Aspect Ratio & Scale
Quickly calculate aspect ratios, simplify resolutions, or find missing scale dimensions. Watch the visualizer box adjust its shape dynamically in real-time.
What is an Aspect Ratio?
An aspect ratio is the proportional relationship between the width and height of an image or screen. It is typically expressed as two numbers separated by a colon, such as 16:9. The first number represents the width, and the second represents the height.
Common Aspect Ratios
| Ratio | Common Name | Best For |
|---|---|---|
| 16:9 | Widescreen | Standard TV, YouTube, Gaming |
| 16:10 | Tall Widescreen | MacBooks, Office Monitors, Coding |
| 21:9 | Ultrawide | Cinematic Movies, Multitasking |
| 4:3 | Standard (Retro) | iPads, Old CRT TVs |
| 9:16 | Vertical / Portrait | TikTok, Instagram Reels, Shorts |
Frequently Asked Questions
Everything you need to know about screen shapes and aspect ratios.
How do you calculate aspect ratio?
To calculate aspect ratio, find the Greatest Common Divisor (GCD) of the width and height, and then divide both numbers by the GCD. For example, for a 1920x1080 screen, the GCD is 120. Dividing 1920 and 1080 by 120 gives 16 and 9, which is a 16:9 aspect ratio.
How do I calculate the aspect ratio of an image?
To calculate an image's aspect ratio, divide its width in pixels by its height. For example, a 1200x800 image has a decimal ratio of 1.5. This translates to a 3:2 aspect ratio, common in photography.
What is the most common monitor aspect ratio?
16:9 is the most common monitor aspect ratio today. It is the international standard format for high-definition television (HDTV), Full HD (1080p), and 4K UHD. Almost all video content is optimized for 16:9 screens.
Is 16:10 better than 16:9 for programming?
Many programmers and office workers prefer 16:10 over 16:9 because it provides extra vertical screen space. A 16:10 monitor (like a 1920x1200 display) allows you to see more lines of code or read more of a document without scrolling.
How does aspect ratio affect screen scaling?
Aspect ratio determines the physical shape of a screen. If you display content with a different aspect ratio than your monitor (e.g., watching a 16:9 movie on a 21:9 ultrawide monitor), you will see black bars (letterboxing on the top/bottom or pillarboxing on the sides) to fill the empty space.
What is the aspect ratio of Instagram Reels and YouTube Shorts?
The standard aspect ratio for Instagram Reels, YouTube Shorts, and TikTok is 9:16. This is a vertical video format optimized for smartphones, typically with a resolution of 1080x1920 pixels.
What is the aspect ratio of a passport size photo?
While it varies slightly by country, a standard US passport size photo (2x2 inches) has an aspect ratio of 1:1 (square). Other regions often use formats close to a 4:5 or 3:4 aspect ratio.
Can I use this tool as an aspect ratio converter or changer?
Yes, this tool acts as an aspect ratio calculator and converter. By locking the ratio and changing one dimension, you can easily calculate new dimensions to change the aspect ratio of an image or video project.
Recommended Technical Guides
8 min read
1080p vs 1440p vs 4K: Which Resolution Is Right For You in 2026?
Comprehensive comparison of 1080p, 1440p, and 4K resolutions for gaming, work, and creative use. Find out which screen resolution is worth it in 2026 based on your monitor size, GPU, and viewing distance.
5 min read
What is Screen Resolution? A Plain-English Guide
Screen resolution is the number of pixels displayed on your screen horizontally and vertically. Learn what resolution means, the difference between HD, Full HD, QHD, and 4K, and how to check and change your display resolution.
5 min read
What is PPI? Pixels Per Inch Explained Simply
PPI (Pixels Per Inch) measures how many pixels are packed into one inch of a display screen. Learn what PPI means, how it affects image quality, and what a good PPI is for monitors, phones, and TVs.