Display Size Calculator – Find Screen Diagonal, Aspect Ratio & Area
Instantly calculate your smartphone’s screen diagonal size, aspect ratio, and total display area using width and height dimensions. Our free display size calculator uses the screen size formula to deliver accurate results for any device. Whether you’re comparing phones or verifying specs, this phone screen size calculator works 100% in your browser — no signup required.
Display Size Calculator
Calculate diagonal screen size, aspect ratio & display area
Display Size Calculator Features
- Calculates the diagonal screen size in inches from width and height dimensions
- Computes the exact aspect ratio of any display automatically
- Determines total screen area in square inches
- Accepts decimal input values for precise measurements
- Instant results with reset functionality
- Works for any smartphone, tablet, or monitor screen
How to Use Display Size Calculator
- Enter the screen width in inches (e.g., 2.95) in the “Screen Width” field
- Enter the screen height in inches (e.g., 6.37) in the “Screen Height” field
- Click the Calculate button
- View the diagonal size in inches, aspect ratio, and screen area in square inches in the results section
- Click Reset to clear all fields and start over
Frequently Asked Questions
To calculate display size, measure the screen width and height in inches or millimeters, then use the Pythagorean theorem: diagonal = √(width² + height²). Our display size calculator does this instantly for you.
The screen size formula is: Diagonal = √(Width² + Height²). This gives the diagonal screen measurement, which is how smartphone screens are officially measured and marketed.
Yes, display size and screen size refer to the same measurement — the diagonal length of the visible screen area, measured in inches from one corner to the opposite corner.
Divide the width by the height (or vice versa) and simplify to the smallest whole number ratio. For example, a 2160×1080 screen gives a 2:1 ratio (18:9 simplified). Our tool calculates this automatically.
Display area is the total surface area of the screen, calculated by multiplying the physical width by the physical height. It’s expressed in square inches or square centimeters and tells you how much visual real estate the display offers.
Yes! The display size calculator works for smartphones, tablets, monitors, laptops, and any rectangular screen — simply enter the width and height dimensions in your preferred unit.
Diagonal measurement became the industry standard because it captures the full size of a screen with one number, regardless of aspect ratio, making comparisons simpler across different device form factors.
Related Tools
Calculate true upgrade cost — phone upgrade cost calculator and smartphone upgrade trade-in value estimator free.
Plan smartphone accessories cost — phone accessories budget planner and mobile accessories calculator budget tool free.
Visualize smartphone depreciation calculator — phone value over time with interactive mobile depreciation chart free online.
Calculate AOD battery drain — always on display battery calculator measures AOD vs battery life impact free.
Calculate phone brightness drain and brightness battery impact — screen brightness battery calculator for display battery life free.
Calculate OLED dark mode savings — dark mode battery calculator estimates dark theme battery life gains free.
Compare f-stop values — aperture comparator calculator measures camera aperture light difference and exposure stops free.
Calculate cold weather battery and hot temperature battery loss — battery temperature impact calculator for smartphones free.
Calculate phone battery gaming life — gaming mode battery drain and smartphone gaming drain estimator free.