Paper & DPI
Print size and pixel calculator
Input
Result
- Pixels
- Millimetres
- Inches
- Total pixels
Enter a size yourself
Everything is calculated in your browser. What you type is never sent to a server or stored.
How to use
Links paper size, resolution (DPI) and pixel dimensions. See how many pixels an A4 page needs at 300DPI, or how large your photo can be printed before it softens. Nothing is uploaded.
When to use it
- Finding the pixel size a print shop expects.
- Checking how big a photo can print and stay sharp.
- Moving between millimetres, inches and pixels while you work.
How to use it
- Choose a paper size (A4, A3, postcard and so on) and the orientation.
- Pick a DPI from the presets or type your own.
- Millimetres, inches, pixels and the total pixel count appear together.
- For a size that is not listed, enter the width and height in custom size.
Good to know
- DPI means dots per inch. 300DPI is the usual print standard, 150DPI suits large prints viewed from a distance, and 72–96DPI is screen territory.
- At the same pixel count, a lower DPI prints bigger but looks softer. Pixels are the information; DPI only decides how they are spread.
- Resolution accepts 1–2400 and sizes 0.1mm–10,000mm.
- Print shops differ on required DPI and bleed. This tool handles the paper size itself only.
Frequently asked questions
How many pixels for an A4 print?
About 2480 × 3508 pixels at 300DPI (210 × 297mm); roughly half that, 1240 × 1754, at 150DPI. Choose the paper and DPI for the exact figure.
What DPI is my photo?
A photo file has pixels, not an inherent DPI. The DPI appears only when you decide how large to print it, which is why the same photo is high-DPI when printed small and low-DPI when printed large.
Why does a big print look soft?
The pixel count stays the same while the paper grows, so fewer dots fall within each inch. The only real fix is an original with more pixels — enlarging a small image adds no information.
What about bleed?
Printers usually want 2–3mm extra on each side. This tool calculates the paper size itself, so add whatever your printer specifies.