B1
B-Series (ISO 216) · 7 specs
Direct Answer
B1 is an ISO 216 standard paper size measuring 707 × 1000 mm (27.83 × 39.37 inches) with a surface area of ~0.707 square meters. Defined with an exact 1-meter long edge, it is the worldwide standard format for theatrical movie posters, museum exhibition graphics, and commercial lithographic press sheets.
Source: ISO 216:2007 (DIN 476-1) · Last reviewed Aug 28, 2026
Specs
| Width × Height (Metric) | 707 × 1000 mm |
| Width × Height (Imperial) | 27.83 × 39.37 in |
| Nominal Surface Area | 0.707 m² (707,100 mm²) |
| Geometric Mean Origin | Geometric mean of A0 (841×1189 mm) and A1 (594×841 mm) |
| Defining Dimension | Long edge is exactly 1.000 meter (1000 mm) |
| Weight of 80 gsm Sheet | 56.6 grams |
| Primary Applications | Theatrical movie one-sheet posters (international), bus shelter ad kiosks, lithographic print testing |
International Cinema and Poster Standard
In European and Asian film distribution, standard cinema advertising frames are built precisely to B1 (707 × 1000 mm), providing an imposing 1-meter height that is substantially larger than A1 (594 × 841 mm) without requiring the excessive bulk of A0.
Lithographic Printing Press Standard
Most commercial 28-inch offset printing presses (such as Heidelberg Speedmaster XL 75) are engineered around B1 and B2 press sheet capacities, allowing multi-page book signatures to be printed simultaneously.