CM to Pixel Converter — Instant, Bidirectional, Print-Ready
Convert centimetres to pixels and pixels to centimetres at any DPI. Type in either field and the other updates in real time — with a live proportional preview, quick presets for print and screen, and a smart assistant that explains every number.
01 · Direction
CM → PX02 · Values
—03 · Result
04 · History
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10 cm at 300 DPIConversion Assistant
explains DPI, print, and web
PX → CM: cm = px × 2.54 ÷ DPI
constant: 2.54 cm = 1 inch
CM to Pixel Converter: Convert Centimeters to Pixels and Back
Turn centimeters into pixels, or pixels into centimeters, at any DPI. Everything runs in your browser — no uploads, no sign-up, no limits.
Use the CM to Pixel Converter above to turn centimeters into pixels, or pixels into centimeters, at any DPI. The formula is px = cm ÷ 2.54 × DPI
At 96 DPI, 1 cm is 37.8 px. At 300 DPI, it is 118.11 px.
How to use the CM to Pixel Converter
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1
Choose your direction
Type centimeters to get pixels, or type pixels to get centimeters.
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2
Pick a DPI
Choose 72, 96, 150, 300 or 600, or enter a custom value. Use 96 for screens and 300 for print.
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3
Read the result
The result updates as you type, or tap a quick button for 1, 2, 5 or 10 cm.
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4
Review your history
The last 10 conversions are listed, and you can download them as a TXT file for your records.
CM to PX formula
Centimeters become pixels in two steps: convert to inches by dividing by 2.54, then multiply by DPI.
01 Worked examples
Every CM to Pixel Converter uses this same arithmetic, so a difference between tools almost always comes from the DPI each one assumes.
PX to CM formula
To go the other way, multiply by 2.54 and divide by DPI.
01 Worked examples
Whether you call it pixels to cm or px to centimeters, the rule is the same. The same image can be about 29 cm wide on screen and 9 cm wide in print. The pixels never changed. Only the DPI did.
How many pixels are in a cm?
The number of pixels in a cm depends entirely on DPI. If you have ever searched for centimeters in pixels and received five different answers, this is why:
| DPI | Pixels in 1 cm | Typical use |
|---|---|---|
| 72 | 28.35 | Point-based work (Word, PDF) |
| 96 | 37.80 | Web and CSS |
| 150 | 59.06 | Draft prints, large posters |
| 300 | 118.11 | Standard print quality |
| 600 | 236.22 | Fine line art, small detailed prints |
DPI to px: why the answer changes
DPI means dots per inch. A pixel has no fixed physical size, so how many centimeters it covers depends on how tightly pixels are packed. Going from 300 DPI to pixels is simple: every inch holds 300 pixels, so 1 cm holds 118.11. At 96 DPI the same centimeter holds only 37.8.
Strictly speaking, DPI describes printer dots and PPI describes pixels per inch on a screen or in an image. In practice most tools use the terms interchangeably, and the math is identical.
- 96 DPI is the CSS reference: 96 px equals one inch.
- 72 DPI matches points. One point is 1/72 inch, about 0.0353 cm, which is useful if you need to convert pt to cm.
- 150 DPI suits large posters viewed from a distance.
- 300 DPI is the standard for photos, flyers and ID photos.
- 600 DPI is for fine line art and small detailed prints, and it makes files much larger.
This CM to Pixel Converter asks for a DPI because there is no honest answer without one. Choose the DPI of wherever the image will end up.
CM to pixels reference table
You don't need to open the CM to Pixel Converter for common values. Here are the most requested, in pixels:
| cm | 72 DPI | 96 DPI | 150 DPI | 300 DPI | 600 DPI |
|---|---|---|---|---|---|
| 1 | 28.35 | 37.80 | 59.06 | 118.11 | 236.22 |
| 2 | 56.69 | 75.59 | 118.11 | 236.22 | 472.44 |
| 3.5 | 99.21 | 132.28 | 206.69 | 413.39 | 826.77 |
| 4.5 | 127.56 | 170.08 | 265.75 | 531.50 | 1062.99 |
| 5 | 141.73 | 188.98 | 295.28 | 590.55 | 1181.10 |
| 10 | 283.46 | 377.95 | 590.55 | 1181.10 | 2362.20 |
| 15 | 425.20 | 566.93 | 885.83 | 1771.65 | 3543.31 |
| 20 | 566.93 | 755.91 | 1181.10 | 2362.20 | 4724.41 |
Common sizes in cm and pixels
These sizes were calculated with the CM to Pixel Converter at 96 and 300 DPI:
| Item | Size (cm) | At 96 DPI | At 300 DPI |
|---|---|---|---|
| Passport-style photo | 3.5 × 4.5 | 132 × 170 | 413 × 531 |
| Small ID photo | 2.5 × 3.5 | 94 × 132 | 295 × 413 |
| Small banner | 5 × 2 | 189 × 76 | 591 × 236 |
| Photo print | 10 × 15 | 378 × 567 | 1181 × 1772 |
| Wide banner | 20 × 10 | 756 × 378 | 2362 × 1181 |
| A4 page | 21 × 29.7 | 794 × 1123 | 2480 × 3508 |
Passport and visa requirements differ by country and change over time. Check the issuing authority's current rules before submitting.
Pixel size reference table (in centimeters)
Here is the reverse: what common pixel lengths measure in centimeters. It's the same formula, run backwards by the CM to Pixel Converter:
| Pixels | 72 DPI | 96 DPI | 150 DPI | 300 DPI | 600 DPI |
|---|---|---|---|---|---|
| 10 | 0.353 | 0.265 | 0.169 | 0.085 | 0.042 |
| 100 | 3.53 | 2.65 | 1.69 | 0.85 | 0.42 |
| 500 | 17.64 | 13.23 | 8.47 | 4.23 | 2.12 |
| 1000 | 35.28 | 26.46 | 16.93 | 8.47 | 4.23 |
| 1920 | 67.73 | 50.80 | 32.51 | 16.26 | 8.13 |
All values in cm.
Popular image sizes in centimeters
Some sizes start in pixels, so here are three run through the CM to Pixel Converter backwards:
| Image size | At 96 DPI | At 300 DPI |
|---|---|---|
| 1080 × 1350 px (4:5 portrait) | 28.58 × 35.72 cm | 9.14 × 11.43 cm |
| 1024 × 1536 px (2:3 portrait) | 27.09 × 40.64 cm | 8.67 × 13.00 cm |
| 1920 × 1080 px (Full HD) | 50.80 × 28.58 cm | 16.26 × 9.14 cm |
Step one of the formula: cm to inches
Because the formula begins by dividing by 2.54, it helps to know common lengths in inches. For example, 9.5 cm to inches is 3.74 in. The CM to Pixel Converter does this step for you, but here are common values:
| cm | Inches |
|---|---|
| 2.1 | 0.83 |
| 3.5 | 1.38 |
| 4.5 | 1.77 |
| 8.5 | 3.35 |
| 9.5 | 3.74 |
| 10.8 | 4.25 |
| 12.8 | 5.04 |
| 13.8 | 5.43 |
| 15.8 | 6.22 |
| 34.5 | 13.58 |
For any other value, divide by 2.54. To go from inches to cm, multiply by 2.54: 4.5 in is 11.43 cm, and 8 × 8 in is 20.32 × 20.32 cm. Also remember that 1 cm is 10 mm.
Large prints: why DPI matters
Run 150 × 100 cm through the CM to Pixel Converter at two settings and the gap is huge. At 300 DPI you need 17,717 × 11,811 px, about 209 million pixels. At 100 DPI you need 5,906 × 3,937 px, about 23 million. Large-format printers often accept lower DPI because people view big prints from farther away, so ask your print shop what they need before you build the file.
Common mistakes when using a CM to Pixel Converter
Trusting the result without checking DPI
A CM to Pixel Converter is only as right as the DPI you give it.
Mixing up cm and mm
10 mm is 1 cm, so a unit slip makes the answer ten times off.
Rounding too early
Convert first, then round once at the end.
Confusing pixels with print size
Changing a file's DPI tag doesn't change its pixels; resizing does.
Enlarging a small image
If you need 2480 px but only have 800, the print will look soft.
From numbers to a real image
A CM to Pixel Converter gives you the target pixel dimensions. To apply them to a photo, use our Resize Image in CM tool, which resizes to the exact width and height you enter.
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Frequently asked questions
How many pixels is 1 cm?
How do I convert centimeters into pixels?
How do I convert pixels into centimeters?
How big is 4.5 cm?
What size is a passport photo in pixels?
What is 1024x1536?
Is the CM to Pixel Converter accurate?
Why does another CM to Pixel Converter give a different answer?
What DPI should I use?
Key takeaways
- A CM to Pixel Converter needs both a length and a DPI, because pixels have no fixed physical size.
- The formulas: px = cm ÷ 2.54 × DPI and cm = px × 2.54 ÷ DPI.
- Use 96 DPI for screens and 300 DPI for print.
Try the CM to Pixel Converter with your own numbers
Scroll up and enter any centimeter or pixel value. Choose a DPI, read the result instantly, and download your history — free, private, and no signup required.
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