Screen Size & PPI Calculator - TV, Monitor, Phone & Projector

Calculate screen dimensions, PPI, viewing distance, and throw distance for TV, monitor, laptop, phone, tablet & projector.

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Monitor Size Calculator

Calculate dimensions, resolution & PPI

Screen Size

Aspect Ratio

Resolution

Width

23.53in

Height

13.24in

PPI

109

Area

312in²

Pixels

3.7MP

Pitch

0.23mm

Screen Visualization

Credit Card (3.4" x 2.1")

Screen = 6.8x card

Popular Screen Size Comparisons

Compare screen sizes visually. See how different devices stack up against each other.

phone 6.9" vs 6.9"

Popular Device Screen Sizes

Quick access to the most searched device specifications and dimensions.

phone 6.9"

iPhone 17 Pro Max

2868 x 1320

phone 6.3"

iPhone 17 Pro

2622 x 1206

phone 6.8"

Samsung Galaxy S25 Ultra

3120 x 1440

phone 6.2"

Samsung Galaxy S25

2340 x 1080

phone 6.9"

iPhone 16 Pro Max

2868 x 1320

phone 6.3"

iPhone 16 Pro

2622 x 1206

monitor 27"

27" Monitor

2560 x 1440

tv 65"

65" TV

3840 x 2160

Browse All Devices

How Screen Size Calculation Works

Enter Diagonal Size

Input your screen's diagonal measurement in inches or centimeters.

Select Aspect Ratio

Choose your display's aspect ratio (16:9, 16:10, 4:3, etc.).

Get Instant Results

See width, height, area, PPI, and total megapixels instantly.

The Math Behind It

Screen dimensions are calculated using the Pythagorean theorem:

Height = diagonal / sqrt(1 + (w/h)^2)

Width = Height * (w/h)

PPI = sqrt(px_width^2 + px_height^2) / diagonal

Common Screen Sizes Reference

Smartphone

Size: 5.5" - 6.7"

Resolution: 1080 × 2400

PPI: 380 - 450

Tablet

Size: 10" - 12.9"

Resolution: 2560 × 1600

PPI: 220 - 280

Monitor

Size: 24" - 32"

Resolution: 2560 × 1440

PPI: 90 - 120

4K TV

Size: 50" - 75"

Resolution: 3840 × 2160

PPI: 55 - 90

Projector

Size: 100" - 150"

Resolution: 1920 × 1080

PPI: 10 - 20

Calculator

Calculate any screen size

Custom aspect ratios

PPI & viewing distance

Frequently Asked Questions

How do I calculate screen size from diagonal?

To calculate screen size from diagonal, you need the aspect ratio. Our calculator uses the Pythagorean theorem automatically - just enter your diagonal size and aspect ratio.

What is PPI and why does it matter?

PPI (Pixels Per Inch) measures pixel density. Higher PPI means sharper images. Desktop monitors typically have 90-110 PPI, while smartphones have 300-500 PPI.

What is the most common aspect ratio?

16:9 is the most common aspect ratio for monitors and TVs, used for HD, Full HD, and 4K content.

What size TV should I buy for my living room?

For a living room with 8-12 feet viewing distance, a 55-65 inch 4K TV is ideal. Use our TV mode calculator to determine the optimal viewing distance based on your room size.

How far should I sit from a 55 inch TV?

For a 55 inch 4K TV, the optimal viewing distance is 7.3 feet (2.2m). The comfortable range is 4.6-11.5 feet. HD TVs require slightly more distance.

What is projector throw distance?

Throw distance is how far the projector must be from the screen. It's calculated by multiplying screen width by the projector's throw ratio (typically 1.5 for standard projectors).

What is the difference between 4K and 1080p viewing distance?

With 4K TVs, you can sit closer without seeing pixels - about 1.0x the screen diagonal. 1080p TVs need 1.5-2.0x the diagonal for comfortable viewing.

Find Your Perfect Screen Size

Whether you're shopping for a new TV, upgrading your monitor, or comparing phone displays - use our calculator to make an informed decision.

Calculate Your Screen Size Now