How to compare A4 and Letter paper
Choose a size and quantity to see area and weight.
1
Pick the paper size
Select A4, Letter or another common size.
2
Enter the sheet count
A ream is normally 500 sheets.
3
Compare the area
The percentage shows how the selected sheet compares with US Letter.
What does this tool do?
A4 is 210 × 297 mm and US Letter is 8.5 × 11 inches (215.9 × 279.4 mm). They are close in area but not interchangeable when a printer or binder expects an exact size.
The Formula
Area = width × height; sheet weight = area (m²) × 80 g/m²Frequently Asked Questions
Is A4 the same as US Letter?
No. A4 is 210 × 297 mm, slightly narrower and longer than US Letter at 215.9 × 279.4 mm.
Does A4 fit in a Letter binder?
A4 is taller, so it may overhang a Letter-size sleeve. The hole spacing also differs from a standard US three-ring binder.