リアルタイム変換。ピクセルまたはcmを入力し、PPIを選択してください。送信ボタンなしで即座に動作します。
Enter pixels or centimeters to convert instantly
通常ピクセルは整数ですが、微細な計算のために小数点も受け付けます。
サイズを入力すると、ピクセル値がすぐに更新されます。
変換には画素密度（PPI）が必要です。1インチ = 2.54 cmです。使用される計算式:
cm = pixels ÷ PPI × 2.54 pixels = cm ÷ 2.54 × PPI 例：96 PPIの場合、100 px ≈ 2.65 cm。300 PPIの場合、100 px ≈ 0.85 cm。
PPIはデジタル画像の解像度、DPIはプリンターのドット密度です。物理サイズの計算にはPPIを使用します。
ウェブ画像なら1000 pxで十分なことが多いです。印刷には、目標PPIに応じたより大きな解像度が必要です。
| ピクセル | センチメートル (cm) |
|---|---|
| 0.01px | — cm |
| 0.1px | — cm |
| 1px | — cm |
| 2px | — cm |
| 3px | — cm |
| 5px | — cm |
| 10px | — cm |
| 20px | — cm |
| 50px | — cm |
| 100px | — cm |
| 1000px | — cm |
1920×1080 at 96 PPI
50.8 cm × 28.58 cm
1000 px at 96 PPI
26.46 cm
A pixel (px) is the smallest addressable element of a raster image displayed on a screen. The word "pixel" is a combination of "picture" and "element." Each pixel represents a single point of color, and millions of pixels together form the images you see on monitors, phones, and tablets.
Pixels have no fixed physical size — their real-world dimensions depend on the display's pixel density (PPI). A pixel on a 27-inch 1080p monitor is physically larger than a pixel on a 6-inch smartphone with the same resolution.
Key fact: A standard web display uses 96 PPI, meaning each pixel is approximately 0.0265 cm (0.265 mm) wide.
A centimeter (cm) is a metric unit of length equal to one hundredth of a meter. It is widely used around the world for everyday measurements — from paper sizes (A4 is 21 × 29.7 cm) to screen dimensions and print layouts.
Unlike pixels, centimeters represent a fixed physical size. When designers and print professionals need to specify how large an image will appear on paper or in the physical world, they use centimeters (or inches). Converting between pixels and centimeters requires knowing the resolution (PPI) of the output device.
Key fact: 1 inch = 2.54 cm. This constant is the bridge between pixels (digital) and centimeters (physical).
DPI (Dots Per Inch) measures how many ink dots a printer places within one linear inch. Higher DPI means finer detail and smoother prints. Common print DPI values include 150 (draft), 300 (standard quality), and 600+ (high-quality or photo prints).
While DPI is often used interchangeably with PPI, they are technically different. PPI (Pixels Per Inch) refers to digital screen resolution, while DPI refers to printer output. For pixel-to-cm conversion, PPI is the correct value to use.
PPI (Screens)
72, 96, 150, 200, 300 PPI
DPI (Printers)
150, 300, 600, 1200 DPI
The conversion between pixels and centimeters uses a straightforward mathematical formula based on the pixel density (PPI):
cm = (pixels / PPI) × 2.54 pixels = (cm / 2.54) × PPI Step-by-step example: Convert 500 pixels to cm at 96 PPI:
A pixels to cm conversion table provides quick, pre-calculated results so you don't need to do the math yourself. Each row shows a pixel value and its equivalent in centimeters at a specific PPI. Below is a multi-PPI comparison table for the most commonly used pixel values:
| Pixels | 72 PPI | 96 PPI | 150 PPI | 300 PPI |
|---|---|---|---|---|
| 50 px | 1.76 cm | 1.32 cm | 0.85 cm | 0.42 cm |
| 100 px | 3.53 cm | 2.65 cm | 1.69 cm | 0.85 cm |
| 200 px | 7.06 cm | 5.29 cm | 3.39 cm | 1.69 cm |
| 500 px | 17.64 cm | 13.23 cm | 8.47 cm | 4.23 cm |
| 1000 px | 35.28 cm | 26.46 cm | 16.93 cm | 8.47 cm |
| 1920 px | 67.73 cm | 50.80 cm | 32.51 cm | 16.26 cm |
| 3840 px | 135.47 cm | 101.60 cm | 65.02 cm | 32.51 cm |
How to read this table: Find your pixel value in the left column, then look across to the PPI column that matches your display or print setting. The intersection gives you the physical size in centimeters.
Common screen resolutions and their physical dimensions at 96 PPI (standard web display):
| Resolution (px) | Width (cm) | Height (cm) |
|---|---|---|
| 1200 × 1600 | 31.75 | 42.33 |
| 1024 × 1536 | 27.09 | 40.64 |
| 1080 × 1350 | 28.58 | 35.72 |
| 3024 × 4032 | 80.01 | 106.68 |
| 1920 × 1080 | 50.80 | 28.58 |
| 3464 × 3464 | 91.65 | 91.65 |
| 1600 × 400 | 42.33 | 10.58 |
| 431 × 531 | 11.40 | 14.05 |
| 2550 × 3300 | 67.47 | 87.31 |
| 3840 × 2160 | 101.60 | 57.15 |
Note: These dimensions change with PPI. At 300 PPI (print), the same 1920×1080 image would only be 16.26 × 9.14 cm.
The pixel-to-centimeter ratio varies depending on the PPI setting. Here's a quick reference for the most common PPI values:
The higher the PPI, the more pixels fit into each centimeter — resulting in sharper, more detailed images.
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