Paper Size Converter

Compare ISO and North American paper sizes in portrait or landscape, with physical dimensions and pixel dimensions at common DPI settings.

Design

Paper size converter

Compare ISO A, ISO B, and North American sheets in portrait or landscape form with physical and pixel size references.

Paper family Paper size

Orientation

A4 portrait

Metric A-series sheets scaled around a 1:1.414 aspect ratio.

Result

A4 portrait

210 x 297 mm, or 8.27 x 11.69 in, with common output DPI tables below.

Physical Dimensions

Metric	Width	Height
Millimeters	210 mm	297 mm
Centimeters	21 cm	29.7 cm
Inches	8.27 in	11.69 in

Pixel Dimensions

DPI	Width px	Height px
72 DPI	595 px	842 px
96 DPI	794 px	1,123 px
150 DPI	1,240 px	1,754 px
300 DPI	2,480 px	3,508 px

Family Reference

Size	Millimeters	Centimeters	Inches	Selected
A0	841 x 1,189 mm	84.1 x 118.9 cm	33.11 x 46.81 in	Reference
A1	594 x 841 mm	59.4 x 84.1 cm	23.39 x 33.11 in	Reference
A2	420 x 594 mm	42 x 59.4 cm	16.54 x 23.39 in	Reference
A3	297 x 420 mm	29.7 x 42 cm	11.69 x 16.54 in	Reference
A4	210 x 297 mm	21 x 29.7 cm	8.27 x 11.69 in	Current
A5	148 x 210 mm	14.8 x 21 cm	5.83 x 8.27 in	Reference
A6	105 x 148 mm	10.5 x 14.8 cm	4.13 x 5.83 in	Reference

Also in Typography & Design

Case Converter Color Converter Digital Image Resolution Converter Image Format Converter Pixels To Inches Converter Point / Pixel / mm Converter px, rem & em Converter Resolution & Print Size Helper Typography Unit Converter

Paper Reference

Paper size converter: ISO A, ISO B, Letter, Legal, and print-pixel references explained

A paper size converter helps you compare common sheet standards without hunting through separate charts. That matters when one workflow uses ISO A-series sizes such as A4 or A3, another uses North American sizes such as Letter or Legal, and a third needs quick pixel dimensions for screen previews or print exports.

How paper standards differ

ISO A-series and B-series sizes are built on consistent proportional scaling, which makes them easy to expand or reduce while preserving the aspect ratio. North American sizes such as Letter, Legal, Tabloid, and Executive follow a different standard and do not match the ISO proportions exactly.

That difference becomes important when you move layouts between regions, templates, or printers. A design that fits A4 cleanly will not map perfectly to US Letter without margin, scaling, or reflow decisions.

Physical size and pixel size are different questions

Physical size tells you the real sheet dimensions in millimetres, centimetres, or inches. Pixel size tells you how many pixels you would need to represent that sheet at a chosen DPI. Both views matter, but they answer different production questions.

For example, an A4 page has a fixed physical size. Its pixel dimensions change depending on whether you are planning a 72 DPI preview, a 150 DPI draft, or a 300 DPI print target.

pixels = inches × DPI

Used to estimate pixel width and height for a sheet at a given print density.

1 in = 25.4 mm

Core physical conversion between imperial and metric sheet measurements.

Why orientation matters

Portrait and landscape do not change the sheet itself, but they do change which edge is treated as width or height in your output. That affects layout planning, pixel export targets, and the way a page fits into a press, binder, or presentation workflow.

Using an orientation toggle is the fastest way to verify whether a design target is truly a size mismatch or simply the same sheet rotated into a different working direction.

Frequently asked questions

Is A4 the same as US Letter?

No. They are close in general purpose use, but they are not the same dimensions and they do not share the same aspect ratio. That difference can affect margins, scaling, and pagination.

Why do pixel dimensions change for the same paper size?

Because the physical sheet stays fixed while the DPI assumption changes. Higher DPI means more pixels per inch, so the pixel width and height both increase.

When should I check landscape instead of portrait?

Check landscape when the design or print workflow treats the longer edge as width rather than height. It is especially useful for slides, wide tables, folded pieces, and tabloid-style layouts.

Does this converter replace a printer template?

No. It is a sizing reference. Final production still depends on bleed, safe area, trim, printable margins, and the exact document settings required by your printer or application.

Paper Size Converter

Paper size converter

A4 portrait

Paper size converter: ISO A, ISO B, Letter, Legal, and print-pixel references explained

How paper standards differ

Physical size and pixel size are different questions

Why orientation matters

More from nearby categories

Digital Image Resolution Converter

Pixels To Inches Converter

Point / Pixel / mm Converter

Resolution & Print Size Helper