Pixel Pitch Calculator — instantly reveal how sharp your screen really is.
Enter your screen’s diagonal and resolution to find the exact pixel pitch (mm) and PPI in seconds.
Pixel Pitch Calculator – find the pixel spacing in millimeters for any display.
What is Pixel Pitch Calculator (and what it shows)
The Pixel Pitch Calculator measures the distance between each pixel on your screen, expressed in millimeters (mm), and also shows the corresponding PPI — pixels per inch. This helps you understand how tightly packed the pixels are and how sharp your display looks.
- Diagonal (in): your screen’s physical size, measured corner to corner.
- Width / Height (px): the screen’s resolution, or total pixel count across each axis.
- Results: the calculator returns both Pixel Pitch (mm) and PPI instantly.
Use it to compare screens or check how sharp your display really is.
How to Calculate Pixel Pitch (What the Math Does)
Calculating pixel pitch is simple — it tells you the physical spacing between pixels on a screen. The smaller the pitch, the sharper the display. Here’s the core math behind it:
PPI = √(Width² + Height²) ÷ Diagonal (in)
Relationship: PPI = 25.4 ÷ Pixel Pitch (mm)
Example: a 27″ monitor with 2560×1440 resolution gives a pixel pitch of about 0.233 mm — which equals roughly 109 PPI.
Smaller pitch = more pixels per inch = a crisper display.
Don’t Know Your Screen Specs?
If you’re in the United States or United Kingdom, your screen’s size and resolution are usually printed right on the box or product label.
Here’s what to look for:
Label | What It Means |
---|---|
27″ Monitor / 55″ TV | This is the screen size (diagonal in inches). |
3840×2160 (4K UHD) | This is your resolution (width × height in pixels). |
If these numbers aren’t printed on your device or box, don’t worry — you can easily find them in your system or by checking your device model online:
- Windows: Right-click Desktop → Display Settings → Resolution.
- Mac: Apple Menu → System Settings → Displays.
- Android: Settings → Display → Screen Resolution (or search “Display” in Settings).
- iPhone / iPad: Settings → Display & Brightness → View → choose “Standard” or “Zoomed” to see display info.
- Other countries or devices: search your model name on Google (e.x., “Samsung 32-inch monitor specs”) — you’ll instantly get diagonal size and resolution.
Still unsure? Try our Resolution to PPI Calculator — it finds your screen’s PPI instantly using only resolution and size.
Quick Presets (No Specs? Use These)
Not sure about your screen’s resolution or size? These quick presets show typical pixel pitch and PPI values for popular display types.
You can use them to estimate results instantly or compare screen sharpness before entering exact specs.
PPI: ≈ 92
PPI: ≈ 109
PPI: ≈ 163
PPI: ≈ 138
PPI: ≈ 80
PPI: ≈ 460
Values are typical/approximate — enter your exact screen specs for precise results.
4K Monitor Pixel Pitch (Explainer)
When it comes to 4K monitors, the pixel pitch changes dramatically depending on the screen size — even though the resolution (3840×2160) stays the same.
A smaller 4K screen packs pixels more tightly, resulting in a higher PPI and sharper detail, while a larger screen spreads those pixels further apart.
4K Screen Size | Approx. Pixel Pitch (mm) | Approx. PPI |
---|---|---|
27″ 4K | ~0.155 mm | ≈ 163 |
32″ 4K | ~0.181 mm | ≈ 138 |
42″ 4K | ~0.238 mm | ≈ 107 |
55″ 4K | ~0.462 mm | ≈ 80 |
Use the calculator above to compare pixel pitch vs screen size in seconds — and see how display sharpness really changes with 4K.
LED Pixel Pitch Calculator (Practical Planning)
In LED displays, pixel pitch refers to the distance between two adjacent pixels, measured in millimeters (mm).
Smaller pitch values mean higher pixel density and sharper visuals — ideal for closer viewing.
The table below shows typical PPI values and comfortable viewing distances for common LED pitches.
Pixel Pitch (mm) | Approx. PPI | Min Distance (m) | Comfort Distance (m) |
---|---|---|---|
1.5 mm | 16.9 | 1.5–2.2 | 3.0–4.5 |
1.9 mm | 13.4 | 1.9–2.9 | 3.8–5.7 |
2.5 mm | 10.2 | 2.5–3.8 | 5.0–7.5 |
3.9 mm | 6.5 | 3.9–5.8 | 7.8–11.7 |
6.0 mm | 4.2 | 6.0–9.0 | 12–18 |
Values are approximate and intended for general display planning.
Use our Pixel Density Calculator for precise screen analysis.
Pixel Pitch ↔ PPI Converter
The Pixel Pitch ↔ PPI converter helps you understand how display sharpness changes between different screen types.
It’s a simple inverse relationship:
Pixel Pitch (mm) = 25.4 ÷ PPI
Here are quick reference examples:
Pixel Pitch (mm) | Equivalent PPI | Display Type Example |
---|---|---|
0.155 mm | ≈ 163 PPI | 27″ 4K Monitor |
0.233 mm | ≈ 109 PPI | 27″ QHD Monitor |
0.277 mm | ≈ 92 PPI | 24″ 1080p Monitor |
0.462 mm | ≈ 80 PPI | 55″ 4K TV |
0.055 mm | ≈ 460 PPI | 6.1″ Smartphone |
Lower pitch = higher PPI (sharper image).
Use this as a quick reference to compare display sharpness across devices.
Common Resolutions Cheat Sheet (Monitor / TV)
Use this quick reference table to compare typical monitor and TV sizes across popular resolutions.
It lists each screen’s pixel pitch, PPI, and an approximate “retina-like” viewing distance —
the point where individual pixels are barely visible at normal desk or sofa distance.
Size | Resolution | Pixel Pitch (mm) | PPI | “Retina-ish” Distance |
---|---|---|---|---|
24″ Monitor | 1920×1080 (1080p) | ~0.277 mm | ≈ 92 | ~38 in (≈ 1 m) |
27″ Monitor | 2560×1440 (QHD) | ~0.233 mm | ≈ 109 | ~31 in (≈ 0.8 m) |
27″ Monitor | 3840×2160 (4K) | ~0.155 mm | ≈ 163 | ~21 in (≈ 0.5 m) |
32″ Monitor | 3840×2160 (4K) | ~0.181 mm | ≈ 138 | ~25 in (≈ 0.6 m) |
42″ Monitor / TV | 3840×2160 (4K) | ~0.238 mm | ≈ 107 | ~32 in (≈ 0.8 m) |
55″ TV | 3840×2160 (4K) | ~0.462 mm | ≈ 80 | ~43 in (≈ 1.1 m) |
These values are approximate and based on standard screen aspect ratios (16:9).
“Retina-ish” distances assume a typical human visual acuity of 1 arcminute (~3438 ÷ PPI).
Featured Answers — Quick Reference
How do you calculate pixel pitch?
Use pitch (mm) = 25.4 × diagonal (in) ÷ √(W²+H²); or simply pitch = 25.4 ÷ PPI.
How many PPI is 1920×1080?
Depends on screen size: 24″ ≈ 92 PPI, 27″ ≈ 82 PPI, 21.5″ ≈ 102 PPI.
Is 300 DPI the same as 300 pixels?
No. DPI/PPI means pixel density (pixels per inch), while “pixels” is a total count.
300 DPI ≠ 300 px.
How to calculate LED pixel pitch?
LED pitch is measured in millimeters (e.g., 1.9mm).
PPI ≈ 25.4 ÷ pitch; viewing distance increases with pitch size.
1.9mm resolution calculator pixel pitch
1.9mm is the pixel pitch itself; equivalent PPI ≈ 13.4 (25.4 ÷ 1.9).
Frequently Asked Questions
1. How do you calculate pixel pitch?
Pixel pitch (mm) = 25.4 × diagonal (in) ÷ √(width² + height²).
You can also use 25.4 ÷ PPI for a quick estimate.
2. How many PPI is 1920×1080 (for 24″ / 27″ / 21.5″)?
Approx values: 24″ ≈ 92 PPI, 27″ ≈ 82 PPI, 21.5″ ≈ 102 PPI.
3. Is 300 DPI the same as 300 pixels?
No. DPI (or PPI) means density—how many pixels fit in one inch.
300 DPI ≠ 300 px; the first is resolution per inch, the second is total count.
4. How to calculate LED pixel pitch?
For LED panels, pitch is given directly in millimeters (e.g., 1.9mm).
To estimate PPI: divide 25.4 by pitch. Viewing distance grows as pitch increases.
5. 1.9mm pixel pitch — what does it mean?
It means each pixel center is 1.9 millimeters apart.
That equals roughly 13.4 PPI, suitable for medium-distance LED displays.
6. 4K monitor pixel pitch vs 2K — which looks sharper and why?
4K monitors pack more pixels into the same diagonal, giving smaller pitch and higher PPI—hence visibly sharper details, especially at close distances.
Explore More Display Tools
📏 PPI Calculator
🔹 Resolution → PPI
📐 Pixels ↔ Inches (Print)
🖥️ Screen Size Calculator
🔸 Pixel Density Calculator
Use these when moving between pixels, print DPI, and physical display sizes.
For a deeper dive into display resolution and pixel pitch concepts, read the
Wikipedia article on Pixel Density.
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