What is the size of A4 in cm?

A4 measures 21.0 × 29.7 cm, i.e. 210 × 297 mm. It is the most common office size — printer paper, letterheads, catalogues and price lists. Folded in half it gives A5 (14.8 × 21.0 cm), and two A4 sheets side by side make A3.

What is the difference between A-series and B-series sizes?

B sizes are larger than the matching A sizes — each falls between two consecutive A sizes. For example B2 (500 × 707 mm) sits between A2 and A1. In printing, the B series is the poster standard: B2 and B1 are printed most often.

DL measures 99 × 210 mm — exactly 1/3 of an A4 sheet. It is the most popular flyer size because it fits a standard DL envelope and leaflet stands. The name stands for "Dimension Lengthwise".

Which size should I choose for a poster?

Posters are most often printed in B2 (500 × 707 mm) for interiors and shop windows, and B1 (707 × 1000 mm) for advertising columns and notice boards. Smaller A3/A2 work well as info posters. You can price them in the barwa.pl poster calculator without giving an e-mail.

Paper sizes — dimensions in mm and cm (A, B, DL series)

Published: 14 lipca 2026

Dimension table of all A-series, B-series and DL paper sizes — in millimetres and centimetres.

A-series and B-series paper sizes are defined by ISO 216: the largest sheet A0 measures 841 × 1189 mm, and each next size (A1, A2, A3…) is made by halving the longer side. B sizes are intermediate and larger than the matching A sizes — e.g. B1 (707 × 1000 mm) is larger than A1 (594 × 841 mm).

A-series — dimensions

Size	Dimensions in mm	Dimensions in cm
A0	841 × 1189 mm	84,1 × 118,9 cm
A1	594 × 841 mm	59,4 × 84,1 cm
A2	420 × 594 mm	42,0 × 59,4 cm
A3	297 × 420 mm	29,7 × 42,0 cm
A4	210 × 297 mm	21,0 × 29,7 cm
A5	148 × 210 mm	14,8 × 21,0 cm
A6	105 × 148 mm	10,5 × 14,8 cm
A7	74 × 105 mm	7,4 × 10,5 cm

B-series — dimensions

Size	Dimensions in mm	Dimensions in cm
B0	1000 × 1414 mm	100,0 × 141,4 cm
B1	707 × 1000 mm	70,7 × 100,0 cm
B2	500 × 707 mm	50,0 × 70,7 cm
B3	353 × 500 mm	35,3 × 50,0 cm
B4	250 × 353 mm	25,0 × 35,3 cm
B5	176 × 250 mm	17,6 × 25,0 cm

Other common print sizes

DL — 99 × 210 mm (1/3 A4 flyer, fits a DL envelope),
business card 85 × 54 mm — credit-card size,
business card 90 × 50 mm — classic size.

Which size to choose?

Flyers: A6, A5, DL — flyer calculator,
Posters: B2, B1, A1 — poster calculator and large-format calculator,
Business cards: 85 × 54 or 90 × 50 mm — business card calculator,
Brochures and catalogues: A4, A5 — brochure calculator.