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

A DL flyer measures 99 × 210 mm (1/3 A4) and fits a DL envelope. An 85 × 54 mm business card is credit-card size, while 90 × 50 mm is the classic Polish size.

Which size to choose?

You can price A6, A5 and DL flyers in the flyer calculator. A4 and A3 posters are in the poster calculator, larger sizes (A2, A1, A0, B2, B1 and B0) in the large-format calculator. Order 85 × 54 and 90 × 50 mm business cards in the business card calculator, and A4 and A5 brochures and catalogues in the brochure calculator.