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Aspect Ratio Calculator
Aspect Ratio Calculator
What is this tool?
An aspect ratio calculator for images, video and screens. Enter a ratio and one dimension to get the other, or two dimensions to get the simplified ratio and decimal value — plus a live preview box in that exact proportion.
When to use it
- Resizing an image or video to a target width while keeping it in proportion
- Finding the height for a 16:9 embed at a given width
- Checking what ratio an existing set of dimensions works out to
- Setting up a canvas, thumbnail or ad slot at a standard ratio
- Converting a design between 4:3 and 16:9
How to use it
- 1Pick a ratio preset, or type a custom ratio like 16 : 9
- 2Enter either the width or the height in pixels
- 3Read the solved dimension in the results panel
- 4Check the simplified ratio and decimal value for the pair
- 5Use the preview box to see the proportion at a glance
Frequently asked questions
How does it simplify a ratio?
It divides both numbers by their greatest common divisor, so 1920 x 1080 reduces to 16:9.
Can I use non-integer dimensions?
Yes — decimals are accepted, and the solved dimension keeps two decimal places when it isn't whole.
Which dimension does it solve?
Whichever one you didn't type last — enter a width and it solves the height, and vice versa.
Is the calculation done locally?
Yes — it's pure arithmetic in your browser, nothing is uploaded.