pixel-to-inch conversion

Convert 1080 x 1350 Pixels to Inches at 72 and 300 PPI

Learn how to convert 1080×1350 pixels to inches at 72 PPI and 300 PPI, with formulas, aspect ratio tips, and clarity for web or print use.

Honghao Wang

— 3 min read
Convert 1080 x 1350 Pixels to Inches at 72 and 300 PPI

Converting 1080 × 1350 Pixels to Inches at 72 and 300 PPI

When handling images for social media, web design, or print, dimensions are usually expressed in pixels. However, for printing or precise sizing, you need to know the equivalent in inches based on PPI (pixels per inch). This guide explains exactly how to convert 1080 × 1350 pixels to inches for common resolutions like 72 PPI (web) and 300 PPI (print), and covers important factors such as aspect ratio and quality preservation.

Converting 1080 × 1350 Pixels to Inches at 72 and 300 PPI — convert 1080 x 1350 pixels to inches

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Pixels vs. Inches — Understanding the Difference

Pixels are tiny square units of color that compose a digital image. Inches measure physical size in the real world. The bridge between these two is PPI (Pixels Per Inch) or DPI (Dots Per Inch).

  • Pixels: Count of digital units (e.g., 1080 horizontally × 1350 vertically).
  • Inches: Physical measurement used in print or display specifications.
  • PPI/DPI: Indicates how many pixels fit into one inch; higher PPI means crisper, smaller pixels.

Key takeaway: The same pixel dimensions can yield very different print sizes depending on the PPI.

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Common PPI Settings — Web vs. Print

Digital and print workflows use different resolution standards:

Usage Common PPI Notes
Web / Screen 72 PPI Optimized for faster loading and on-screen clarity
Print / High-Quality 300 PPI Standard for professional, sharp printing

Images for Instagram feed posts will often use 72 PPI, while prints require 300 PPI or higher for best results.

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Formula for Conversion: Pixels to Inches

The formula to convert pixels into inches is simple:

Inches = Pixels ÷ PPI

Where:

  • Pixels: Image dimension in pixels.
  • PPI: Desired resolution (e.g., 72, 300).
  • Inches: Physical size output.

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Example: 1080 × 1350 at 72 PPI

Step-by-step calculation:

  1. Width in inches: `1080 ÷ 72 = 15` inches
  2. Height in inches: `1350 ÷ 72 = 18.75` inches

At 72 PPI:

  • Width: 15 inches
  • Height: 18.75 inches
Example: 1080 × 1350 at 72 PPI — convert 1080 x 1350 pixels to inches

Interpretation: Low PPI spreads pixels over more physical space, producing a larger yet less sharp image.

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Example: 1080 × 1350 at 300 PPI

High-resolution conversion:

  1. Width in inches: `1080 ÷ 300 = 3.6` inches
  2. Height in inches: `1350 ÷ 300 = 4.5` inches

At 300 PPI:

  • Width: 3.6 inches
  • Height: 4.5 inches

Interpretation: More pixels per inch create a smaller but much sharper print.

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Understanding Aspect Ratio

Aspect ratio is the proportional relationship between width and height.

For 1080 × 1350:

  • Aspect ratio: `1080 ÷ 1350 = 0.8` → 4:5 ratio

Why important:

  • Controls layout and orientation in digital platforms (portrait format).
  • Preserves framing in print; changing the ratio distorts or crops the image.

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Factors Affecting Pixel-to-Inch Conversion

  1. Screen resolution & pixel density — Modern displays have high pixel densities that make images appear smaller but more detailed.
  2. Printer capability — Standard home printers handle 300 PPI well; commercial printers can go beyond.
  3. Viewing distance — Large prints viewed from a distance may tolerate lower PPI.
  4. Image quality needs — For posters or magazines, 150–300 PPI is recommended to avoid visible pixels.
print-example

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Manual Math vs. Online Tools

Manual Method:

Width(inches) = width_pixels ÷ PPI
Height(inches) = height_pixels ÷ PPI

Online Tools:

  • Enter pixel dimensions and desired PPI.
  • Receive precise inch conversions instantly.
  • Many tools offer resize or crop options for further customization.

Tip: Manual calculation keeps you aware of scaling, avoiding potential errors in automated tools.

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Common Uses for 1080 × 1350 Pixel Resolution

This dimension is especially popular for Instagram portrait posts:

  • Fits perfectly in the feed without cropping.
  • Maximizes vertical space to grab attention.
  • Keeps file sizes optimal for quick uploads while maintaining clarity.

Other uses include:

  • Pinterest tall pins
  • Digital flyers and online ads
  • Blog content header images

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Resizing While Preserving Image Quality

Best practices:

  1. Start at maximum resolution — Capture or create at the highest pixel size possible.
  2. Use non-destructive edit workflows — Keep your original file intact.
  3. Maintain aspect ratio — Scale evenly to avoid distortion.
  4. Match PPI with usage — 72 PPI for web, 300 PPI for print.

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Summary Table — Conversion Results

PPI Width (inches) Height (inches) Aspect Ratio
72 15 18.75 4:5
300 3.6 4.5 4:5

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Conclusion

Knowing how to convert 1080 × 1350 pixels to inches is essential for preparing images for both screen and print. At 72 PPI, the image will be large but optimized for digital viewing; at 300 PPI, it becomes smaller yet extremely sharp for professional printing. By understanding pixels, inches, aspect ratios, and resolution, you can ensure your visuals look their best in every medium.

Ready to fine-tune your images? Apply these conversions in your next project to achieve precise sizing and flawless quality across platforms and prints.

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