The Royal Mail size and weight guide for the UK is a handy reference of the standard dimensions of letters and parcels in the UK for when you are sending products through the post.
- Royal Mail Parcel Post Box Stuck
- Royal Mail Parcel Post Box Sizes
- Royal Mail Parcel Post Box Proof Of Postage
- Royal Mail Parcel Post Box Liverpool
- Royal Mail Parcels Tracking

Royal Mail small parcels are up to 450mm x 350mm x 160mm in size with a maximum thickness of 160mm and a weight limit of 2Kg. The small parcel size would allow you to send a candle for example in an 0201 single wall box with dimensions of 152 x 152 x 102mm. You could also send a subscription box in an 0426 die cut box (250x200x100mm). Take a look at just some of the small boxes. Royal Mail is one of the oldest postal services in the world, taking care for the mail and parcel delivery across the UK for over 500 years. It started as a system for distributing royal and governmental documents and then spread out to cater for the postal delivery needs of the entire UK population. Royal Mail is one of the oldest postal services in the world, taking care for the mail and parcel delivery across the UK for over 500 years. It started as a system for distributing royal and governmental documents and then spread out to cater for the postal delivery needs of the entire UK population. There are certain restrictions and banned items which you can't send through the post. See the full list of what items are considered 'dangerous goods'.
Knowing the size of your packaging is important as if you are sending goods in packaging that is larger than needed could cost you a lot of money in the long run.
The Royal Mail splits the level of postage charges between letters and parcels.
The two different sizes of letter are ‘Letter’ and ‘Large Letter’. There are three types of parcel size: ‘Small Parcel’, ‘Medium Parcel’ and ‘Large Parcel’.
Royal Mail Parcel Sizes – UK
Format | Max weight | Max length | Max width | Max thickness/depth |
---|---|---|---|---|
Small Parcel | 2kg | 45cm | 35cm | 16cm |
Medium Parcel | 20kg | 61cm | 46cm | 46cm |
Large parcel – via Parcelforce Worldwide | 30kg | 1.5m | 3m length and depth combined | |
Tubes | Length of the item plus twice the diameter must be less than 104cm, with the greatest dimension less than 90cm. |
Small Parcels
Royal Mail small parcels are up to 450mm x 350mm x 160mm in size with a maximum thickness of 160mm and a weight limit of 2Kg.
The small parcel size would allow you to send a candle for example in an 0201 single wall box with dimensions of 152 x 152 x 102mm. You could also send a subscription box in an 0426 die cut box (250x200x100mm).
Take a look at just some of the small boxes we offer that could be posted as small parcels by the post office.
Medium Parcels
Royal Mail Parcel Post Box Stuck
Royal Mail medium parcels are up to 610mm x 460mm x 460mm in size with a maximum thickness of 460mm and a weight limit of 20KG.
In terms of size, the boxes we recommend for 13 inch laptops would easily stay under the size limit, unless you have a lightweight laptop that weighs under 2KG, you will be charged for a medium parcel.
Large Parcels
Royal Mail large parcels are classed as bigger than 610mm x 460mm x 460mm in size or weigh in at more than 20KG.
Our double walled large boxes are ideal for transporting heavier goods being both sturdy and durable.
What is the Biggest Size Parcel the Post Office Will Take?

The biggest parcel the Royal Mail Post Office will take is one not larger than 2.5m length and 5m length and girth combined that weighs 30kg or less. Large parcels are sent via ParcelForce Worldwide.
Custom Parcel Boxes
We can produce custom sized packaging that not only will make sure you’re sending your goods in the optimal sized box but also provide your customers with a unique branding experience.
Royal Mail Letter Sizes – UK
Format | Max weight | Max length | Max width | Max thickness/depth |
---|---|---|---|---|
Letter | 100g | 24cm | 16.5cm | 5mm |
Large Letter | 750g | 35.3cm | 25cm | 2.5cm |
Royal Mail Parcel Post Box Sizes
Letter
Royal Mail letters have a maximum length of 240mm, a maximum width of 165mm with thickness up to 5mm and a weight no more than 100g.
Large Letters
Royal Mail large letters have a maximum length of 353mm, a maximum width of 250mm with thickness up to 25mm and a weight no more than 750g.
Mail lite envelopes that fit the large letter dimensions would be perfect for sending a DVD or a mobile phone as they contain bubble wrap to protect the goods and also will be cheaper to send than a box.
Royal Mail Prices
Royal Mail have produced a Business Price Guide that contains parcel and letters pricing and also details of other services such as franking and internal postage.
Personal customers and marketplace seller prices are covered by their UK and International parcel
and letter service prices guide and online UK parcel and letter price guide respectively.
Looking to end your package via DPD? We’ve also produced a guide to DPD Parcel Sizes.
The Royal Mail is introducing a wave of new-style parcel post boxes across Suffolk and Essex which means traders can send parcels 24/7.
One of the new Royal Mail parcel postboxes which are being introduced across the country, including sites in Suffolk and Essex. Picture: KATIELEE ARROWSMITH- Credit: Katielee Arrowsmith SWNS

Traders are now able to post parcels 24 hours a day, seven days a week.
These larger postboxes have wider apertures and a secure design and are intended for online customers who use the pre-paid postage system, to send or return their parcels seven days a week.
The launch of parcel postboxes is one of the biggest innovations in parcels since the launch of the parcel post in 1883, and is linked to the explosion of internet and web-based buying and selling in the UK.
Across the country 1,400 meter boxes are being converted to the new use.
One of the new parcel postboxes, designed for the use of pre-paid business customers including internet traders using the Royal Mail's Click & Drop labelling system. This parcel postbox is in Lloyds Avenue in the heart of Ipswich town centre. Picture: DAVID VINCENT- Credit: Archant
This one is in Lloyds Avenue, Ipswich in the heart of the town centre and next to the Cornhill.
Small businesses, marketplace sellers and individuals will be able to use the boxes in the same way as they post a letter, so long as they pre-paid through the Royal Mail's Click & Drop labelling system.
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Parcels must include a Royal Mail barcode on them to use the service.
Across Essex and South Anglia the first 37 boxes have been converted including CM, CO and IP postcodes, such as Bury St Edmunds, Felixstowe and Bury St Edmunds.
New Royal Mail parcel postboxes, being introduced in Suffolk, will make it easier for internet traders and customers to return parcels when pre-paid with the Royal Mail's Click & Drop system. Picture: GETTY IMAGES- Credit: Getty Images/iStockphoto
It is one of the biggest postal innovations in 160 years.
Mark Street head of campaigns at Royal Mail said: 'The introduction of parcel postboxes in the Essex and South Anglia areas means that customers can now send parcels with pre-paid postage and their returns in the same way that they do letters. The new parcel postboxes provide added flexibility to online sellers who might be running a business in their spare time and not keeping regular office hours.'
Here's where to find the new parcel postboxes
Skyliner Way, Bury St Edmnunds IP32
St Andrews Street North, Bury St Edmunds IP33
Royal Mail Parcel Post Box Proof Of Postage
Orwell House, Ferry Lane, Felixstowe IP11
Route Master, Walton Avenue, Felixstowe IP11
Farthing Road Business Box, Ipswich IP1
Goddard Road East, Ipswich IP1
Lloyds Avenue Business Box, Ipswich IP1
Hadleigh Road Industrial Estate, Ipswich IP2
Lion Barn Industrial Estate, Needham Mkt IP6
Royal Mail Parcel Post Box Liverpool
Royal Mail, Thetford IP24
Royal Mail Parcels Tracking
Meter Post, Woodbridge IP12
