Convert pixels to millimeters at any DPI
Enter a value in pixels, set the DPI resolution, and read the result in millimeters. Check how large a camera file, a web image, or a Figma export would physically be once printed. The converter helps you pick the right dimension before sending a file to a print shop.
Why convert pixels to millimeters?
A pixel is a digital unit that describes a single point on a screen or in an image file. The millimeter, on the other hand, describes physical size — print shops specify business card, flyer, and bleed dimensions in millimeters. To convert one to the other, you need to know the DPI resolution: the number of pixels packed into one inch of material or screen.
This conversion is used most often by designers checking how large their project will physically be once printed, photographers judging whether a camera file is large enough for a specific format, and anyone working in Figma or Photoshop, who works in pixels but has to deliver a file with an exact physical dimension. The converter saves you from doing the math by hand and remembering the formula.
Further down this page you will find an extensive reference table for popular pixel values, a table running from the resolution of a finished file to the format on paper, and short guides on reading a file's real resolution in InDesign, Illustrator, Photoshop, PDF, Figma, CorelDRAW, Canva, Inkscape, Affinity, and EXIF data.
How does px to mm conversion work? Formula and example
The whole conversion comes down to one formula, based on the fixed relationship between an inch and a millimeter: one inch is exactly 25.4 mm. So you just multiply the number of pixels by 25.4 and divide by your chosen DPI resolution.
The full formula is: millimeters = pixels × 25.4 ÷ DPI. The converter performs this calculation instantly, so you never have to do the math or hunt for a calculator.
Example: say you want to know how many millimeters 1,063 pixels are at a print resolution of 300 DPI. Plugging the values into the formula gives 1,063 × 25.4 ÷ 300, which is exactly 90 mm — exactly the width of a standard business card. The same 1,063 pixels displayed on a 96 DPI screen would take up 281 mm, because fewer points fit per inch. Screens always count by the 96 pixels per inch written into the CSS standard, which is why the same file measures differently there than in print.[1]
Starting a design from scratch with a size in millimeters? That direction belongs to the millimeters to pixels converter.
When the file is bound for an American print shop, the same measurement is quoted in inches: 2,550 pixels at 300 DPI is 8.5 inches, the width of a Letter sheet. The pixels to inches converter handles that.
Print shops and typesetting software state the size of the type itself in typographic points. One point is 0.3528 mm, so a 12-point type size occupies 4.23 mm. The pixels to points converter moves a mock-up measurement into that unit.
How many millimeters do different pixel values produce at different DPI?
The table below shows how the same pixel values translate to millimeters at the five most commonly used resolutions. A few values match real formats exactly: 413 px at 300 DPI is the short edge of a passport photo, and 1,063 px is the width of a standard business card.
| Pixels | 72 DPI | 96 DPI | 150 DPI | 300 DPI | 600 DPI |
|---|---|---|---|---|---|
| 50 px | 17.64 mm | 13.23 mm | 8.47 mm | 4.23 mm | 2.12 mm |
| 90 px | 31.75 mm | 23.81 mm | 15.24 mm | 7.62 mm | 3.81 mm |
| 100 px | 35.28 mm | 26.46 mm | 16.93 mm | 8.47 mm | 4.23 mm |
| 150 px | 52.92 mm | 39.69 mm | 25.40 mm | 12.70 mm | 6.35 mm |
| 200 px | 70.56 mm | 52.92 mm | 33.87 mm | 16.93 mm | 8.47 mm |
| 250 px | 88.19 mm | 66.15 mm | 42.33 mm | 21.17 mm | 10.58 mm |
| 300 px | 105.83 mm | 79.38 mm | 50.80 mm | 25.40 mm | 12.70 mm |
| 400 px | 141.11 mm | 105.83 mm | 67.73 mm | 33.87 mm | 16.93 mm |
| 413 px | 145.70 mm | 109.27 mm | 69.93 mm | 34.97 mm | 17.48 mm |
| 500 px | 176.39 mm | 132.29 mm | 84.67 mm | 42.33 mm | 21.17 mm |
| 591 px | 208.49 mm | 156.37 mm | 100.08 mm | 50.04 mm | 25.02 mm |
| 600 px | 211.67 mm | 158.75 mm | 101.60 mm | 50.80 mm | 25.40 mm |
| 640 px | 225.78 mm | 169.33 mm | 108.37 mm | 54.19 mm | 27.09 mm |
| 720 px | 254.00 mm | 190.50 mm | 121.92 mm | 60.96 mm | 30.48 mm |
| 800 px | 282.22 mm | 211.67 mm | 135.47 mm | 67.73 mm | 33.87 mm |
| 827 px | 291.75 mm | 218.81 mm | 140.04 mm | 70.02 mm | 35.01 mm |
| 900 px | 317.50 mm | 238.13 mm | 152.40 mm | 76.20 mm | 38.10 mm |
| 1,000 px | 352.78 mm | 264.58 mm | 169.33 mm | 84.67 mm | 42.33 mm |
| 1,063 px | 375.00 mm | 281.25 mm | 180.00 mm | 90.00 mm | 45.00 mm |
| 1,080 px | 381.00 mm | 285.75 mm | 182.88 mm | 91.44 mm | 45.72 mm |
| 1,181 px | 416.63 mm | 312.47 mm | 199.98 mm | 99.99 mm | 50.00 mm |
| 1,200 px | 423.33 mm | 317.50 mm | 203.20 mm | 101.60 mm | 50.80 mm |
| 1,500 px | 529.17 mm | 396.88 mm | 254.00 mm | 127.00 mm | 63.50 mm |
| 1,920 px | 677.33 mm | 508.00 mm | 325.12 mm | 162.56 mm | 81.28 mm |
| 2,000 px | 705.56 mm | 529.17 mm | 338.67 mm | 169.33 mm | 84.67 mm |
| 2,048 px | 722.49 mm | 541.87 mm | 346.79 mm | 173.40 mm | 86.70 mm |
| 2,400 px | 846.67 mm | 635.00 mm | 406.40 mm | 203.20 mm | 101.60 mm |
| 2,480 px | 874.89 mm | 656.17 mm | 419.95 mm | 209.97 mm | 104.99 mm |
| 3,000 px | 1,058.33 mm | 793.75 mm | 508.00 mm | 254.00 mm | 127.00 mm |
| 3,508 px | 1,237.54 mm | 928.16 mm | 594.02 mm | 297.01 mm | 148.51 mm |
| 4,000 px | 1,411.11 mm | 1,058.33 mm | 677.33 mm | 338.67 mm | 169.33 mm |
| 5,000 px | 1,763.89 mm | 1,322.92 mm | 846.67 mm | 423.33 mm | 211.67 mm |
| 6,000 px | 2,116.67 mm | 1,587.50 mm | 1,016.00 mm | 508.00 mm | 254.00 mm |
| 8,000 px | 2,822.22 mm | 2,116.67 mm | 1,354.67 mm | 677.33 mm | 338.67 mm |
All values are rounded to two decimal places, following the formula mm = px × 25.4 ÷ DPI.
The most popular print formats and their pixel dimensions
If instead of a single pixel value you need the dimensions of a finished format (for example a business card, a DL flyer, or an A4 sheet), the table below lists the values at the two most commonly used resolutions. Dimensions are always given as width × height.
| Format | W × H (mm) | W × H (150 DPI) | W × H (300 DPI) |
|---|---|---|---|
| Business cards & ID | |||
| Polish business card | 90 × 50 mm | 531 × 295 px | 1,063 × 591 px |
| European business card | 85 × 55 mm | 502 × 325 px | 1,004 × 650 px |
| Payment / SIM card (ISO ID-1) | 85.60 × 53.98 mm | 506 × 319 px | 1,011 × 638 px |
| Flyers & print | |||
| DL flyer | 99 × 210 mm | 585 × 1,240 px | 1,169 × 2,480 px |
| Postcard / A6 | 105 × 148 mm | 620 × 874 px | 1,240 × 1,748 px |
| ISO A-series paper | |||
| A5 | 148 × 210 mm | 874 × 1,240 px | 1,748 × 2,480 px |
| A4 | 210 × 297 mm | 1,240 × 1,754 px | 2,480 × 3,508 px |
| A3 | 297 × 420 mm | 1,754 × 2,480 px | 3,508 × 4,961 px |
| A2 | 420 × 594 mm | 2,480 × 3,508 px | 4,961 × 7,016 px |
| A1 | 594 × 841 mm | 3,508 × 4,967 px | 7,016 × 9,933 px |
| A0 | 841 × 1,189 mm | 4,967 × 7,022 px | 9,933 × 14,043 px |
| Documents & large format | |||
| EU passport / ID photo | 35 × 45 mm | 207 × 266 px | 413 × 531 px |
| B1 poster | 707 × 1,000 mm | 4,175 × 5,906 px | 8,350 × 11,811 px |
| Roll-up banner | 850 × 2,000 mm | 5,020 × 11,811 px | 10,039 × 23,622 px |
These values mirror the table in our mm to px converter — you can always work from either direction, as long as you know the pixel count and the target DPI.
Comparison of pixel and millimeter units
| Property | Pixel (px) | Millimeter (mm) |
|---|---|---|
| Unit type | Digital, screen-based | Physical, tangible |
| Depends on device | Depends on DPI or PPI | Always the same |
| Screen 96 DPI | 1 px = 0.265 mm | 1 mm = 3.78 px |
| Print 300 DPI | 1 px = 0.085 mm | 1 mm = 11.81 px |
| Industry standard | Screens, web design, UI | Print, packaging, CAD |
How do you check a file's real resolution in millimeters?
InDesign and effective PPI
Open Window › Links and expand the image you care about. InDesign shows two figures: Actual PPI is the resolution of the source file, while Effective PPI is the resolution after scaling on the page. Only the second one counts. A 300 PPI photo scaled to 50% has an effective 600 PPI and is fine, but blown up to 200% it drops to 150 PPI and the print shop will reject it.Illustrator
Document dimensions live in File › Document Setup, and a single object's in the Transform panel. You change the unit in Edit › Preferences › Units. Embedded raster images carry their own resolution independent of the document, which you check in the Links panel.Photoshop
Open Image › Image Size and switch the unit to millimeters. Clear Resample, and changing the Resolution field then recalculates the physical size without touching the pixels. That shows how many millimeters your file gives at the 300 DPI print asks for.PDF and preflight
In Acrobat the page size sits in File › Properties › Description, under Page Size. The Preflight tool additionally checks the resolution of embedded images and flags those below a threshold. Print shops usually set that threshold at 300 DPI for photographs and 1,200 DPI for line art.Figma
Figma works purely in pixels at a fixed 96 DPI. To get the size in millimeters, divide the frame width by 96 and multiply by 25.4. When exporting for print set the scale to 3.125×, which is the ratio of 300 to 96.CorelDRAW
Click an empty spot on the page and the property bar shows the page size, with the Units list right next to the width and height fields. The resolution of an embedded bitmap sits in Window › Dockers › Object Manager once the image is selected — CorelDRAW reports it in the Resolution field alongside the size in millimeters.Canva
In the Resize panel switch the unit to millimeters and Canva shows the current project size without changing it. Canva works in pixels internally, so at download time pick PDF Print — that export runs at 300 DPI, the resolution at which the millimeter figure matches what the panel showed you.Inkscape and Affinity
Inkscape reports the page size under File › Document Properties (Shift + Ctrl + D), with separate settings for the size unit and the display unit shown on the rulers. Affinity has been a single app since version 3 and keeps the same information in File › Document Setup together with the DPI field, in every studio. Both apps store the physical size inside the file, so the same artwork opened later reports the same millimeters.Camera files and EXIF data
Cameras write a resolution of usually 72 DPI into EXIF whatever the quality of the shot. Print size is decided by the pixel count alone: a 24 Mpx sensor gives 6,000 × 4,000 px, which is 508 × 338.67 mm at 300 DPI. Larger formats read more easily in centimeters, which is what the pixels to centimeters converter gives you.
What format do typical file resolutions produce?
You are handed a file with a given pixel count and want to know what it is good for. This table runs that way: from the resolution of the file to the size on paper at two print thresholds. The 300 DPI column covers offset and digital print viewed close up, the 150 DPI column covers posters and material seen from a metre away.
| File resolution | Size at 300 DPI | Size at 150 DPI | Closest format |
|---|---|---|---|
| 413 × 531 px | 35 × 45 mm | 70 × 90 mm | ID photo |
| 1,004 × 650 px | 85 × 55 mm | 170 × 110 mm | European business card |
| 1,050 × 600 px | 89 × 51 mm | 178 × 102 mm | US business card |
| 1,169 × 2,480 px | 99 × 210 mm | 198 × 420 mm | DL flyer |
| 1,748 × 2,480 px | 148 × 210 mm | 296 × 420 mm | A5 sheet |
| 2,480 × 3,508 px | 210 × 297 mm | 420 × 594 mm | A4 sheet |
| 3,508 × 4,961 px | 297 × 420 mm | 594 × 840 mm | A3 sheet |
| 1,920 × 1,080 px | 163 × 91 mm | 325 × 183 mm | Full HD screenshot |
| 4,000 × 3,000 px | 339 × 254 mm | 677 × 508 mm | 12 Mpx phone photo |
| 6,000 × 4,000 px | 508 × 339 mm | 1,016 × 677 mm | 24 Mpx camera photo |
Sizes are rounded to whole millimeters following the formula mm = px × 25.4 ÷ DPI. The format column names the closest print standard, so before sending anything to a print shop check the side ratio and the bleed as well. A result longer than a thousand millimeters is written in meters: 6,000 pixels at 150 DPI is 1,016 mm, or 1.016 m, which the pixels to meters converter reports.
When do you need a file measured in millimeters?
Checking camera photos for print
You know your camera sensor produces files at 6,000 × 4,000 px. The converter shows that at 300 DPI, that is exactly 508 × 338.67 mm — comfortably enough for an A2 poster. You can also check the lower limit: how large a smaller file from a phone or a web image would print.Exporting from Figma or Photoshop for print
You designed a flyer in Figma as a 1,169 × 2,480 px artboard and want to know whether that matches a standard DL format. The converter shows that at 300 DPI, that is exactly 99 × 210 mm, one third of an A4 sheet — the size DL envelopes of 110 × 220 mm are built around.Checking files before sending them to a print shop
You received a file with a width of 2,480 px from a client and do not know what format that is. The converter immediately shows that at 300 DPI, that is exactly 210 mm — the width of an A4 sheet. That helps you avoid a print shop rejecting the file for the wrong resolution.ID photos and business cards
Your camera produced a 413 × 531 px photo and you are wondering whether it is the right format. The converter shows that at 300 DPI, that is exactly 35 × 45 mm — the EU standard for biometric passport and ID photos. The same approach works for business cards: a 1,063 × 591 px file is our standard 90 × 50 mm business card at 300 DPI.
Convert other units to Millimeters
Convert Pixels to other units
Explore other unit converters
Sources
- CSS Values and Units Module Level 3 — W3C
- ISO/IEC 7810 — Wikipedia
Every figure in the tables was computed from the unit definitions and checked arithmetically before publication. Historical values and the names of local units come from the sources listed above.
Content last reviewed: · written and checked by the Arteon team
Frequently asked questions about px to mm conversion
How many millimeters is 1 pixel?
It depends entirely on the resolution you set. At the standard 96 DPI screen resolution, one pixel is about 0.265 mm, and at the 300 DPI used for print, only 0.085 mm. To convert any number of pixels to millimeters, multiply it by 25.4 and divide by the DPI.
What is the formula for converting px to mm?
The formula comes from a fixed relationship: one inch is exactly 25.4 mm. The full formula is millimeters = pixels × 25.4 ÷ DPI. It also works in reverse: pixels = millimeters × DPI ÷ 25.4. You only need two values — the pixel count and the target resolution — to instantly calculate the third.
How do I convert pixels to millimeters?
The simplest way is to type the pixel count into the converter field and pick the DPI you need — the result appears instantly. If you would rather calculate it by hand, use the formula: millimeters = pixels × 25.4 ÷ DPI. For 500 px at 300 DPI, you get 500 × 25.4 ÷ 300, or about 42.33 mm.
How many millimeters is 100 pixels?
One hundred pixels on a 96 DPI screen is exactly 26.46 mm. At 300 DPI print resolution, the same 100 pixels only takes up 8.47 mm, and at 600 DPI just 4.23 mm. This value is worth remembering, since it often appears in button and icon sizes on websites.
How many millimeters is 500 pixels?
Five hundred pixels is about 132.29 mm on a 96 DPI screen and 42.33 mm at 300 DPI print resolution. 500 px is a popular width for ad banners and avatars, so it is a useful value to remember when estimating sizes quickly.
How many millimeters is 1,000 pixels?
One thousand pixels at 96 DPI is about 264.58 mm. At 300 DPI print resolution, the same 1,000 pixels is 84.67 mm — enough for a large label or a small photo. At the 150 DPI used for posters and brochures, it comes out to 169.33 mm, roughly postcard-sized.
What are the dimensions in millimeters of a file that is 2,480 pixels wide?
A file that is 2,480 pixels wide at 300 DPI is exactly 210 mm — the width of an A4 sheet. A print shop will accept the file without issue if the height is 3,508 px (297 mm). The same file on a 96 DPI screen would take up 656.17 mm, stretching well beyond the visible area of a typical monitor.
How many millimeters is a 6,000-pixel photo from a camera?
Six thousand pixels is a typical width for a photo from a mid-range DSLR or mirrorless camera. At 300 DPI used for photo printing, that comes out to 508 mm — comfortably enough for an A2-sized poster or a wide gallery print. If the photo has a 3:2 ratio, the other edge is 4,000 px, or 338.67 mm.
What is bleed and how many millimeters does it correspond to in pixels?
Subtract twice the bleed from the file dimension and you get the trimmed format. A file 1,133 px wide at 300 DPI is 95.9 mm, so taking off two 3 mm bleeds leaves 89.9 mm, a 90 mm business card. If the subtraction lands on a size that matches no standard format, the file most likely arrived without bleed.
How do I set px to mm in Figma?
Figma works exclusively in pixels at a fixed 96 DPI — there is no option to switch the unit to millimeters. To check a Figma project's physical dimensions, copy the pixel count from the Design panel and type it into our converter, setting your target DPI (96 for screen, 300 for print).
What is the exact size of a payment card in millimeters?
The ISO ID-1 standard, which applies to payment cards, ID cards, and driving licences, is exactly 85.60 × 53.98 mm.[2] A 1,011 × 638 px file at 300 DPI matches that exact size. A file of 1,011 × 638 px at 300 DPI hits that standard to a tenth of a millimeter.
How many millimeters is a pixel on a Retina screen?
Apple Retina screens pack pixels twice as densely as a classic monitor, but the operating system still interprets dimensions as if the panel had 96 DPI. In practice this means one physical pixel takes up about 0.132 mm instead of 0.265 mm, yet in the design panels of Photoshop, Figma or Canva the values stay identical — you prepare the artwork at double resolution and export it with the @2x suffix.
Is 1 pixel the same as 1 millimeter?
No, that is a common misconception. A pixel and a millimeter are two different units — one digital, one physical — and the relationship between them changes with the DPI resolution. At the standard 96 DPI screen, one pixel is about 0.265 mm, while at 300 DPI print resolution it is only 0.085 mm. There is no single fixed value that applies universally.
What pixel dimensions does a business card have, and how many millimeters is that?
A Polish business card at 1,063 × 591 px is exactly 90 × 50 mm at 300 DPI. A European business card at 1,004 × 650 px is 85 × 55 mm at the same resolution. After adding the standard 3 mm bleed on every edge, the dimensions grow to 96 × 56 mm, or about 1,134 × 661 px.
How do I set pixels to millimeters in Illustrator or InDesign?
In Adobe Illustrator, go to Edit › Preferences › Units and choose Millimeters — the unit changes across all panels and rulers immediately. InDesign uses millimeters by default. In both programs, the result depends on the resolution set when exporting the file, usually 300 DPI for print. You will find detailed guides for Illustrator, InDesign, CorelDRAW, Photoshop, Figma, and Canva in the section above.
What is the difference between DPI and PPI?
DPI (dots per inch) is the number of ink dots per inch of material and is a printer specification. PPI (pixels per inch) is the number of pixels per inch of screen and describes a monitor or display. In everyday use, designers use both terms interchangeably, but technically DPI applies to print and PPI to screens.
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