Image Size Calculator

Image Size Formula:

Width = Original Width * ( Percentage / 100 )
Height = Original Height * ( Percentage / 100 )

Derive Width or Height Percentage by:
Percentage = Future Size / Original Size

Image Size Definition

Use our free online Image Size Calculator to do your image size calculations simple and easy! With so many uses possible for digital images, it’s important you get the size right. Sizing up your image in the wrong way could lead to images not fitting the use you have for them, or images that are unattractively stretched or squeezed.

Why Image Size is Important

Digital images use pixels to display their content. Each pixel is like a building block of an image; these building blocks are the base unit that make up what you see in a picture. That means it’s important to use the correct size if, for instance, you are scaling an image for use on a web page.

If you use an image that’s too large for the space it’s in, it will result in unsightly aliasing, or jagged looking edges. If you use an image that’s too small and needs to be stretched out, it will result in ugly pixellation, where the base pixels become large enough to be seen individually.

If you need to resize an image to a particular size, it’s important to choose the right percentage to scale your picture up or shrink it down. This calculator is very useful for choosing just the right size to scale your image to.

How to Use the Image Size Calculator

This calculator allows you to enter the following components:

1. Original height and width
2. Scaling percentage
3. Future height or width

Using the image size calculator is easy:

1. Enter the height and/or width of the image you need to scale.
2. Either enter a percentage that you wish to scale the image to, or enter the final size you wish your image to be in height, width, or both.
3. Click “calculate”

After submitting your figures, your calculations will display on the screen. If you entered a percentage, the new height or width will be displayed. If you entered a future height or width, the percentage needed to scale to that size will be displayed.

Things to Remember When Scaling Images

-Scaling an image larger will make the individual pixels of that image larger, as well. This will result in pixellation if you scale it too large.
-The height or width of your image in pixels is not the whole story. Use your image processor program to check what your image’s resolution, or dots per inch, is if you intend to print your image out. Some images may have the same number of pixels, but if the resolution is 72 DPI, it will print on paper much larger than if the resolution is 300.

How to Calculate Image Size

Let's be honest - sometimes the best image size calculator is the one that is easy to use and doesn't require us to even know what the image size formula is in the first place! But if you want to know the exact formula for calculating image size then please check out the "Formula" box above.

Add a Free Image Size Calculator Widget to Your Site!

You can get a free online image size calculator for your website and you don't even have to download the image size calculator - you can just copy and paste! The image size calculator exactly as you see it above is 100% free for you to use. If you want to customize the colors, size, and more to better fit your site, then pricing starts at just $29.99 for a one time purchase. Click the "Customize" button above to learn more!