PX/CM Conversion

Tool Introduction

"PX/CM Conversion" is a convenient online tool designed to help users quickly convert pixels (PX) to centimeters (CM). Whether you are a designer, developer, or a user who needs to process image print sizes, this tool can provide accurate conversion results. It automatically calculates the corresponding centimeter size by inputting the pixel value and the crucial Pixels Per Inch (PPI) parameter, solving your troubles with conversions between different units.

How to Use

1. In the "Pixels" input box, enter the pixel value you need to convert (e.g., 1920).
2. In the "PPI" input box, enter or adjust the Pixels Per Inch value. This parameter is crucial for accurate conversion; for example, screens commonly use 96 or 72, while printing usually requires a higher 300. The default value is 96.
3. The tool will automatically calculate and display the corresponding "Centimeters" value based on your input pixel value and PPI value.
4. You can use the copy button next to it to easily copy the converted centimeter value.

Usage Example

Suppose you have an image with a width of 100 pixels (px), and you know its PPI on the target device is 96. You want to know its corresponding width in centimeters?

• Example Input Data:
  • Pixels (PX): 100
  • PPI: 96
• Specific Operation Demonstration:
  1. Enter 100 in the "Pixels" input box.
  2. Enter 96 in the "PPI" input box (or keep the default value).
  3. The tool will automatically calculate and display the result.
• Expected Output Result:
  • Centimeters (CM): 2.65

  (Calculation process: 100 px × (2.54 cm / 96 px) ≈ 2.6458 cm, the tool usually rounds to two decimal places and displays as 2.65 cm)

PX and CM Conversion Formula

The conversion between pixels (PX) and centimeters (CM) requires a key parameter: Pixels Per Inch (PPI). The conversion formula is as follows:

• 1 inch = 2.54 centimeters (cm)
• 1 inch = PPI pixels (px)

Therefore, we can conclude:

1 pixel (px) = (2.54 / PPI) centimeters (cm)

Or:

Centimeters (CM) = Pixels (PX) × (2.54 / PPI)

Through this formula, you can understand how the tool performs precise conversions.

What is PPI?

PPI is an abbreviation for Pixels Per Inch. It is a unit for measuring image resolution, indicating how many pixels are contained in each inch of length.

• For screen display: PPI determines the clarity of the screen. The higher the PPI value, the more pixels the screen can display at the same size, and the finer the image.
• For image printing: PPI determines the quality of the print output. Printing usually requires a higher PPI (e.g., 300 PPI) to obtain clear, jagged-free prints. If the PPI is too low, the printed image may appear blurry or grainy.

In pixel to physical size conversion, PPI is an indispensable bridge that defines the mapping relationship from pixels to inches, thereby achieving accurate conversion from pixels to centimeters.

Frequently Asked Questions

• Q: What input formats are supported? A: This tool supports entering pixel values (PX) and PPI values in pure numeric form. Both input boxes can only accept positive integers or decimals.
• Q: What is the format of the output result? A: The output result is the converted centimeter (CM) value, usually accurate to two or more decimal places, and displays the unit "cm".
• Q: Why is the PPI parameter so important? A: PPI (Pixels Per Inch) is the key bridge for converting between pixels and physical length (such as centimeters). Different screens or printing requirements have different PPI values. Without PPI, pixel values cannot be directly mapped to actual physical dimensions. For example, an image of 100 pixels will have completely different physical dimensions on a 96 PPI screen and a 300 PPI printer.
• Q: Does this tool support converting centimeters (CM) to pixels (PX)? A: Based on the current interface configuration, this tool primarily supports converting pixels (PX) to centimeters (CM). If you need reverse conversion, you may need to look for other specialized tools or wait for future version updates.

Notes

• Input Data Requirements: Both the "Pixels" and "PPI" fields require valid numbers. Do not enter non-numeric characters, as this may lead to conversion failure or inaccurate results.
• Accuracy of PPI: The accuracy of the conversion result highly depends on the PPI value you provide. Please ensure that the entered PPI value meets your actual needs (e.g., screen PPI or print PPI). Incorrect PPI will lead to inaccurate physical dimensions.
• Precision: Conversion results may have slight errors due to floating-point calculations. The tool usually performs appropriate rounding to improve readability.