B series to A series
Type a value in B to get it in A instantly.
≈A4A
That's 1.41× as big as an A4 sheet, while an A3 sheet is 1.41× bigger. With ISO proportions that is a sheet of about 250 × 353.6 mm (9.843 × 13.92 in).
What it means
How big is that sheet?
ISO 216 sizes are rounded to whole millimeters on real sheets. US sizes are compared by area; their proportions differ from √2.
The math
How to convert B to A
Area of A n = 2^−n m²; B n = 2^(½−n) m², C n = 2^(¼−n) m². Sides are in the ratio 1 : √2.
Example: B4 B = ≈A4 A.
Every unit
That sheet in every system
Tables
B to A conversion table
| B | A |
|---|---|
| B1 B | ≈A1 A |
| B2 B | ≈A2 A |
| B3 B | ≈A3 A |
| B4 B | ≈A4 A |
| B5 B | ≈A5 A |
| B6 B | ≈A6 A |
| B7 B | ≈A7 A |
| B8 B | ≈A8 A |
| B9 B | ≈A9 A |
| B10 B | ≈A10 A |
| B11 B | ≈A11 A |
A to B conversion table
| A | B |
|---|---|
| A0 A | ≈B1 B |
| A1 A | ≈B2 B |
| A2 A | ≈B3 B |
| A3 A | ≈B4 B |
| A4 A | ≈B5 B |
| A5 A | ≈B6 B |
| A6 A | ≈B7 B |
| A7 A | ≈B8 B |
| A8 A | ≈B9 B |
| A9 A | ≈B10 B |
| A10 A | ≈B11 B |
Quick answers
Quick answers
- How many A is B1 B?
- B1 B is ≈A1 A.
- How many A is B10 B?
- B10 B is ≈A10 A.
- How many A is B4 B?
- B4 B is ≈A4 A.
The units
About these units
B series (B)
ISO B sizes, between the A sizes; posters and passports.
A series (A)
ISO A sizes: A0 is 1 m², A4 a sixteenth.
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