How do I calculate the actual width and height of my monitor?

Enter your monitor's diagonal size in inches and its aspect ratio (e.g., 16:9 for widescreen). The calculator uses the diagonal and aspect ratio to solve a right triangle, giving you the width and height in inches or millimeters, plus the total screen area.

Can I compare two different aspect ratios at the same diagonal size?

Yes, SizeCompare renders two screen rectangles at the same relative scale so you can visually see the width, height, and area differences between, for example, a 16:9 and a 21:9 display both set to 27 inches.

What aspect ratios does the Screen Size Calculator support?

Omni Calculator supports common ratios like 16:9, 16:10, 4:3, and also ultrawide (21:9), cinema (1:2.35), and custom ratios. SizeCompare offers presets for 16:9, 16:10, 3:2, 4:3, and 21:9/32:9.

Why do two screens with the same diagonal size have different areas?

A wider aspect ratio spreads the same diagonal across a broader but shorter rectangle, reducing total area. For example, a 27-inch 16:10 screen has slightly more area than a 27-inch 16:9 screen because the taller shape uses more of the diagonal for height.

Is the screen area important for productivity or gaming?

For productivity, a taller ratio like 16:10 or 3:2 often gives more vertical space for documents and web pages. For gaming, ultra-wide (21:9 or 32:9) provides a wider field of view, but you need a graphics card capable of driving the extra width.

Miscellaneous Calculators2 options compared

Screen Size Calculator

Calculates physical dimensions of screens, including height, width, and area, based on input like diagonal size or resolution. Useful for determining monitor specifications for home or office setups, ensuring proper screen fitment in various applications, or simply satisfying curiosity about a display's actual size. Helps users by providing accurate measurements to choose the right screen for...

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Editors’ Top PickBased on community votes

Omni Calculator

omnicalculator.com

The screen size calculator finds the physical dimensions such as height, width, and the area of the screen.

Open Omni Calculator Read review →

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SizeCompare
sizecompare.app
Calculate screen width, height, and area from diagonal and aspect ratio. Compare 16:9, 16:10, 3:2, 4:3, and ultrawide...
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Side by side

Screen Size Calculator options compared

Tool	Best for	Strengths	Limitations
Omni Calculator omnicalculator.com	Getting exact height, width, and area	Comprehensive geometric breakdown Supports many aspect ratios including ultrawide and cinema	No visual side-by-side comparison Requires manual input of diagonal and aspect ratio
SizeCompare sizecompare.app	Comparing aspect ratios side-by-side	True-ratio visual comparison Quick preset aspect ratios including ultrawide and 4:3	Only compares two screens at once Limited to preset aspect ratios

Buyer's guide

How to choose a screen size calculator

When you need a single screen's exact height, width, and area measurements, focus on whether the tool accepts your specific diagonal size and aspect ratio. If you are choosing between two actual displays or curious how different aspect ratios look relative to each other, a visual comparison matters more than raw numbers. The difference worth caring about is whether you need dimensions for a purchase decision (Omni Calculator) or a visual sense of how an ultrawide compares to a standard widescreen (SizeCompare).

Questions

Screen Size Calculator FAQ

How do I calculate the actual width and height of my monitor?: Enter your monitor's diagonal size in inches and its aspect ratio (e.g., 16:9 for widescreen). The calculator uses the diagonal and aspect ratio to solve a right triangle, giving you the width and height in inches or millimeters, plus the total screen area.
Can I compare two different aspect ratios at the same diagonal size?: Yes, SizeCompare renders two screen rectangles at the same relative scale so you can visually see the width, height, and area differences between, for example, a 16:9 and a 21:9 display both set to 27 inches.
What aspect ratios does the Screen Size Calculator support?: Omni Calculator supports common ratios like 16:9, 16:10, 4:3, and also ultrawide (21:9), cinema (1:2.35), and custom ratios. SizeCompare offers presets for 16:9, 16:10, 3:2, 4:3, and 21:9/32:9.
Why do two screens with the same diagonal size have different areas?: A wider aspect ratio spreads the same diagonal across a broader but shorter rectangle, reducing total area. For example, a 27-inch 16:10 screen has slightly more area than a 27-inch 16:9 screen because the taller shape uses more of the diagonal for height.
Is the screen area important for productivity or gaming?: For productivity, a taller ratio like 16:10 or 3:2 often gives more vertical space for documents and web pages. For gaming, ultra-wide (21:9 or 32:9) provides a wider field of view, but you need a graphics card capable of driving the extra width.

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