Microsoft Paint helper
Pixels to MM in Paint
Enter the pixel width and height shown in Paint, then use the image's resolution or a target print DPI to calculate its physical dimensions in millimeters.
Live conversion
Enter dimensions
Converted size
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mm = pixels × 25.4 ÷ DPI Enter valid dimensions to see the calculation.
Calculations stay in your browser. No dimensions are uploaded.
Three-step workflow
How to use this calculator
Open image properties
Find the bitmap's width and height in pixels, or use the dimensions shown by Windows file properties.
Confirm the resolution
Use the stored horizontal resolution when it is meaningful, or enter the intended print DPI.
Calculate millimeters
Read the physical width and height and use them in your page or print setup.
Practical guide
Understand what Paint's pixel dimensions mean
Paint works primarily with bitmap pixels. Width and height tell you how many pixels the image contains, while DPI or PPI metadata supplies the intended physical scale. Changing one value does not automatically create more real detail.
For print planning, use the target printer density even if Paint or Windows reports 96 DPI. The same bitmap can be assigned a different physical size without changing its pixel count, but enlarging it reduces effective resolution.
Official reference: Microsoft image property reference ↗Common questions
Microsoft Paint FAQ
Why does Paint often show 96 DPI?
96 DPI is a common Windows screen reference and may be used when an image lacks meaningful physical-size metadata.
Does resizing in Paint change print size?
Changing pixel dimensions changes the possible print size at a fixed DPI. Changing only scale metadata changes the intended size without adding detail.
Where can I find an image's pixel dimensions?
Check Paint's image properties or the Dimensions field in Windows file properties.
Can I use 300 DPI for a Paint image?
Yes for planning: enter 300 DPI to see how large the existing pixels can print at that density.
Specialized tools
More pixel-to-mm tools
Continue with a calculator tailored to another design, print, or office workflow.