Paper Size Comparison
Put two paper sizes next to each other and see the exact gap: the difference in millimetres and inches, a to-scale overlay, the percentage to scale one onto the other, and whether it crops or leaves a border.
Compare Two Sizes
Pick a paper type, then a size, on each side. The comparison opens as soon as both are set.
Common Comparisons
How to Compare Two Paper Sizes
Two sizes can look interchangeable and still not be. The comparisons here give the exact gap in millimetres and inches, an overlay drawn to scale so the difference is visible, and the percentage to type into a print dialog to scale one onto the other. Where the two share the 1 : √2 proportion, as any pair of ISO A or B sizes do, one fits the other with nothing cropped. Where they do not, such as A4 and US Letter, the comparison shows how much is lost off each edge and where a border appears instead.
The list above covers the pairs people ask about most. For any other combination, pick both from the menus; the tool builds the comparison the same way.
Frequently Asked Questions
How do I compare two paper sizes?
Pick both from the menus above. The comparison shows the exact difference in millimetres and inches, a to-scale overlay diagram, the percentage to scale one onto the other, and whether one crops or borders the other.
What are the most compared paper sizes?
A4 against US Letter, A4 against A3 and A5, and A5 against A6. Those cover most of the confusion between the metric and US systems and between neighbouring sizes.
Which paper sizes scale onto each other without cropping?
Any two sizes in the ISO A or B series, because they share the 1 : √2 shape. A4 fits A3 at 141% and A3 fits A4 at 71%, both edge to edge. A4 and US Letter do not: their proportions differ.
✓ Each comparison is computed from the two sizes and their governing standards. Reviewed . Editorial Process →