Screen Size Calculator — enter your screen diagonal (inches) and pixel resolution (width×height) to get the real-world width & height in inches/cm plus pixel density (PPI). Ideal for TV, monitor, laptop, phone, and projector planning with accurate dimensions. Popular uses: monitor dimensions in cm, screen size comparison, TV & projector sizing.
How to use the Screen Size Calculator
Enter your screen diagonal (inches) and the pixel resolution (width × height). The calculator returns the
real-world width & height in inches and centimeters plus PPI (pixel density).
It works for TVs, monitors, laptops, phones, and projectors — perfect for sizing,
mounting, and room planning.
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- Type the Diagonal in inches (e.x., 27, 55, 6.5).
- Enter the Resolution as Width px and Height px (e.x., 2560 × 1440).
- Click Convert to get: Width & Height in in/cm and the PPI.
When to use it?
Common queries: what is my screen size, screen size in pixels, screen size calculator based on room size.
Steps & examples — from screen size in pixels to real dimensions
1
Enter Diagonal in inches (e.x., 27, 55).
2
Enter Resolution as Width px and Height px (e.x., 2560 × 1440, 3840 × 2160).
3
Click Convert to get Width & Height in in/cm and the PPI.
55″ • 3840×2160 (4K)
measure corner-to-corner (screen area only), then use the calculator to convert your screen size in pixels
into real monitor dimensions in cm and inches.
Screen size comparison — real dimensions & PPI (16:9)
Quick reference for popular sizes. Dimensions are physical (in/cm), and PPI depends on the resolution.
Great for screen size comparison and checking monitor dimensions in cm.
| Diagonal | Width | Height | PPI @1080p | PPI @1440p | PPI @4K |
|---|---|---|---|---|---|
| 24″ | 20.92 in (53.1 cm) | 11.77 in (29.9 cm) | 91.8 | 122.4 | 183.6 |
| 27″ | 23.53 in (59.8 cm) | 13.24 in (33.6 cm) | 81.6 | 108.8 | 163.2 |
| 32″ | 27.89 in (70.8 cm) | 15.69 in (39.8 cm) | 68.8 | 91.8 | 137.7 |
| 34″* | 29.63 in (75.3 cm) | 16.67 in (42.3 cm) | 64.8 | 86.4 | 129.6 |
| 43″ | 37.48 in (95.2 cm) | 21.08 in (53.5 cm) | 51.2 | 68.3 | 102.5 |
| 49″ | 42.71 in (108.5 cm) | 24.02 in (61.0 cm) | 45.0 | 59.9 | 89.9 |
| 50″ | 43.58 in (110.7 cm) | 24.51 in (62.3 cm) | 44.1 | 58.7 | 88.1 |
| 55″ | 47.94 in (121.8 cm) | 26.96 in (68.5 cm) | 40.1 | 53.4 | 80.1 |
| 65″ | 56.65 in (143.9 cm) | 31.87 in (80.9 cm) | 33.9 | 45.2 | 67.8 |
| 75″ | 65.37 in (166.0 cm) | 36.77 in (93.4 cm) | 29.4 | 39.2 | 58.7 |
* Table assumes 16:9 aspect ratio. Many 34″ monitors are ultrawide 21:9 (different width/height).
Use the calculator above to adjust for your exact diagonal and resolution.
TV & Home Theater — choose the right size by room distance
Use this guide as a tv screen size calculator reference when planning a living room or home theater.
The ranges below balance immersion and comfort (based on viewing angle). If your seating distance is fixed,
pick the TV that fits your space — a practical screen size calculator based on room size.
| TV size (16:9) | Suggested viewing distance (m) | Suggested viewing distance (ft) | Notes |
|---|---|---|---|
| 43″ | 1.7 – 2.2 m | 5.6 – 7.2 ft | Great for small rooms/apartments |
| 50″ | 1.9 – 2.5 m | 6.2 – 8.2 ft | Balanced size for typical living rooms |
| 55″ | 2.1 – 2.8 m | 6.9 – 9.2 ft | Popular sweet spot for 4K TVs |
| 65″ | 2.4 – 3.3 m | 7.9 – 10.8 ft | Cinematic feel in mid-large rooms |
| 75″ | 2.8 – 3.8 m | 9.2 – 12.5 ft | Great for bigger spaces and 4K content |
| 85″ | 3.2 – 4.3 m | 10.5 – 14.1 ft | Large rooms / dedicated media areas |
- Assumes 16:9 aspect ratio and centered seating. Shorter distances feel more immersive; longer distances feel more relaxed.
- With 4K, you can sit a bit closer without noticing pixels. For 1080p, stay near the upper end of the range.
- If your room is fixed, use the ranges like a tv screen size calculator to pick the diagonal that matches your screen size calculator based on room size needs.
Projector guide — image size, throw distance & screen gain
Use this as a practical screen size calculator projector reference. Choose your target image
(e.g., 100″ or 120″), then estimate throw distance from the lens throw ratio. It doubles as a handy
projector screen size calculator for home cinema setups.
| Target diagonal (16:9) | Image width | Image height |
|---|---|---|
| 100″ | 87.2 in (2.21 m) | 49.0 in (1.25 m) |
| 120″ | 104.6 in (2.66 m) | 58.8 in (1.50 m) |
distance = image width × throw ratio(typical ranges: short-throw 0.6–1.0, standard 1.3–1.9, long-throw 2.0–3.0)
| Lens type (throw ratio) | Distance range (meters) |
|---|---|
| Short-throw (0.6–1.0) | 1.33 – 2.21 m |
| Standard (1.3–1.9) | 2.88 – 4.21 m |
| Long-throw (2.0–3.0) | 4.43 – 6.64 m |
| Lens type (throw ratio) | Distance range (meters) |
|---|---|
| Short-throw (0.6–1.0) | 1.59 – 2.66 m |
| Standard (1.3–1.9) | 3.46 – 5.05 m |
| Long-throw (2.0–3.0) | 5.32 – 7.97 m |
- Room lighting & screen gain: In dark rooms, a matte white screen (~gain 1.0) gives uniform color.
With ambient light, consider ALR or higher gain (1.3–1.5) for brightness (trade-off: narrower viewing cone). - UST projectors: Require UST-ALR screens; placement is very close to the wall and geometry differs from standard projection.
- Seating distance (home cinema): Sit roughly 1.2–1.6× the diagonal. Example: 100″ (2.54 m) → sit ~ 3.0–4.1 m.
- For a cinema screen size calculator mindset: choose a diagonal that fills your field of view without strain; keep the lower third of the image near eye level.
- Mind offset/lens shift and avoid heavy digital keystone — optical alignment preserves sharpness.
Computer / Laptop / Phone — quick sizing & resolution guide
Use this section as a practical computer screen size calculator reference for everyday work,
gaming, and creative tasks. For portable devices, it also reads like a
screen size calculator laptop and a screen size calculator phone, helping you pick
a comfortable diagonal and screen size in pixels (resolution) that matches your use-case.
Desktop monitors
- Browsing & office: 24–27″ @ 1080p/1440p is comfortable. 27″ 1440p (~108 PPI) balances space and clarity.
- Gaming (mid-range): 27″ 1440p 144–240Hz is a sweet spot. For competitive eSports, 24–25″ 1080p 240Hz keeps motion sharp.
- Gaming (immersive): 32″ 1440p or 34″ ultrawide (3440×1440). For 4K gaming, 27–32″ if your GPU can drive it.
- Creative/design: 27–32″ 4K (≈ 163–140 PPI) for crisp UI and accurate detail; pair with good color coverage and calibration.
Laptops
- Portable & light: 13–14″ @ 1920×1200 or 2256×1504 — readable UI, good battery life.
- Mainstream work: 14–15.6″ @ 1920×1080 or 2560×1600 — more desktop space, ~150–180 PPI on hi-res panels.
- Creator / power user: 15–16″ @ 2560×1600 or 3840×2400 — sharper text and UI scaling flexibility.
- Gaming laptops: 15–16″ @ 2560×1440 165–240Hz, أو 1920×1080 240–360Hz للـ high-FPS.
Phones
- Modern 6.1–6.8″ phones commonly run ~1080×2400 or ~1440×3200. Focus on PPI (≈ 400–520) and PWM/refresh comfort.
- Higher PPI improves fine text and icons; larger diagonals help media and multitasking but affect reachability.
| Typical size | Common resolutions (screen size in pixels) | Use-case notes |
|---|---|---|
| 24″ monitor | 1920×1080 | Entry office / budget gaming (≈92 PPI) |
| 27″ monitor | 2560×1440 • 3840×2160 | 1440p sweet spot; 4K for design (≈109 / 163 PPI) |
| 32″ monitor | 2560×1440 • 3840×2160 | Bigger canvas; 4K crisp UI (≈92 / 138 PPI) |
| 14–16″ laptop | 1920×1200 • 2560×1600 • 3840×2400 | Balance clarity & scaling (≈150–280 PPI) |
| 6.1–6.8″ phone | 1080×2400 • 1440×3200 | High PPI for text; mind PWM & refresh |
Frequently Asked Questions (FAQ)
1) What is my screen size?
You can also look up your model’s specs. Then use the calculator: enter diagonal (inches) and screen size in pixels (width × height)
to get real Width/Height in cm & inches plus PPI.
2) Is DPI the same as PPI?
In casual use they’re often used interchangeably, but technically different. Changing DPI doesn’t change the
screen size in pixels; PPI depends on both pixel resolution and physical size.
3) Is 27-inch good for 1440p?
By comparison, 27″ 4K (~163 PPI) is crisper but usually needs UI scaling.
For physical monitor dimensions in cm, run the calculator with your diagonal and pixels.
4) Best TV size for a 3×4 m room?
Use the TV distance table above as a practical tv screen size calculator /
screen size calculator based on room size and adjust for your viewing habits.
5) Best resolution for a 32-inch monitor?
great for design and crisp text—but usually needs scaling. Pick based on distance, workload, and GPU performance.
Wrap-up — turn pixels into real-world sizes with confidence
With this Screen Size Calculator, you can translate screen size in pixels into
physical Width/Height (in/cm) and PPI in seconds—ideal for picking a TV size
for your room, comparing monitors, or planning projector setups. If you need related conversions, the tools below
cover megapixels, resolution mapping, and unit conversions for prints and displays.
Learn more: Pixel density (Wikipedia) •
Display resolution (Wikipedia).
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