Standard card sizes: what are the measurements?

Understand the different card sizes that come as standard for card blanks. What is size A7? What size is A6? This article gives all the card measurements.

Card sizes of A4, A5, A6 and A7 card

Like paper, there are standard sizes of card blanks available to buy, and each is given a code depending on the size of the card.


What size is A6 card? It’s understandable if you’re confused, as the names for card codes reference a card that is folded in half. Rather than reflecting the size of an unfolded piece of card, the sizes and measurements reflect the size of the folded card or the front face. For example, an A5 card when unfolded will be A4 paper size. Folding it in half pushes it up a number, so an A4 sheet of card will make an A5 card when folded in half. So what size is A7? Well, A7 is half of A6. What size is A6? Yup, you guessed it, A6 is half of A5, which is half of A4.

As with paper sizes, the smaller the number is, the bigger the card blank will be.

Whether you are going to buy card blanks to decorate yourself or make your own cards, it is good to know the common sizes of card available in the UK. Card sizes are different in the US, so it’s important not to get, for example, size A2 US mixed up with size A2 UK as they are very different sizes! This article is specifically about UK paper and card sizes.

Crafting to the standard sizes will mean it is much easier to buy envelopes for your cards and can make it cheaper to post your cards in some countries. And, if you’re following a tutorial, they might reference the size of the card in terms of A5 card, A6 card etc, so it’s useful to know now and save time wondering what size is A6.

If you would like to learn how to make cards, why not browse through some of our projects? There are lots to choose from, and you can even download some free patterned paper to get started!

What size is A6

What size is A4 card?

A4 card size is a sheet of A3 card folded in half

  • 210 x 297 mm
  • 8.3 x 11.69in

What size is A5 card?

A5 card size is a sheet of A4 card folded in half

  • 148 x 210mm
  • 5.8 x 8.3in

What size is A6 card?

A6 card size is a sheet of A5 card folded in half

  • 105  x 148mm
  • 4.1 x 5.8in

What size is A7 card?

A7 card size is a sheet of A6 card folded in half

  • 74 x 105mm
  • 2.9 x 4.1in

What size is DL card?

DL cards are longer and thinner than other card sizes and are a third of a sheet of A4

  • 210 x 99mm
  • 8.3 x 3.7 in

Envelope sizes

Envelope sizes are designed to work with card blanks with the same number.

A c5 envelope is designed to fit an A5 card, a C6 envelope will fit an A6 card and a C7 envelope will fit an A7 card. The envelopes will be slightly larger than the card so that the card can fit inside the envelope.

A DL sized card will fit inside a DL envelope.

standard card sizes envelope

Make your own envelopes

It’s easy to make your own envelopes using our free templates. You can make them super decorative or simply crated – the choice is yours. Find the free envelope template


Want to make more of envelopes in your craft project? Take a look at our glorious free vintage letter and typewriter patterned papers for more inspiration and free printable artwork.