Cardboard Box Size Guide

Choosing the right dimensions for your box

At Boxtopia we will help to ensure that you buy the right sized boxes for your products

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How to measure your product

It’s important to understand the dimensions of cardboard boxes before you choose the right product for your needs. All of the boxes sold by Boxtopia have their dimensions listed in the format length x width x height – these measurements refer to the internal dimensions of the boxes to avoid confusion between single and double-walled boxes.


Measure the length, width and height of the item in millimetres.

Note: if you use bubblewrap this may add up to 20 mm to the size of the finished item, depending on how much wrap is used.


Add up to 5 mm to the length, width and height to allow for manoeuvrability. The final dimensions will be internal measurements for the box


Enter the chosen dimensions into Boxtopia’s Box Calculator or phone our office for recommendations.

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Example Boxes For Common Items

It can be difficult to visualise the size of boxes when determining which product to select or which dimensions to enter into the calculator. The chart below includes a range of items that you may wish to package, each of which is associated with an appropriately sized Boxtopia product on our website. Please note that these are examples only; our boxes can be made to bespoke sizes to ANY size you require and are suitable for all kinds of different products. We also offer custom box printing. Call us if you ever need help choosing the right size and style for your items.

Box Types


These products are only suggestions and your item may vary in size

Single Wall

0201 single wall box

102 x 102 x 102mm

A Candle

0201 single wall box

295 x 200 x 590mm

A Planter

0201 single wall box

230 x 230 x 130mm

A light fitment

Double Wall

0201 brown double wall box

254 x 235 x 254mm

A collection of small spare parts

0201 brown double wall box

406 x 406 x 406mm

A large household ornament

0201 brown double wall box

762 x 457 x 457mm

A electrical item like a speaker


0426 die cut box

135 x 93 x 45mm

A card reader

0426 die cut box

200 x 200 x 40mm

A stack of greetings cards

0426 die cut box

250 x 200 x 100mm

A subscription box


0427 die cut box

128 x 97 x 45mm

A small household ornament

0427 die cut box

152 x 152 x 89mm


0427 die cut box

320 x 320 x 70mm

A larger subscription box

Common Cardboard Box Types

You can buy 0426 boxes, 0427 boxes and both single and double wall boxes through Boxtopia’s online box shop and bespoke Box Calculator. Please note our website only gives a selection of box sizes and styles. Below, we’ve written a quick guide to each type of box.

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Single Wall Boxes

Single wall boxes are an affordable, lightweight packaging option that works for all kinds of different products. They’re not suitable for very heavy items, which are better served by a double wall box.
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Double Wall Boxes

Made from a durable 6mm layer of corrugated cardboard, our double wall boxes are durable and suitable for heavier items.
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0426 & 0427 Die-Cut Boxes

Die cut postal boxes slot together without requiring tape and are available in brown, white or black. We can print on the brown and white boxes, but they can also be personalised with branded stickers, so they are ideal for use as subscription boxes and other forms of eye-catching packaging. 0426 boxes have a lid that folds into the top of the box, whereas 0427 boxes have a lid that comes all the way over the top then folds into the side of the box.
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Choosing a box based on item weight

Although the size of your items is an important consideration when selecting the correct box, it’s also vital to think about how much they weigh. Lighter items are fine to be transported in a single wall box – in fact, doing so will be cheaper for you and better for the environment. For heavier goods, you may want to think about investing in double wall boxes.

As a general rule, items up to 10kg can be transported using a single wall box, although it does depend on the size of the box being used. For items up to 18kg, a double wall box is recommended, depending on the size of the box. If your item weighs more than 20kg, then you’ll need to look into specialist packaging methods.

Choosing a box based on item shape

In addition to size and weight, the shape of your items is worth considering when selecting an appropriate box. Boxtopia’s 0201 boxes can be filtered by long, short, square, and tall shapes, enabling you to choose the box that’s right for your item. The website only gives a small selection of sizes. We make ANY box size to order. The Boxtopia Box Calculator also allows you to input the exact size of your product to ensure that you get the right shape of box.

As noted above, we recommend leaving up to 20mm of space all around your items if you wish to add bubble wrap (depending on how much is required for your item), and no more than 5mm of extra space on each dimension for manoeuvrability. Leaving too much space and relying solely on packaging protection can result in your packages rattling and becoming damaged. Equally, transporting poorly fitting goods in large containers is not cost-effective or environmentally friendly. This is why we make bespoke boxes and work to internal dimensions.

Size Guides

Royal Mail Parcel Size Guide

We’ve put together a handy guide to Royal Mail parcel sizes. You’ll find out information such as whether the item you want to send is a large letter or a small parcel, and we’ve also included links to the latest Royal Mail prices.

Royal Mail Price Guide

ParcelForce Size Guide

ParcelForce are part of the Royal Mail and deliver parcels that are larger than the Royal Mail’s maximum sizes. Find out about the ParcelForce delivery services.

ParcelForce Price Guide

Evri Parcel Size Guide

If you’re using the very popular Hermes delivery service (now rebranded as Evri) you will want to discover how much it will cost to send your package and what charging band it falls into. You can do that by checking out our guide to Evri – Hermes parcel sizes.

Evri Price Guide

DPD Parcel Size Guide

Whether you’ve taken advantage of either DPD or DPD Local’s delivery services, you can find out about DPD parcel sizes here.

DPD Price Guide

DHL Parcel Size Guide

DHL Express have a range of parcel sizes, shipping packages up to 70kg in weight. Find out which of the DHL box sizes you need.

DHL Price Guide

Useful Guides for Boxes, Packages and Parcels

Our team would love to discuss your requirements with you. If there is any confusion at all over the type of box you require or the size you need, send us a message or pick up the phone to talk it through.

Contact us