20 inches is equal to 1920 pixels (px).
This conversion assumes a standard screen resolution of 96 pixels per inch (PPI). By multiplying the number of inches by the pixel density, the physical length in inches can be translated to the corresponding number of pixels, which is useful in digital design and screen measurement.
Conversion Tool
Result in px:
Conversion Formula
The formula to convert inches to pixels is:
pixels = inches × pixels per inch (PPI).
Since the standard PPI for most computer screens is 96, multiplying the inch value by 96 yields the pixel equivalent. This works because pixels are the smallest unit on a display, and PPI signifies how many pixels fit in one inch on screen.
For example, for 20 inches:
20 inches × 96 PPI = 1920 pixels.
Conversion Example
- 15 inches to pixels:
- Start with 15 inches.
- Multiply by 96 (15 × 96).
- Result is 1440 pixels.
- 5.5 inches to pixels:
- Begin with 5.5 inches.
- 5.5 × 96 = 528 pixels.
- This means 5.5 inches equals 528 pixels.
- 30 inches to pixels:
- Take 30 inches.
- Multiply by 96 → 30 × 96.
- Result is 2880 pixels.
- 2.25 inches to pixels:
- Start with 2.25 inches.
- 2.25 × 96 = 216 pixels.
- So, 2.25 inches equals 216 pixels on screen.
Conversion Chart
| Inches | Pixels (px) |
|---|---|
| -5.0 | -480 |
| -2.5 | -240 |
| 0.0 | 0 |
| 2.5 | 240 |
| 5.0 | 480 |
| 7.5 | 720 |
| 10.0 | 960 |
| 12.5 | 1200 |
| 15.0 | 1440 |
| 17.5 | 1680 |
| 20.0 | 1920 |
| 22.5 | 2160 |
| 25.0 | 2400 |
| 27.5 | 2640 |
| 30.0 | 2880 |
| 32.5 | 3120 |
| 35.0 | 3360 |
| 37.5 | 3600 |
| 40.0 | 3840 |
| 42.5 | 4080 |
| 45.0 | 4320 |
Use this chart to quickly find the pixel equivalent for inch values between -5 and 45. Just find the inch value in the left column, then read across to see pixels. Negative inches show pixel values in negative direction, useful in some coordinate systems.
Related Conversion Questions
- How many pixels are in 20 inches on a 96 PPI screen?
- What pixel size corresponds to 20 inches for web design?
- Is 20 inches always equal to 1920 pixels on every display?
- How to convert 20 inches to px for a high resolution monitor?
- What’s the pixel count of a 20-inch width image at standard screen resolution?
- Does 20 inches differ in pixels on retina displays?
- How to calculate px from 20 inches using CSS?
Conversion Definitions
Inches: A unit of length in the imperial system, equal to 1/12 of a foot or 2.54 centimeters. Inches are commonly used in the United States for measuring height, length, and width of objects. It’s often the standard measurement in print and hardware industries where precise sizing is needed.
Pixels (px): The smallest controllable element of a digital image or display. Pixels form the grid of a screen, defining resolution and size of digital graphics. One pixel represents one point of color in a bitmap image. Pixels don’t have fixed physical size but depend on screen density or resolution.
Conversion FAQs
Why do screens use 96 pixels per inch for conversion?
96 PPI is a convention used in many operating systems and browsers to represent a “standard” pixel density. This standard simplifies design and layout calculations by establishing a consistent scale. However, physical screen densities vary, so 96 PPI is more of a baseline than a fixed value.
Can the conversion from inches to pixels change on different devices?
Yes, because pixel density (PPI) varies between devices like monitors, smartphones, and tablets. A 20-inch measurement on a low-resolution screen will have fewer pixels than the same size on a high-resolution display. So, conversions depend on the PPI specific to the device.
Is it accurate to use 96 PPI for print media calculations?
No, print media usually requires higher resolutions (300 DPI or more) for quality output. The 96 PPI is tailored for screen display and not suitable for print, where pixel density and physical dimensions differ greatly, making print conversion need different formulas.
What happens if I use fractional inches in the conversion?
Using fractional inches works fine by multiplying the decimal value by 96. The result is a fractional pixel count, which can be rounded or truncated depending on the application. This allows for precise sizing in digital layouts when exact measurements are needed.
How does CSS handle inch to pixel conversion?
CSS uses a reference pixel which is roughly equal to 1/96th of an inch. When you specify lengths in inches, browsers convert them to pixels based on this standard. However, due to device pixel ratios and zoom levels, the actual rendered size may slightly differ from the calculated pixel value.