A5 paper Size in Inches & cm

A5 paper is 148 x 210 mm, or 5.8 x 8.3 inches. It is exactly half an A4 sheet, folded or cut across the long side. It is the size of a typical notepad, a small booklet, or a diary.

This guide covers the exact A5 dimensions, where it sits between A4 and A6, and how a sheet compares to a paperback book, a tablet, and a greeting card.

Quick Answer: How Big Is A5 Paper?

A5 measures 148 x 210 mm (14.8 x 21.0 cm, 5.83 x 8.27 in). A single 80 gsm sheet weighs about 2.5 grams. It is half the area of A4 and twice the area of A6.

A5 Paper Dimensions at a Glance

• Size: 148 x 210 mm / 14.8 x 21.0 cm / 5.83 x 8.27 in
• Relationship: half of A4 (210 x 297 mm), double A6 (105 x 148 mm)
• Aspect ratio: 1:root 2, so it scales to A4 or A6 with no cropping
• Common weights: 80 gsm (2.5 g), 120 gsm (3.7 g), 160 gsm card (5 g), 250 gsm card (7.8 g)

What Does A5 Paper Look Like in Size?

A5 is the size of a standard notepad or a slim hardback diary. It is a little taller and wider than a mass-market paperback, and close to the screen-plus-bezel footprint of a 10-inch tablet. Held in one hand it covers your palm and fingers with a little overhang.

6 Everyday Comparisons for A5 Paper

1. Half an A4 sheet. Fold A4 in half across the long edge and you have A5.
2. A paperback book (typically 129 x 198 mm) is a bit smaller in both directions.
3. A 10-inch tablet (iPad, about 250 x 175 mm) is slightly larger all round.
4. A standard greeting card (flat, about 148 x 210 mm before folding) is often exactly A5.
5. Two A6 postcards (105 x 148 mm each) side by side equal one A5.
6. A US Half Letter sheet (140 x 216 mm) is close: 8 mm narrower and 6 mm taller.

A5 Paper Size in Different Units

Where A5 Fits in the A Series

The A series halves at every step: A4 to A5 to A6, each keeping the 1:root 2 shape. That means A5 artwork enlarges to A4 at 141% and shrinks to A6 at 71% with nothing cropped. A5 is the fifth cut down from A0, and the smallest size most home printers handle without a special tray.

Common Mistakes When Comparing A5 Paper

1. Assuming A5 is half the length of A4. It is half the area. A5’s long side (210 mm) is A4’s short side.
2. Confusing A5 with US Half Letter. Half Letter is 140 x 216 mm, a different shape.
3. Thinking a paperback is “A5 size”. Most paperbacks are a little smaller (around 129 x 198 mm).
4. Ignoring orientation. A5 can be portrait or landscape; the size is the same.
5. Using low DPI for print pixels. A5 at 300 DPI is 1748 x 2480 px; at 72 DPI it is only 420 x 595 px.

Frequently Asked Questions

How big is A5 paper in cm?

14.8 x 21.0 cm.

How big is A5 in inches?

5.83 x 8.27 inches.

Is A5 half of A4?

Yes. Two A5 sheets equal one A4.

Is A5 the same as a paperback book?

Close, but most paperbacks are slightly smaller, around 129 x 198 mm.

How much does an A5 sheet weigh?

About 2.5 g at 80 gsm.

What is A5 used for?

Notepads, diaries, invitations, flyers, booklets, and greeting cards.

How do I scale A5 to A4?

Enlarge to 141%; the proportions match exactly.

Final Takeaway

A5 paper is 148 x 210 mm (5.83 x 8.27 in) and weighs about 2.5 grams per 80 gsm sheet. It is exactly half an A4 sheet, keeps the same 1:root 2 shape so it scales cleanly, and is the everyday size of notepads, diaries, and greeting cards.