Because of the aspect ratio of a sheet of A3, if you cut it directly in half along its longer side, you’ll be left with two sheets of A4. In layperson’s terms, this is best described through the relationship between A4 and A3 papers. He proposed that the ratio between the length of a page and its width should be founded in the square root of two. Rewind to 1786, when the idea of standardising the size of a letter was mooted, in a letter to the German scientist, Johann Beckmann, from his fellow countryman and physicist, Georg Christoph Lichtenberg. After developing and patenting an envelope-making machine, the classic diamond design we use today began.īefore we look at the different types of envelopes, their sizes, and uses, it’s worth knowing a little about how the paper they carry was developed. The credit goes to British inventors Warren de la Rue, and Edwin Hill. However, in the 19th Century, these paper packages started to evolve towards their more modern incarnation. Most of us are familiar with the idea of the sheets of paper, sealed with wax, that were used as envelopes during Medieval times. However, around 200 BC, they replaced the clay with paper wraps, and something close to the envelope we use today was born. Like their Babylonian counterparts, these would be broken, and the letter retrieved. As China spearheaded the development of paper, their letters were far less weighty and, instead, housed in clay spheres. While we can only pity the postmen who had to lug these around and deliver the letters to the recipient, who would then smash the clay to read what was inside.Īround the same time, the Chinese were developing similar types of envelopes for their messages.
Back then, what we might consider ‘letters’ were chiselled into stone tablets and then baked in a layer of clay. However, the first types of envelope were markedly different from those that are familiar to us today. If you need an envelope size reference, we’ve got you… C sizes are paper sizes used for envelopes, designed to take ‘A’ sized paper.Ĭ4 sized envelopes (324 x 229 mm) these are for unfolded pieces of A4 paperĬ5 sized envelopes (229 x 162mm) these take an unfolded A5 piece of paper or an A4 folded in half in portrait orientation.ĭL sized envelopes (220 x 110mm) these take an A5 folded in half in landscape orientation or an A4 folded into thirds like a concertina.Believe it or not, the humble envelope has existed for over 4,000 years, beginning with Ancient Babylon. What About Envelope Sizes? How Big Are They? Standard business cards = 85mm x 55mm including bleed that works out 91mm x 61mm We have compiled a handy list of A paper sizes with their size including bleed allowing for a 6mm bleed on all sides: What is an A1 in mm & cm?Ī1 = 841mm x 594mm including bleed that works out at 846mm x 600mmĪ2 = 594mm x 420mm including bleed that works out 600mm x 426mmĪ3 = 297mm x 420mm including bleed that works out 303mm x 426mmĪ4 = 210mm x 297mm including bleed that works out 216mm x 303mmġ/3 A4 = 98mm x 210mm including bleed that works out 104mm x 216mmĪ5 = 148mm x 210mm including bleed that works out 154mm x 216mmĪ6 = 105mm x 148mm including bleed that works out 111mm x 154mmĪ7 = 74mm x 105mm including bleed that works out 80mm x 111mmĪ8 = 52mm x 74mm including bleed that works out 58mm x 80mmĪ9 = 37mm x 52mm including bleed that works out 43mm x 58mmĪ10 = 26mm x 37mm including bleed that works out 32mm x 43mm Sizing can be tricky for paper and evnelope sizes in the UK. What Size Are "A" Paper Sizes and "C" Envelope Sizes in mm?
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