US Letter sheets to A series
Type a value in Letter to get it in A instantly.
A3A
That's about the same as an A3 sheet. With ISO proportions that is a sheet of about 297.1 × 420.2 mm (11.7 × 16.54 in).
Convert the other way: A to Letter
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 Letter 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: 2.07 Letter = A3 A.
Every unit
That sheet in every system
Tables
Letter to A conversion table
| Letter | A |
|---|---|
| 0.0162 Letter | A10 A |
| 0.0324 Letter | A9 A |
| 0.0648 Letter | A8 A |
| 0.13 Letter | A7 A |
| 0.259 Letter | A6 A |
| 0.518 Letter | A5 A |
| 1.04 Letter | A4 A |
| 2.07 Letter | A3 A |
| 4.14 Letter | A2 A |
| 8.29 Letter | A1 A |
| 16.6 Letter | A0 A |
A to Letter conversion table
| A | Letter |
|---|---|
| A0 A | 16.5776 Letter |
| A1 A | 8.28879 Letter |
| A2 A | 4.14439 Letter |
| A3 A | 2.0722 Letter |
| A4 A | 1.0361 Letter |
| A5 A | 0.518049 Letter |
| A6 A | 0.259025 Letter |
| A7 A | 0.129512 Letter |
| A8 A | 0.0647561 Letter |
| A9 A | 0.0323781 Letter |
| A10 A | 0.016189 Letter |
Quick answers
Quick answers
- How many A is 1 Letter?
- 1 Letter is ≈A4 A.
- How many A is 10 Letter?
- 10 Letter is ≈A1 A.
- How many A is 2.07 Letter?
- 2.07 Letter is A3 A.
The units
About these units
US Letter sheets (Letter)
8.5 × 11 in (216 × 279 mm).
A series (A)
ISO A sizes: A0 is 1 m², A4 a sixteenth.
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