Welcome to Envelope Sizes

Envelope Sizes provide information and dimensions for envelopes around the world, suiting many different standard dimensions and types.

There are many types of envelope, dozens of different dimensions, and an array of color options available today. Knowing which one you should use is very difficult.

This website attempts to make that easier by providing the dimensions in an easy to understand format. Use the following links for more information about the sizes and their standards:

Envelope Sizes

ISO Standard Dimensions

The ISO standard measurements for envelopes consist mostly of the C-Series dimensions, such as C0, C1, C2, etc. This includes DL(Dimension Lengthwise).

Otherwise known as the ISO 269 international standard, C-series envelopes compliment paper dimensions of the ISO 216 standard(A0, A1, A2, etc). This means that a C4 enclosure will fit an A4 piece of paper inside of it. The same goes for C3 meeting the dimensions of A3, C2 meeting the dimensions of A2, etc.

American Sizes

North American Standard Envelope Sizes

North American measurements consist of many more standard dimensions across several different types mainly used in the USA and Canada. The amount of standards can be overwhelming, but they all make sense once you understand why there are so many standard dimensions.

The range of standards in North America come from a traditional background, using inches and measurement that suit the occasion, not necessarily the paper sizes available in these countries.

Types of Envelope

The Different Envelope Types

There are many different types of envelope available today, all coming with variations in color, weight, folds, materials and an array of other factors. This makes for millions of possible types.

Choosing the correct type today isn't as important as it was an age ago, but having one that uses more materials is unnecessary and can be costly if bought in bulk. Knowing the types of envelope is especially important if you want to run a company as efficiently as possible.

History of Envelopes

The first known envelope goes back roughly 3500 years. This was made from clay and was used to house valuables while they traveled between traders. Little did they know that they just invented the envelope because the definition is "a covering or containing structure or layer".

1500 years later, after paper production methods were discovered in China, folded and rolled paper was used to transport goods in hand-made wrappings. Just like paper, this method or transporting information and valuables spread west to Europe and other countries.

They continued to be handmade until the 18th century. At this time, a machine was created to cut, fold and glue the edges of paper into envelope like shapes. These shapes were made to order as no standard dimensions were in place.

At the start of the 19th century, production methods improved to create the envelope we know today. As time went on, standard dimensions were established. These standards depend on the country they were established, hence why The UK and US have different standards.

View all sizes in this chart »