Pixels to cm or inches at any DPI, the pixels a print needs, and the DPI a photo gives
Processed in your browser. Nothing is uploaded. Updated on 25 Oct 2026.A photo's print size is its pixels divided by the DPI, in inches, and one inch is 2.54 cm. At 300 DPI, 413 by 531 pixels print as a 35 by 45 mm passport photo and 1,200 by 1,800 pixels as a 4 by 6 inch print. Enter any two of pixels, size and DPI.
Under Work out, choose Print size from pixels, Pixels for a print, or DPI at a print size.
Fill in the two figures you know: the width and height in pixels, the print width and height, or the DPI.
Pick cm, mm or inches for the print size, or tap a Print size such as Passport 35×45 mm or 4×6 in.
Read the answer as it updates, and press Share result to copy a link with these numbers.
Pixels, print size and DPI are tied by one rule: pixels = inches × DPI. This page takes any two and gives the third, in centimetres, millimetres and inches, as you type.
Print size from pixels. Enter the width and height in pixels and the DPI. A 4,000 by 3,000 pixel phone photo at 300 DPI prints 33.87 by 25.4 cm, which is 13.33 by 10 inches.
Pixels for a print. Enter the print size, or tap a preset: passport 35 × 45 mm, 2 × 2 inch, 4 × 6 inch or A4. At 300 DPI these need 413 × 531, 600 × 600, 1,200 × 1,800 and 2,480 × 3,508 pixels. Pixels are rounded to the nearest whole pixel, the same way Resize Image rounds its presets.
DPI at a print size. Enter the pixels and the size you want to print. The DPI across and down are both shown; when the photo and the print are different shapes, the lower one is what the print gets, and the page says the print will be cropped or bordered.
How much DPI is enough. 300 DPI is the usual target for photo prints and ID photos held in the hand, and it is the default here. 200 to 299 still looks good in most prints, 150 to 199 suits posters seen from a metre or more, and below 150 the pixels may show up close. These are guidelines, not rules: when a form or a print shop names a DPI, use theirs.
What it does not do. No photo is opened or changed here. To make a photo a given pixel size, use Resize Image; to check what a form asks for, read its notice. The DPI stored inside a JPG file does not change how many pixels it has, so this page works from the pixels alone.
Divide the pixels by the DPI to get inches, then multiply by 2.54. At 300 DPI, 600 pixels are 2 inches, which is 5.08 cm. Enter the width and height in pixels and the DPI, and both sides appear in centimetres, millimetres and inches.
At 300 DPI a 35 by 45 mm photo is 413 by 531 pixels: 35 mm is 1.378 inches, and 1.378 times 300 is 413. Tap the passport preset in Pixels for a print to see it, or change the DPI if a form asks for another figure.
A 4 by 6 inch print at 300 DPI needs 1,200 by 1,800 pixels, about 2.2 megapixels. At 200 DPI, 800 by 1,200 pixels is enough for a print that still looks good in the hand. Almost any phone photo has more than either.
Around 300 DPI is the usual target for photos and ID prints held at reading distance. Prints between 200 and 299 DPI look good in most cases, 150 to 199 suits posters seen from further away, and under 150 the pixels may show when looked at closely.
No. The DPI number stored in a JPG only suggests a print size; the pixels stay the same. Sharpness in print depends on how many pixels cover each inch, which is why this calculator works from the pixels and the print size alone.
No. The calculator only works out numbers and never opens a picture. Once you know the pixels you need, Resize Image makes the photo that size, with presets for passport, 2 by 2 inch and A4, all inside your browser.
Still stuck? Ask about Photo Size Calculator and anybody who knows can answer. No account needed.
Same job, other tools: Compress Image to 50 KB – Shrink a photo under 50 KB without losing the face · Passport Size Photo – Convert a photo to Indian passport size: 35×45 mm at 300 DPI, exactly 413×531 pixels · Visa Photo 2x2 Inch – Crop or resize a photo to 2x2 inch: a square 600×600 pixels at 300 DPI for a US visa · Compress Image to 100 KB – Get any photo under 100 KB for forms and portals · Image Converter – Convert between JPG, PNG, WebP, AVIF, BMP, TIFF and ICO, from ten input formats.
On the related tools: HEIC to PNG – Convert iPhone HEIC photos to lossless PNG.