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International packaging size standards: ISO 216 paper, ISO container sizes, US vs EU box rules. Cross-border shipping caps for global brands. At Discount Box Printing, we make custom packaging boxes to any size, factory-direct across the United States. This guide covers sizes, tips. Cost points so you pick right the first time.
What are international packaging size standards?
International packaging follows ISO 216 for paper (A4 = 210 × 297 mm), ISO 668 for shipping containers (20 ft, 40 ft). Country-specific carton rules. US uses inches and dim divisor 139. EU uses mm and divisor 5000. At Discount Box Printing we make any size factory-direct from $0.10 per unit. Beat any box quote.
- ISO 216: paper A0–A10 series
- ISO 668: shipping containers 20 ft, 40 ft
- US unit: inches
- EU unit: mm (metric)
- US dim divisor: 139
- EU dim divisor: 5000 (kg cbm)
- USPS max L: 108 in
- EU parcel max L: 175 cm
ISO 216 Paper Sizes
ISO 216 defines the A-series paper sizes used across Europe and most of the world. A4 is 210 × 297 mm. A5 is 148 × 210 mm. A3 is 297 × 420 mm. Each size is half the next larger one. The US uses Letter (8.5 × 11 in) instead, which does not match A4. item literature for global brands often needs both.
Shipping Container Standards (ISO 668)
Global freight uses ISO 668 shipping containers. A 20 ft container holds 20 × 8 × 8.5 ft. A 40 ft container holds 40 × 8 × 8.5 ft. A 40 ft High Cube adds 1 ft of height. Palletized cargo inside follows Euro-pallet (1200 × 800 mm) or US pallet (48 × 40 in) sizes.
US vs EU Box rules
US packaging is spec\u2019d in inches (L × W × H). EU packaging is spec\u2019d in millimeters (L × W × H). US uses ECT for corrugated strength (32, 44, 51). EU uses BCT (Box Compression Test) in kg or Mullen burst strength. Convert 1 in = 25.4 mm for cross-border spec sheets.
Cross-Border Shipping Caps
USPS caps parcels at 108 in length and 130 in length plus girth. UPS and FedEx cap length at 108 and length plus girth at 165. DHL Europe caps parcels at 175 cm length and 300 cm length plus girth. Royal Mail UK caps at 150 cm length. Match your box design to the tightest cap in your shipping lanes.
International Dim Weight math
US shippers bill dim as (L × W × H in inches) / 139. EU shippers bill as (L × W × H in cm) / 5000, giving kg. UK Royal Mail uses / 6000. Convert your box size to the local math before you estimate shipping cost for a global market.
Country-Specific Labeling Rules
EU packaging needs CE marking for regulated goods and multi-lingual ingredient lists per EU food labeling rules. UK adds UKCA marking post-Brexit. Canada needs English and French labels. Japan uses PSE marking for electronics. Plan label panels for every target market.
Common Global Sizing Mistakes
Assuming A4 fits a US Letter mailer — A4 is 12 mm taller. Missing UKCA marking on UK-bound electronics. Using US pallet size (48 × 40 in) on Euro-container loads that expect 1200 × 800 mm pallets. Miscalculating dim weight with the wrong divisor.
Sizes & Dimensions Chart
International standards for paper, containers, pallets, and parcel caps.
| Use case | top Size (L × W × H) | Best Fit |
|---|---|---|
| A4 paper (ISO) | 210 × 297 mm | EU + global top |
| US Letter | 8.5 × 11 in | US only |
| 20 ft container | 20 × 8 × 8.5 ft | Ocean freight |
| 40 ft container | 40 × 8 × 8.5 ft | Ocean freight |
| Euro pallet | 1200 × 800 mm | EU freight |
| US pallet | 48 × 40 in | US freight |
| Parcel max L (EU/DHL) | 175 cm | EU parcel cap |
Wholesale Cost and Ordering
Custom sizes cost the same as stock sizes in bulk. So there is no reason to force an item into a poor fit. We make the boxes ourselves. Means no reseller markup and no setup fee. Low MOQs let you test a size before you scale. Send a rival quote through Beat My Quote and we will try to come in lower.
- Request a free quote. Share the size, the style, the print, and the count.
- Get a free proof. Our team preps a dieline and a 3D mockup at no cost.
- Approve and we print. We build factory-direct after sign-off.
- Free US delivery. Your boxes ship to your door in 10 to 12 days.
Explore More
- Shipping Box Size Chart — US shipper caps.
- top Packaging Box Dimensions — by field.
- Packaging Dimensions Calculator — dim math.
- How to Measure Packaging Dimensions — measuring 101.
- Beat My Quote — global-brand pricing.
Frequently Asked Questions
What is the international standard paper size?
ISO 216 A-series is the international standard for paper. A4 is 210 by 297 mm, used in Europe, UK, Asia, and most of the world. The US uses Letter (8.5 by 11 in) instead. Product literature for global brands often needs both.
What size are shipping containers?
ISO 668 defines global shipping container sizes. A 20 ft container holds 20 by 8 by 8.5 ft. A 40 ft container holds 40 by 8 by 8.5 ft. A 40 ft High Cube adds 1 ft of height for lighter cargo that fills the volume before the weight cap.
How do I convert US box sizes to metric?
Multiply inches by 25.4 to get millimeters. So a 12 by 9 by 4 in box is 305 by 229 by 102 mm. Round to the nearest 5 mm for a clean spec that suppliers can build to standard EU tooling.
What is the EU dim weight formula?
EU carriers bill dim as (Length x Width x Height in cm) divided by 5000, giving weight in kg. UK Royal Mail uses divisor 6000. US carriers use inches divided by 139. Convert to the local formula before quoting shipping cost.
What is the max parcel size for EU shipping?
DHL Europe caps parcels at 175 cm length and 300 cm length plus girth. Royal Mail UK caps at 150 cm length. Match your box design to the tightest cap in your target shipping lanes for the widest carrier network access.
Do I need special labels for international shipping?
Yes. EU needs CE marking for regulated goods and multi-lingual ingredient lists. UK adds UKCA marking post-Brexit. Canada requires English and French labels. Japan uses PSE marking for electronics. Plan label panels for every target market before print.
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