Need to calculate an image, video, or screen resolution? Our free Resolution Calculator makes it easy to find a missing width or height while keeping the correct aspect ratio. Enter the dimensions and aspect ratio you need, and the calculator will instantly show the result. You can use it for images, videos, monitors, websites, social media graphics, and other digital content.
What Is a Resolution Calculator?
A Resolution Calculator helps you work out the correct width and height of an image, video, screen, or other digital content while keeping the desired aspect ratio.
For example, if you have a width of 1920 pixels and a 16:9 aspect ratio, the calculator can determine that the corresponding height is 1080 pixels.
How to Use the Resolution Calculator
The calculator gives you three options:
- Height from Width & Aspect Ratio — Enter the width and aspect ratio to calculate the height.
- Width from Height & Aspect Ratio — Enter the height and aspect ratio to calculate the width.
- Aspect Ratio from Width & Height — Enter both dimensions to find the simplified aspect ratio.
Select the calculation you need, enter the values, and click Calculate.
What Is Resolution?
Resolution refers to the number of pixels used to describe the width and height of a digital image or display.
For example, 1920 × 1080 means the image or screen is 1,920 pixels wide and 1,080 pixels high.
Higher resolution generally means there are more pixels available to display detail, although the actual visual quality also depends on factors such as screen size, image quality, compression, and viewing distance.
Resolution vs. Aspect Ratio
Resolution and aspect ratio are connected, but they are not the same thing.
Resolution tells you the actual dimensions, such as 1920 × 1080.
Aspect ratio describes the relationship between those dimensions, such as 16:9.
For example:
- 1280 × 720 = 16:9
- 1920 × 1080 = 16:9
- 2560 × 1440 = 16:9
- 3840 × 2160 = 16:9
These resolutions are different sizes, but they all have the same aspect ratio.
How Do You Calculate a Missing Height?
If you know the width and aspect ratio, you can calculate the height using:
Height = Width × Ratio Height ÷ Ratio Width
For example, with a width of 1920 and a 16:9 aspect ratio:
1920 × 9 ÷ 16 = 1080
So the resulting resolution is 1920 × 1080.
How Do You Calculate a Missing Width?
If you know the height and aspect ratio, use:
Width = Height × Ratio Width ÷ Ratio Height
For example, with a height of 1080 and a 16:9 aspect ratio:
1080 × 16 ÷ 9 = 1920
The resulting resolution is 1920 × 1080.
Common Resolutions
Some commonly used resolutions include:
- 1280 × 720 — HD
- 1920 × 1080 — Full HD
- 2560 × 1440 — QHD
- 3840 × 2160 — 4K UHD
- 7680 × 4320 — 8K UHD
The exact use of these terms can vary depending on the device, industry, and content.
When Can You Use a Resolution Calculator?
A Resolution Calculator can be useful when:
- Resizing images
- Creating video content
- Designing website graphics
- Preparing social media images
- Creating thumbnails
- Working with monitor resolutions
- Maintaining an image's proportions
- Preparing presentations
- Designing digital content
Does Changing Resolution Change Aspect Ratio?
It can, but it does not have to.
If you resize an image while keeping the same proportional relationship between width and height, the aspect ratio stays the same.
For example:
1920 × 1080 → 1280 × 720
Both resolutions have a 16:9 aspect ratio.
If you change only one dimension without adjusting the other, the aspect ratio may change and the image can become stretched or distorted.
Frequently Asked Questions
What resolution is 16:9?
There are many 16:9 resolutions. Common examples include 1280 × 720, 1920 × 1080, 2560 × 1440, and 3840 × 2160.
What is 1920 × 1080?
1920 × 1080 is a resolution with 1,920 pixels across and 1,080 pixels vertically. It has a 16:9 aspect ratio and is commonly known as Full HD.
Can I calculate a missing dimension?
Yes. Enter one dimension and the desired aspect ratio, then choose the appropriate calculation option.
Can I calculate the aspect ratio from a resolution?
Yes. Choose Aspect Ratio from Width & Height, enter the width and height, and the calculator will simplify the ratio.
Does the calculator work with decimal values?
Yes. Decimal values can be used when calculating a missing width or height. For calculating an aspect ratio from pixel dimensions, use whole-number pixel values.
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