A Format Book Size
An A Format book measures 110 × 178 mm (4.33 × 7.01 in). It is the UK mass-market paperback trim, the small rack size sold in supermarkets, airports and station kiosks, and the smallest common book size.
A Format measures 110 millimetres wide and 178 millimetres tall.
A Format Dimensions in Each Unit
A Format is 110 × 178 mm, which is 11.0 × 17.8 cm or 4.33 × 7.01 in.
| Unit | Width | Height | Width × height | Copy |
|---|---|---|---|---|
| Millimetres (mm) | 110 | 178 | 110 × 178 mm | |
| Centimetres (cm) | 11.0 | 17.8 | 11.0 × 17.8 cm | |
| Metres (m) | 0.11 | 0.178 | 0.11 × 0.178 m | |
| Inches (in) | 4.33 | 7.01 | 4.33 × 7.01 in | |
| Feet (ft) | 0.36 | 0.58 | 0.36 × 0.58 ft | |
| Points (pt) | 312 | 505 | 312 × 505 pt | |
| Picas (pc) | 26 | 42 | 26 × 42 pc | |
| Pixels at 72 DPI | 312 | 505 | 312 × 505 px | |
| Pixels at 150 DPI | 650 | 1051 | 650 × 1051 px | |
| Pixels at 300 DPI | 1299 | 2102 | 1299 × 2102 px | |
| Pixels at 600 DPI | 2598 | 4205 | 2598 × 4205 px |
Pixel counts follow from the resolution: pixels = millimetres ÷ 25.4 × DPI. More on the DPI and pixels page.
A Format Shape and Area
| Aspect ratio | 1 : 1.618 |
|---|---|
| Area | 0.0196 m² · 19,580 mm² |
| Diagonal | 209.2 mm · 8.24 in |
| Closest ISO size | UK rack paperback |
| Governing standard | Book trade convention (UK and US) |
A Format to Scale
Put A Format next to another size in the comparison tool.
Frequently Asked Questions
What size is an A Format paperback?
A Format is 110 by 178 mm, or about 4.33 by 7.01 inches.
Is A Format related to ISO A paper sizes?
No. A Format is a UK publishing trade name for a paperback trim. It has no connection to ISO 216 A sizes despite the letter.
What is A Format used for?
Mass-market genre fiction, travel-retail editions and cheap backlist reprints.
Book Sizes
✓ Dimensions per Publishing trade size; unit values derived by formula. Reviewed . Editorial Process →