Pixels to MM Converter — precise pixels to millimeters in one click.
At 96 PPI, 1 px = 0.2646 mm — pick 96/150/300 DPI for accurate web-to-print sizing.
MM to PX PX to MM
Pixels to Millimeters — what you need to know
Pixels have no fixed physical size — a pixel’s real-world length depends on resolution. To get millimeters, you must know the image or layout PPI/DPI. That’s exactly what this pixels to mm converter does: it turns any pixel to mm value once the correct PPI is set.
Note: the calculator above lets you choose the PPI (96 or 300) so your results match web or print output.
Formula & how it works
A pixel converts to millimeters through PPI: how many pixels exist in one inch. Use this pixel to mm calculator with your target resolution — common choices are 96 PPI for screens and Pixel to mm 300 DPI for print.
PX → MM: mm = (px / PPI) * 25.4 MM → PX: px = (mm * PPI) / 25.4
Choose the correct PPI for accurate size. Screens typically assume 96 PPI; print workflows often use 300 DPI. That’s the core of how to convert pixel to mm reliably.
Pick your PPI/DPI
Select the resolution used by your image or layout. The calculator supports 96, 150, 300 (print) and a custom value.
150 PPI
300 DPI
Custom
Tip: choose 96 PPI for screen sizing and 300 DPI for print-ready artwork. The calculator above lets you switch PPI before converting.
Quick examples (PX → MM)
Real-world sizes at common resolutions. Handy for 1920 pixels to mm, 1080 pixels in mm, and quick checks like 600 or 2000 pixels to mm.
@300 DPI → 162.56 mm
@300 DPI → 91.44 mm
Formula reminder: mm = (px / PPI) × 25.4
Conversion tables (PX → MM)
Exact pixel-to-millimeter values for common resolutions. Handy for quick checks like
1920 pixels to mm, 1080 pixels in mm, and 600/2000 pixels to mm.
300 DPI
| Pixels (px) | Millimeters (mm) |
|---|---|
| 0.5 | 0.042 |
| 1 | 0.085 |
| 2 | 0.169 |
| 4 | 0.339 |
| 8 | 0.677 |
| 16 | 1.355 |
| 32 | 2.709 |
| 64 | 5.419 |
| 256 | 21.675 |
| 512 | 43.349 |
| 600 | 50.800 |
| 1080 | 91.440 |
| 1920 | 162.560 |
| 2000 | 169.333 |
600 DPI
| Pixels (px) | Millimeters (mm) |
|---|---|
| 0.5 | 0.021 |
| 1 | 0.042 |
| 2 | 0.085 |
| 4 | 0.169 |
| 8 | 0.339 |
| 16 | 0.677 |
| 32 | 1.355 |
| 64 | 2.709 |
| 256 | 10.837 |
| 512 | 21.675 |
| 600 | 25.400 |
| 1080 | 45.720 |
| 1920 | 81.280 |
| 2000 | 84.667 |
96 PPI
| Pixels (px) | Millimeters (mm) |
|---|---|
| 0.5 | 0.132 |
| 1 | 0.265 |
| 2 | 0.529 |
| 4 | 1.058 |
| 8 | 2.117 |
| 16 | 4.233 |
| 32 | 8.467 |
| 64 | 16.933 |
| 256 | 67.733 |
| 512 | 135.467 |
| 600 | 158.750 |
| 1080 | 285.750 |
| 1920 | 508.000 |
| 2000 | 529.167 |
MM → PX (quick)
| Millimeters (mm) | Pixels @300 DPI | Pixels @600 DPI |
|---|---|---|
| 10 | 118.11 | 236.22 |
| 50 | 590.55 | 1181.10 |
| 100 | 1181.10 | 2362.20 |
Formula reminder: mm = (px / PPI) × 25.4 •
px = (mm × PPI) / 25.4
Practical use-cases
Web / CSS teams
Map CSS sizes in px to print specs in mm before exporting assets. Use the factor shown in the tool:
mm = (px / PPI) × 25.4.
Choose 96 PPI for screen previews or 300 DPI for print artwork, then export at the target PPI so the physical size matches.
Photoshop / Illustrator / InDesign
Ensure artwork meets the required physical size in millimeters. For Pixels to mm Photoshop checks:
- Photoshop: Image → Image Size → uncheck Resample → set Resolution (PPI) → switch units to mm to read the document size.
- Illustrator: File → Document Setup → Units = Millimeters. Use Artboard tool to confirm size in mm.
- InDesign: new document → Units = mm; place images at the correct scaling so final layout matches the required mm.
ImageJ / Microscopy
Convert pixel distances to millimeters after you define the scale. How to convert pixels to mm in ImageJ:
- Analyze → Set Scale → enter a known pixel length and its real-world distance in mm.
- Set Unit = mm and check Global to apply across images (optional).
- Measure features: results are now reported directly in millimeters.
How to use the converter
Convert pixels to millimeters in a few quick steps. Pick the correct PPI/DPI so the physical size matches your screen or print output.
- Enter your value in pixels (px).
- Choose PPI/DPI — 96, 150, 300, or custom.
- Get the result in millimeters (mm).
- Need the reverse? Use our
MM → PX converter.
FAQs — Pixels to Millimeters (PX → MM)
How to convert pixel to mm?
Use: mm = px * 25.4 / PPI. Set the correct PPI/DPI first for accurate physical size.
What is 1 pixel in mm?
At 96 PPI: 1 px = 0.2646 mm. At 300 DPI: 1 px = 0.0847 mm.
What size is 1920×1080 pixels in inches?
At 96 PPI: 20 x 11.25 in. At 300 DPI: 6.4 x 3.6 in.
How do you calculate pixels per mm?
Use: px_per_mm = PPI / 25.4. Example: 96 PPI → 3.7795 px/mm; 300 DPI → 11.811 px/mm.
Pixels to mm Photoshop (no-resample method)
Image → Image Size → uncheck Resample → set Resolution (PPI) → switch units to mm to read document size.
How to convert pixels to mm in ImageJ
Analyze → Set Scale → enter a known pixel length and its distance in mm → set Unit = mm → (optional) check Global → measurements now report mm.
Px to cm?
Formula: cm = px * 2.54 / PPI. Try our
PX to CM converter.
Is PPI the same as DPI?
In practice people use them interchangeably. PPI refers to pixels per inch (screens/images); DPI refers to printer dots per inch. The math here uses the same number either way.
Which PPI should I use?
For screen previews, use 96 PPI. For print, 300 DPI is common (some packaging/photography use 150–600). Always confirm with your printer or brand guidelines.
Related tools
Already using our pixels to mm converter? Jump to these calculators for common web-to-print workflows.
Conclusion
Converting pixels (px) to millimeters (mm) is all about choosing the correct resolution.
Once you set the PPI/DPI, the math is straightforward:
mm = (px / PPI) × 25.4.
Use 96 PPI for screen previews or 300 DPI for print; the calculator supports both (and custom values) so your exported assets match the intended physical size.
For background on image resolution and PPI/DPI, see
Wikipedia.