PX/PT Conversion

Tool Introduction

The PX/PT conversion tool is an online unit converter designed specifically for designers and developers. It can quickly convert pixel (PX) values to point (PT) values and supports custom Pixels Per Inch (PPI), ensuring that the conversion results accurately match your design and development needs. Whether it's for screen display adaptation, Web font size adjustment, or print output layout, this tool provides convenient and efficient solutions to help you easily handle various unit conversion challenges.

How to Use

Using this tool for PX to PT conversion is very simple and intuitive:

1. Enter the PX value you want to convert in the "Pixels" input box. This value should be a positive number and supports decimals. The default value is 1.
2. Set your desired Pixels Per Inch (PPI) in the "PPI" input box. The default value is 96, which is a common DPI for Web design, but you can modify it according to the actual device or design standard. This parameter is required and should be a positive integer.
3. The tool will automatically calculate and display the converted PT (point) value in real-time based on your entered PX value and set PPI value.
4. The converted PT value can be directly copied and used.

Usage Examples

Below is a practical example of the PX/PT conversion tool to help you understand its working principle and results:

• Scenario 1: Convert 100 pixels to points in standard Web design
  • Input: Pixels (PX) = 100, PPI = 96 (Web standard DPI)
  • Operation: Enter 100 in the "Pixels" box and 96 in the "PPI" box.
  • Expected Output: PT = 75pt
  • Calculation Process: 100px × (72pt / 96px) = 75pt
• Scenario 2: Convert 144 pixels to points in high-resolution print design
  • Input: Pixels (PX) = 144, PPI = 144 (High-resolution printing device)
  • Operation: Enter 144 in the "Pixels" box and 144 in the "PPI" box.
  • Expected Output: PT = 72pt
  • Calculation Process: 144px × (72pt / 144px) = 72pt

PX and PT Calculation Principle

PX to PT conversion is based on physical dimension conversion. The core formula is:

PT = PX × (72 / PPI)

• PX: The pixel value to be converted.
• PT: The converted point value.
• PPI: Pixels Per Inch.
• Constant 72: Represents 72 points per inch (1 inch = 72pt), which is the internationally accepted definition of a print point.

The principle of this formula is: first, calculate the physical size in inches corresponding to one pixel at the current PPI (i.e., 1 / PPI inches), then multiply this inch value by the number of points per inch (72) to get the point value corresponding to one pixel. Finally, multiply the total number of pixels by this single-pixel point value to get the total number of points.

Frequently Asked Questions

• Q: What are Pixels (PX) and Points (PT)?

  A: Pixels (PX) are the smallest units of a digital image, typically used for screen display and digital media. Points (PT) are a unit of length commonly used in the printing industry, where 1 point (PostScript point) equals 1/72 inch. Both PX and PT are units of measurement, but their physical size may vary depending on the device or resolution.

• Q: What is PPI (Pixels Per Inch)? Why is it important in PX/PT conversion?

  A: PPI represents the number of pixels per inch, which determines how many pixels are in a specific physical size. In PX to PT conversion, PPI is the key bridge. Because 1 inch is always equal to 72pt, and the number of pixels contained in 1 inch is determined by PPI, PPI can be used to associate pixels (digital units) with points (physical units) to achieve accurate conversion and ensure the correspondence of physical dimensions.

• Q: Does this tool support PT to PX conversion?

  A: This tool is primarily designed to convert pixels (PX) to points (PT). If you need to perform the inverse conversion from PT to PX, you can use the inverse calculation logic of this tool: PX = PT × (PPI / 72).

• Q: Does the conversion result support decimals?

  A: Yes, to provide more precise values, the conversion result will retain decimals.

Notes

• Please ensure that the entered "Pixels" and "PPI" values are valid positive numbers. Invalid input may lead to calculation errors or no results.
• The "PPI" value is a key parameter affecting the conversion result. Please set it accurately according to your actual use scenario (e.g., Web display, print output, mobile device adaptation, etc.). Different PPI values will result in the same PX value converting to different PT values.
• This tool converts PX to PT based on equivalent physical dimensions, mainly applied in design layout, printing, or cross-device display adaptation scenarios to ensure visual consistency between different units.