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Pixels to Inches Calculator

Convert pixels to inches, inches to pixels, and calculate screen PPI from resolution. Covers web (96 PPI), print (300 DPI), and any custom resolution. Free and instant.

Author: Naeem Ullah
•Last Updated: July 1, 2026•
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Active Calculation FormulaInches = Pixels ÷ PPI

Adjust Variables

px
px_val
Min: 1 pxMax: 8k
ppi
ppi_val
Min: 1 ppiMax: 600 ppi
Use Real Campaign Presets
Real-Time Results
Inches0
Centimetres0
Millimetres0
All calculations are compiled with double-precision floating math directly in this browser frame. Perfect precision guaranteed.

Interactive Step-by-Step Calculation Proofs

View how variables resolve algebraically down to peer-reviewed standard outputs.

Why Use This Calculator

Pixels (px) are the fundamental unit of digital screens, but inches are the universal unit for print, physical dimensions, and device specifications. Converting between the two requires knowing the PPI (Pixels Per Inch) — also called DPI (Dots Per Inch) in print contexts — which defines how many pixels fit in one inch. The standard screen PPI is 96 PPI for Windows and most web browsers (the W3C CSS standard), 72 PPI for legacy Mac/web contexts, and 72–326+ PPI for modern mobile displays. For print, the minimum is 150 DPI for draft quality and 300 DPI for professional output. Our pixel to inches calculator converts in both directions — enter pixel dimensions with a known PPI to get the physical size in inches, centimetres, and millimetres; or enter a physical size in inches to get the exact pixel count needed for print. The PPI calculator mode lets you compute the pixel density of any screen from its resolution and diagonal size — useful for comparing monitor sharpness and determining whether to use HiDPI asset variants. Pair this tool with the proportion calculator when scaling designs to new dimensions proportionally.

Mathematical Formula Explanation

Calculated standard benchmarks are based on direct functional dependencies. The primary calculation logic follows this formula:

Inches = Pixels ÷ PPI

Pixels → Inches and Inches → Pixels are the same relationship (Inches = Pixels ÷ PPI) run in opposite directions once a PPI value is known or assumed. Calculate Screen PPI solves for that missing PPI value itself, using the Pythagorean relationship between a screen's diagonal pixel count and its physical diagonal size — this is the mode to use first if PPI isn't already known, since the other two modes both require it as an input.

Worked Examples (Step-by-Step)

These examples show a web banner's physical size at the standard 96 PPI, and a monitor's actual pixel density calculated from its resolution and diagonal size.

Case Scenario 1

Example 1: 1920 px Web Banner at 96 PPI

“A web designer needs to know the physical width of a 1920-pixel wide banner at the standard 96 PPI web resolution. What is the size in inches, cm, and mm?”

Given Inputs
  • PX_VAL: 1,920
  • PPI_VAL: 96
Computed Outputs
  • INCHES_OUT: 20
  • CM_OUT: 50.8
  • MM_OUT: 508
Case Scenario 2

Example 2: 27-inch QHD Monitor PPI

“A UX designer wants the PPI of a 27-inch 2560 × 1440 QHD monitor to decide if HiDPI asset exports are needed.”

Given Inputs
  • SCREEN_W: 2,560
  • SCREEN_H: 1,440
  • DIAG_IN: 27
Computed Outputs
  • PPI_OUT: 109
  • PHYS_W: 23.53
  • PHYS_H: 13.24

Frequently Asked Questions (FAQ)

There is no single fixed answer — it depends on the PPI (Pixels Per Inch) of the device or output: 96 PPI is the CSS/Windows web standard (96 px = 1 in); 72 PPI is the legacy Mac/web standard; 300 PPI/DPI is the professional print standard; 600 DPI is used for high-fidelity print. On a modern 96 PPI screen, there are 96 pixels per inch. On a 300 DPI print output, there are 300 pixels per inch. Always match the PPI to your target medium.

Use: Inches = Pixels ÷ PPI. Steps: (1) Identify the PPI of your target medium — 96 for web/Windows, 300 for print. (2) Divide your pixel count by the PPI. Example: 288 px ÷ 96 PPI = 3 inches. For centimetres multiply by 2.54; for millimetres multiply by 25.4. At 300 DPI, 900 px ÷ 300 = 3 inches.

Use: Pixels = Inches × PPI. For web: a 2-inch element at 96 PPI = 2 × 96 = 192 px. For print: a 3.5-inch image at 300 DPI = 3.5 × 300 = 1,050 px. For an A4 print at 300 DPI (8.27 × 11.69 in): width = 8.27 × 300 = 2,481 px, height = 11.69 × 300 = 3,507 px.

PPI (Pixels Per Inch) describes screen pixel density — how many pixels exist per physical inch of a display. DPI (Dots Per Inch) is a print measurement — how many ink dots a printer deposits per inch. In everyday usage these terms are interchangeable for digital-to-print conversions. The formula Inches = Value ÷ PPI/DPI works identically for both.

The W3C CSS standard is 96 PPI — adopted by Windows and modern browsers. This means 96 CSS pixels = exactly 1 inch at default zoom. Legacy Mac and early web tools used 72 PPI. Note that high-DPI (Retina/HiDPI) displays have much higher physical PPI (220–400+), but browsers abstract this with device pixel ratio (DPR), so 1 CSS pixel may map to 2 or 3 physical pixels. For design work targeting web, always use 96 PPI.

Use: PPI = √(Width² + Height²) ÷ Diagonal (all in pixels / inches respectively). Example: 1920 × 1080 screen at 24 inches diagonal — diagonal_px = √(1920² + 1080²) = √4,852,800 ≈ 2,203 px. PPI = 2,203 ÷ 24 ≈ 92 PPI. Use the 'Calculate Screen PPI' mode above to do this automatically.

At 300 DPI, 1 inch = 300 pixels. Common reference points: 72 PPI → 72 px/in; 96 PPI → 96 px/in; 150 DPI → 150 px/in; 300 DPI → 300 px/in; 600 DPI → 600 px/in. A full A4 page at 300 DPI requires 2,481 × 3,507 pixels.

It depends on PPI: at 96 PPI (web standard) 1,080 ÷ 96 = 11.25 inches; at 72 PPI → 15 inches; at 300 DPI → 3.6 inches; at 192 PPI (Retina) → 5.625 inches. On a physical 1080p monitor, the answer varies by screen size — a 1920 × 1080 display at 24 inches has ≈ 92 PPI, so 1,080 px ≈ 11.7 physical inches on that screen.

Pixels needed = Inches × 300. Common print sizes at 300 DPI: A4 (8.27 × 11.69 in) → 2,481 × 3,507 px. US Letter (8.5 × 11 in) → 2,550 × 3,300 px. 4×6 photo → 1,200 × 1,800 px. 5×7 photo → 1,500 × 2,100 px. 8×10 photo → 2,400 × 3,000 px. If your printer needs 150 DPI (draft), halve these values.

Retina displays pack more physical pixels per inch (220–460+ PPI on Apple devices) but present a logical resolution at half or third the physical count. A MacBook Pro at 220 PPI uses a 2× DPR, meaning 1 CSS point = 2 physical pixels. For web assets: export at 2× (192 effective PPI) for Retina, 3× for iPhone. For print: physical PPI is irrelevant — only the DPI of the exported image matters. The CSS pixel (96 PPI reference) remains the correct unit for all web layout calculations regardless of device PPI.

Sources & Methodology

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