Aspect Ratio Calculator
Free aspect ratio calculator for 16:9, 1:1, 9:16 and custom ratios. Enter width or height to get the other side. Runs in your browser.
Tool names, instructions and generated content may be provided in English.
1920 × 1080
About this tool
Work out Discord banners, YouTube thumbs, TikTok-style 9:16 posts or a custom ratio before you open the resizer. Presets cover the sizes we use most in the shop.
Enter one known side. The other is rounded to a whole pixel. Pair this with the image resizer when you already have a file.
How to use it
- Pick a preset or type a custom ratio.
- Enter either a width or a height.
- Read the matching pair, then resize your artwork if needed.
FAQs
What size is a Discord banner?
Profile banners are 600×240. Server invite splashes and YouTube art use different ratios — use 16:9 for most video thumbs.
Can I use a custom ratio?
Yes. Set both ratio fields, then enter width or height.
Does this edit my image?
No. It only calculates numbers. Use the image resizer to export pixels.