calculator
Estimate top-to-bottom compression strength (BCT) of an empty single-wall corrugated box with the simplified McKee formula. Keep every length in the unit system you choose.
BCT = 5.874 × ECT × h0.508 × Z0.492, where h is board caliper and Z is perimeter, 2 × (L + W). Not adjusted for humidity, stacking time, hand holes, pallet gaps or contents. Validate the production box with a physical test such as ASTM D642.
↑ Back to all toolsPaper Weight Chart & Converter
Type in any box and the other three update instantly.
GSM ÷ 25 = points · GSM × 0.2656 = lbs (25 × 38 in basis) · points × 0.0254 = mm. Approximate for typical SBS board; real caliper depends on board bulk.
| Points (pt) | GSM | Lbs (per ream) | Thickness (mm) | Typical use |
|---|---|---|---|---|
| 10 pt | 250 gsm | 65 lb | ~0.25 mm | Folding cartons, lightweight boxes |
| 12 pt | 300 gsm | 80 lb | ~0.30 mm | Standard product boxes |
| 14 pt | 350 gsm | 90 lb | ~0.36 mm | Premium retail, cosmetics |
| 16 pt | 400 gsm | 100 lb | ~0.41 mm | Sturdy product packaging |
| 18 pt | 450 gsm | 110 lb | ~0.46 mm | Heavy retail, electronics |
| 20 pt | 500 gsm | — | ~0.51 mm | Premium / food cartons |
| 24 pt | 600 gsm | 150 lb | ~0.61 mm | Rigid setup wraps, luxury |
| Corrugated flute | Thickness | Typical use |
|---|---|---|
| E-flute | ~1.5 mm (1/16 in) | Retail mailers, displays |
| B-flute | ~3.0 mm (1/8 in) | Die-cut boxes, inner packs |
| C-flute | ~4.0 mm (5/32 in) | Most shipping boxes |
| A-flute | ~5.0 mm (3/16 in) | Heavy-duty, fragile items |
| BC double-wall | ~6.5 mm (1/4 in) | Heavy / palletized freight |
Confirm caliper on the quote. Full reference: paper weight chart.
↑ Back to all toolsStandard Box Sizes Chart
Enter your product size to find the smallest standard box it fits, or scan the chart below. Sizes are inside dimensions in inches.
| Size (in) | Category | Typical use |
|---|---|---|
| 6 × 4 × 4 | Extra small | Jewelry, small electronics |
| 6 × 6 × 6 | Small cube | Candles, mugs |
| 8 × 6 × 4 | Small | Books, cosmetics, compact retail |
| 9 × 6 × 3 | Small mailer | Skincare sets, accessories |
| 10 × 8 × 4 | Medium mailer | Apparel, subscription boxes |
| 12 × 9 × 4 | Medium mailer | Folded apparel, gift sets |
| 12 × 10 × 8 | Medium | Most common e-commerce size |
| 12 × 12 × 12 | Medium cube | Home goods, bundles |
| 16 × 12 × 8 | Large | Bundled items, larger apparel |
| 18 × 18 × 18 | Large cube | Moving, bulky items |
| 20 × 16 × 12 | Extra large | Bulky items, multi-item kits |
| 24 × 18 × 18 | Extra large | Large kits, bedding |
| 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 |
| 12.25 × 12.25 × 6 | USPS Flat Rate Large | USPS Priority |
Mylar Bag Size Finder
Pick what you are packing and the amount to get a starting bag size, from 1 gram to 1 pound.
| Amount (flower) | Typical bag size (W × H) |
|---|---|
| 1 g | 2.5 × 4 in |
| 3.5 g (eighth) | 3 × 4.5 to 4 × 6 in |
| 7 g (quarter) | 4 × 6 to 5 × 7 in |
| 14 g (half oz) | 5 × 8 in |
| 28 g (1 oz) | 6 × 9 in |
| 112 g (quarter lb) | 8 × 12 in |
| 448 g (1 lb) | 12 × 16 in |
Sizing aid only. Density and closure shift the exact size — confirm with a physical sample. Smell-proof and child-resistant are design targets; verify compliance for your market.
↑ Back to all toolsOxygen Absorber Calculator
Enter your bag size and what you are storing. The result is rounded up to standard absorber sizes (100, 300, 500, 1000, 2000 cc).
Method: bag capacity × food-type air factor × 21% oxygen, rounded up. Round up, never down — extra absorption does not harm dry food. Storage aid only, not a shelf-life guarantee.
↑ Back to all toolsQR Code Generator
Drawn in your browser. Nothing sent to a server. Download a high-resolution PNG for print.
Leave a clear quiet zone around the code, print it at least 0.8 in (2 cm) wide, and test a printed proof.
↑ Back to all toolsBarcode Generator
UPC-A, EAN-13, Code 128, Code 39, ITF-14. This draws the image only — it does not issue a GS1 number.
UPC-A = 11 or 12 digits · EAN-13 = 12 or 13 digits · ITF-14 = 13 or 14 digits · Code 39 = uppercase letters, numbers, – . $ / + % and space. Black bars on white scan best.
↑ Back to all toolsEco-Friendly Material Selector
Compare kraft, SBS paperboard, recycled corrugated, rigid board and molded pulp by product type, weight, fragility, moisture and brand look.
Use FSC, recyclable or compostable wording only when the exact material, finish and certification support it. See our pricing guide.
↑ Back to all toolsResearch & Packaging Guides
Short references when you need more than a calculator.
For AI Agents & Developers
Live pages only. No public MCP server yet — agents should read these, then send the buyer to a human quote.
What still needs a human: final custom pricing, dieline approval, production sign-off.
Got Your Numbers? Get a Real Quote
Size, weight, material, quantity — send it in. A person replies with real pricing. No minimum order.
Need a number a calculator can’t give you?
Phone: +1 (925) 291-3420
Quote form: primecustomboxes.com/quote/
