How Much Is a Large Letter Postage Stamp?
Current UK large letter stamp prices for first and second class, plus size rules and cheaper alternatives.
Current large letter stamp prices
Royal Mail sets stamp prices each year, usually in April. Large letter stamps cost more than standard letter stamps because they cover items that are bigger, thicker, or heavier than a standard letter.
Quick answer
A first class large letter stamp costs £1.19 and a second class large letter stamp costs 93p (as of April 2025, up to 100g). Large letters can be up to 353mm x 250mm x 25mm thick and weigh up to 750g. Heavier items cost more depending on the weight band. Always check the Royal Mail website for the latest prices before posting.
Large letter size and weight rules
Royal Mail classifies mail into three main categories: letter, large letter, and small parcel. Anything that exceeds the standard letter dimensions but stays within large letter limits falls into this middle category.
Common items that fit the large letter size include A4 documents in a C4 envelope, greetings cards larger than standard, magazines, thin books, and clothing items like t-shirts. If you are sending anything that feels bulky or rigid, measure it carefully - going even slightly over the 25mm thickness limit pushes your postage up to the small parcel rate.
Need to know about standard stamps too? See how much a second class stamp costs or find out how many stamps come in a book.
Weight band pricing
The base large letter stamp price covers items up to 100g. If your large letter weighs more, you need to pay the rate for the correct weight band. You can either buy a stamp for the right weight or pay at the Post Office counter.
This is what a standard large letter stamp covers. First class £1.19, second class 93p. Most greetings cards and thin documents fall within this band.
Heavier large letters in this band cost around £1.67 first class and £1.30 second class. Magazines and thin books often fall into this range.
At this weight you are looking at around £2.10 first class and £1.65 second class. Thicker books and multi-page documents reach this weight.
The heaviest large letters cost roughly £2.60 first class and £2.05 second class. Above 750g the item must go as a small parcel regardless of size.
Where to buy large letter stamps
You can purchase large letter stamps from several places. The Post Office is the most reliable option, but they are increasingly available elsewhere too.
Places to buy large letter stamps0 / 5 checked
Ways to save on large letter postage
Postage costs add up quickly if you send a lot of mail. Here are practical ways to keep your large letter costs down.
Wondering when prices will change? Read about when postage stamps will go up or check if there is VAT on postage.
Large letter packaging that fits
Our large letter postal boxes and rigid mailers are designed to the Royal Mail large letter size limits, helping you avoid paying small parcel rates.
Browse large letter boxesFrequently asked questions
A first class large letter stamp costs £1.19 (as of April 2025) for items up to 100g. Heavier large letters cost more, with rates increasing by weight band.
A second class large letter stamp costs 93p (as of April 2025) for items up to 100g. This is the cheapest way to post a large letter with Royal Mail.
A large letter can be up to 353mm x 250mm x 25mm thick and weigh up to 750g. Anything bigger or heavier than this becomes a small parcel.
You can use multiple stamps to make up the value, but you need to reach the correct large letter rate. Using standard letter stamps will usually cost more than buying a large letter stamp directly.
Large letter stamps are available at Post Office branches, some supermarkets, newsagents, and online through the Royal Mail website.
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