Aspect Ratio Calculator
Free aspect ratio calculator — Calculate aspect ratios from width and height, find missing dimensions, resize images proportionally, and compare screen ratios. Includes a full table of standard display and video aspect ratios.
Quick Presets
Aspect Ratio
16:9
Decimal: 1.7778:1
Nearest Standard Ratio
16:9
What Is Aspect Ratio?
The aspect ratio of a rectangle is the ratio of the length of the longer side to the length of the shorter side.
For displays and images the aspect ratio is the ratio of width to height, for example, 16:9 or 2.35:1.
For any screen display or image you can calculate the aspect ratio if you know the width and height in pixels. You can also calculate aspect ratio from other measurements like inches or centimeters.
Since aspect ratio describes only the proportion of width to height, a unit label is optional. However it is important that all measurements are in the same units.
This calculator finds aspect ratio given width and height. The answer also provides the nearest standard display or image aspect ratio compared to your calculated ratio.
If you already know the aspect ratio you can calculate width given height, or height given width. To resize an image input the current dimensions and either your target height or target width. The calculator finds the length of the missing dimension. You can also compare the aspect ratios of two different screens or images.
How to Calculate Aspect Ratio
There are two ways to calculate aspect ratio as width to height w:h. One method gives you the ratio as a decimal w in proportion to h=1. The other method lets you find the aspect ratio where both w and h are whole numbers.
Method 1: Calculate Aspect Ratio as a Decimal
- Measure width w and height h.
- Divide width by height to find the quotient q.
- Using the quotient to represent the dimension of width the aspect ratio is q:1.
- So for every unit of height there are q units of width.
Method 2: Calculate Aspect Ratio as Whole Numbers
- Measure width w and height h.
- Find the Greatest Common Factor (GCF) of the width and height.
- Divide both numbers by the GCF.
- Using the reduced width and height the aspect ratio in whole numbers is w:h.
Example Aspect Ratio Calculation
Say your computer monitor is 1920 pixels wide and 1080 pixels high.
aspect ratio = (width / height) : 1
1920 / 1080 = 1.7778 ≈ 1.78:1
To calculate as whole numbers, find the Greatest Common Factor of 1920 and 1080. Since the GCF is 120, divide both width and height by this number.
1920 / 120 = 16
1080 / 120 = 9
So the aspect ratio in whole numbers is 16:9. Screens with this ratio are commonly referred to as 16:9 or 1.78:1.
What is Aspect Ratio Used For?
Aspect ratio tells you the relationship between the width and height of displays or digital media. Displays like computer monitors, laptops, phone screens, TVs and movie screens come in different widths and heights. Digital media is displayed on these devices and it must be sized proportionately to display correctly on any device.
It is also important to understand aspect ratio if you are editing images or videos. If you need to resize a digital image it is easy to quickly use image editing software to change the size of your image. But if you don't use the same aspect ratio for your resized image, your image may appear stretched or compressed. Or you may lose part of the image as a result of cropping.
If you are creating digital videos or images to post on a social media platform, make sure to check on the required aspect ratios for each platform. Videos created for TikTok, LinkedIn, Facebook, Instagram, Snapchat, YouTube, or Vimeo should comply with the standard aspect ratio stated by each platform.
Aspect ratio is also critical in creating social media or website ads. There are banner ads which are short but wide, tower ads which are narrow but tall, and square or rectangular ads where width and height ratios are less extreme. Check with the ad platform for preferred ad unit dimensions and aspect ratios.
Standard Aspect Ratios in Use
The following table provides standard aspect ratios in current use among displays, images and video. Click any row to calculate that ratio above.
| Aspect Ratio W:H | Width W | Height H | W/H |
|---|---|---|---|
| 9:16 | 9 | 16 | 0.563 |
| 3:4 | 3 | 4 | 0.750 |
| 16:18 | 16 | 18 | 0.889 |
| 1:1 | 1 | 1 | 1 |
| 5:4 | 5 | 4 | 1.250 |
| 4:3 | 4 | 3 | 1.333 |
| 1.37:1 | 1.37 | 1 | 1.370 |
| IMAX 1.43:1 | 1.43 | 1 | 1.430 |
| 3:2 | 3 | 2 | 1.500 |
| 14:9 | 14 | 9 | 1.556 |
| 16:10 | 16 | 10 | 1.600 |
| 5:3 | 5 | 3 | 1.667 |
| 16:9 | 16 | 9 | 1.778 |
| 1.85:1 | 1.85 | 1 | 1.850 |
| 17:9 | 17 | 9 | 1.889 |
| 2:1 | 2 | 1 | 2 |
| 2.165:1 | 2.165 | 1 | 2.165 |
| 20:9 | 20 | 9 | 2.222 |
| 21:9 | 21 | 9 | 2.333 |
| 2.35:1 | 2.35 | 1 | 2.350 |
| 64:27 | 64 | 27 | 2.370 |
| 24:10 | 24 | 10 | 2.400 |
| 22:9 | 22 | 9 | 2.444 |
| 32:10 | 32 | 10 | 3.200 |
| 32:9 | 32 | 9 | 3.556 |
| 4:1 | 4 | 1 | 4 |
Frequently Asked Questions
What is the most common aspect ratio for monitors?+
What aspect ratio is 1920×1080?+
What is the difference between 16:9 and 4:3?+
How do I resize an image without distortion?+
What aspect ratio should I use for social media?+
What does aspect ratio mean in film?+
How do I find the aspect ratio of my phone screen?+
What is the GCF method for finding aspect ratio?+
How to use Aspect Ratio Calculator
Simply enter the values in the input fields provided above. Results will update automatically as you type, allowing for instant calculations and side-by-side comparisons.
Our calculators use high-precision mathematical engines to ensure that even the smallest decimal movements are captured accurately.
If you're using this tool on a mobile device, the layout will automatically adjust for touch-friendly interaction. You can save this page to your home screen for quick access.