A5 Paper Dimensions – Uses, Envelope & Half Letter

08.25.2025 Paper Size Time to read: 2min
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A5 paper dimensions-01

When it comes to printer paper and everyday documents, paper size plays a crucial role. Whether you’re printing a flyer or preparing professional materials, choosing the right size can make a big difference. In this article, we’ll thoroughly delve into the topic of A5 paper, its dimensions, common uses, envelope sizes, and its US equivalent.

Definition: A5 paper dimensions

A5 paper is part of the internationally recognized A series defined by the ISO 216 standard, which is used in most countries outside of North America. The A series is based on a consistent aspect ratio of 1:√2, making it easy to scale documents up or down between sizes. This means that A5 is exactly half the size of A4, the most common printer paper size in the world.

Dimensions

The International Organization for Standardization (ISO) uses the metric system to define paper sizes under the ISO 216 standard. According to this system, A5 paper dimensions measure 14.8 × 21 cm or 148 × 210 mm, which equals 5.83 × 8.27 in, making it smaller than A4 paper dimensions.

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Envelope

International envelope sizes follow the ISO 269 standard, which means that the C series is specifically made to perfectly fit papers of the A series. As such, a C5 envelope fits an unfolded A5 paper, while a C6 envelope fits a folded A5 paper.

Uses

A5 printing is commonly utilized for the following:

  • Books
  • Booklets
  • Brochures
  • Diaries
  • Flyers
  • Greeting cards
  • Leaflets
  • Notebooks

A5 vs. Half Letter

A5 and US Half Letter are similar in size, with A5 measuring 148 × 210 mm (5.8 × 8.3 in) and Half Letter size being 140 × 215 mm (5.5 × 8.5 in). This means that A5 is slightly wider and slightly shorter than Half Letter.

A5 paper dimensions vs half letter

FAQs

A5 paper measures 14.8 × 21 cm or 148 × 210 mm, which equals 5.83 × 8.27 in.

Yes, A5 equals half of A4. If you cut A4 paper in half, you get two A5 papers.

Half Letter is similar in size to A5 because A5 measures 5.8 × 8.3 in, while Half Letter measures 5.5 × 8.5 in.

A5 paper folded in half equals A6 paper size.

By

Melissa Gertschnig

 
About the author

Melissa Gertschnig works as a Content Manager for the English market at BachelorPrint. A love for languages and other cultures has led her to become a foreign language correspondence clerk, with a primary focus on English and Spanish. This gained her a high proficiency English level in listening, writing, and reading. During her training, Melissa had been awarded a Level 2 Pearson LCCI Certificate for Business English. While working full-time, she earned her certificate in Online Marketing, which ultimately led her to BachelorPrint, where she delivers professionally written and educational content for students and curious individuals all around the world.

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Bibliography

Gertschnig, M. (2025, August 25). A5 Paper Dimensions – Uses, Envelope & Half Letter. BachelorPrint. https://www.bachelorprint.com/printing-guide/printer-paper/paper-size/a5-paper-dimensions/ (retrieved 08.29.2025)

In-text citation

Parenthetical
(Gertschnig , 2025)
Narrative
Gertschnig (2025)

Bibliography

Gertschnig, Melissa. 2025. "A5 Paper Dimensions – Uses, Envelope & Half Letter." BachelorPrint, Retrieved August 29, 2025. https://www.bachelorprint.com/printing-guide/printer-paper/paper-size/a5-paper-dimensions/.

In-text citation

Parenthetical
(Gertschnig 2025)

Bibliography

Melissa Gertschnig, "A5 Paper Dimensions – Uses, Envelope & Half Letter," BachelorPrint, August 25, 2025, https://www.bachelorprint.com/printing-guide/printer-paper/paper-size/a5-paper-dimensions/ (retrieved August 29, 2025).

Footnotes

Short note
Gertschnig, "Shortened title."

Bibliography

Gertschnig, Melissa: A5 Paper Dimensions – Uses, Envelope & Half Letter, in: BachelorPrint, 08.25.2025, [online] https://www.bachelorprint.com/printing-guide/printer-paper/paper-size/a5-paper-dimensions/ (retrieved 08.29.2025).

Footnotes

Full note
Gertschnig, Melissa: A5 Paper Dimensions – Uses, Envelope & Half Letter, in: BachelorPrint, 08.25.2025, [online] https://www.bachelorprint.com/printing-guide/printer-paper/paper-size/a5-paper-dimensions/ (retrieved 08.29.2025).
Direct quote
Gertschnig, 2025.
Indirect quote
Gertschnig, 2025.

Bibliography

Gertschnig, Melissa (2025): A5 Paper Dimensions – Uses, Envelope & Half Letter, in: BachelorPrint, [online] https://www.bachelorprint.com/printing-guide/printer-paper/paper-size/a5-paper-dimensions/ (retrieved 08.29.2025).

In-text citation

Direct quote
(Gertschnig, 2025)
Indirect quote
(Gertschnig, 2025)
Narrative
Gertschnig (2025)

Bibliography

Gertschnig, Melissa. "A5 Paper Dimensions – Uses, Envelope & Half Letter." BachelorPrint, 08.25.2025, https://www.bachelorprint.com/printing-guide/printer-paper/paper-size/a5-paper-dimensions/ (retrieved 08.29.2025).

In-text citation

Parenthetical
(Gertschnig)
Narrative
Gertschnig

Bibliography

Number. Gertschnig M. A5 Paper Dimensions – Uses, Envelope & Half Letter [Internet]. BachelorPrint. 2025 [cited 08.29.2025]. Available from: https://www.bachelorprint.com/printing-guide/printer-paper/paper-size/a5-paper-dimensions/


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