Output
Width, height and area
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Screen Size Calculator
Calculate screen width, height and area from diagonal and aspect ratio.
Free to useNo downloadNo sign-up
Screen Size Calculator · At a glance
Quick answer: Calculate screen width, height and area from diagonal and aspect ratio. Two screens with the same diagonal can have different widths and heights if their aspect ratios differ.
Screen Size Calculator
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Enter diagonal inches and aspect ratio to derive active width, height and area.
- Use the result to plan visible screen space.
Input
Values and units entered in the calculator
Browser requirement
Local arithmetic; no hardware access
Processing
Runs on your device; no tool-result upload
How it works and what the result means
The result is a mathematical estimate under the stated formula. It does not read your hardware or change system settings.
Reading the result
Two screens with the same diagonal can have different widths and heights if their aspect ratios differ.
Worked example and assumptions
width = diagonal × aspect width ÷ √(aspect width² + aspect height²)
A 27-inch 16:9 panel is approximately 59.77 cm wide and 33.62 cm high.
Diagonal inches are converted to centimeters. Bezels and stands are excluded.
A 27-inch 16:9 panel is approximately 59.77 cm wide and 33.62 cm high.
Diagonal inches are converted to centimeters. Bezels and stands are excluded.
What to check next
Do not include the stand or bezel when comparing active dimensions. Check the manufacturer outer dimensions for desk fit.
Keep consistent units and compare the assumptions with your actual game, display or network configuration.
Frequently asked questions
Will this tell me whether the monitor fits on my desk?
It calculates active panel dimensions. Add the actual bezel, stand depth and mounting clearance from the product specification.
How do I start the Screen Size Calculator?
Enter your own values and press Calculate. Units are shown beside each field; invalid or impossible values are rejected.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Will this change my device or game settings?
No. The calculator or generator only creates a result for you to review. It does not detect or modify your hardware, operating system or game configuration.
Why can another calculator show a different answer?
Compare the units, rounding and assumptions. The same inputs and formula give the same result here; background CPU load does not change the mathematics.