Aspect Ratio Calculator
Calculate height from width and ratio. For YouTube, images.
About this tool
This tool calculates height from width and aspect ratio in one click. Three features: 1) Enter width and ratio (16:9) for height, or height and ratio for width, 2) 16:9, 4:3, 1:1 presets, 3) Ideal for YouTube embed and image resize dimensions.
Tool interface
Usage
- Enter width and aspect ratio (16:9 etc.) for height
- Or enter height and ratio for width
- 16:9, 4:3, 1:1 presets available
When to use
YouTube embed sizing, image resize, responsive container height.
Examples
1920 × 16:9 → height 1080, 1080 × 16:9 → width 1920.
FAQ
What is 16:9 aspect ratio?
Width 16 to height 9. Standard for Full HD (1920×1080) and YouTube. Height = width ÷ (16/9).
How to calculate aspect ratio?
Height from width: height = width ÷ (width_ratio/height_ratio). E.g. 16:9, width 1920 → height = 1920 ÷ (16/9) = 1080.
What is 4:3 aspect ratio?
Traditional TV ratio. Width 1920 → height 1440. Taller than 16:9.
What is 1:1 aspect ratio?
Square. Used for Instagram feed, icons, thumbnails. Width equals height.
YouTube recommended aspect ratio?
16:9 standard. 1920×1080 or 1280×720. This tool calculates dimensions instantly.
How to get width from aspect ratio?
Width = height × (width_ratio/height_ratio). E.g. 16:9, height 1080 → width = 1080 × (16/9) = 1920.
How to maintain image aspect ratio?
Use object-fit: contain or aspect-ratio. This tool calculates dimensions first.
Aspect ratio vs resolution?
Aspect ratio = width:height (16:9). Resolution = pixels (1920×1080). Same ratio, different resolutions possible.
CSS aspect-ratio property?
aspect-ratio: 16/9 sets element ratio. Width auto-calculates height. This tool helps with the math.
Video aspect ratio types?
16:9 (YouTube), 4:3 (legacy), 1:1 (square), 9:16 (vertical). Use this tool to compute dimensions.
Is Aspect Ratio Calculator free?
Free to use, no sign-up required.
Is data sent to a server?
Data stays on your device; we do not store it on our servers.
Supported browsers?
Tested on recent Chrome, Edge, Firefox, and Safari.
Offline use?
Core features work offline after the first load.
vs CLI or desktop apps?
Aspect Ratio Calculator is an install-free online alternative to CLI or desktop apps.
When to use it?
Use it when: YouTube embed sizing, image resize, responsive container height.
Usage example?
Example: 1920 × 16:9 → height 1080, 1080 × 16:9 → width 1920.
Main features?
Width→height, height→width, 16:9, 4:3, 1:1 presets, Pixel output
How is this different from similar tools?
Aspect Ratio Calculator runs in the browser with no install—ideal for quick checks before heavier CLI or IDE workflows.
Search keywords
アスペクト比, 16:9, YouTube, 幅, 高さ, 縦横比 計算
Basic workflow
- Enter width and aspect ratio (16:9 etc.) for height
- Or enter height and ratio for width
- 16:9, 4:3, 1:1 presets available
Practical use cases
- YouTube embed sizing, image resize, responsive container height.
- This tool calculates height from width and aspect ratio in one click. Three features: 1) Enter width and ratio (16:9) for height, or height and ratio for width, 2) 16:9, 4:3, 1:1 presets, 3) Ideal for YouTube embed and image resize dimensions.
- Width→height, height→width
- 16:9, 4:3, 1:1 presets
Privacy & data handling
Data stays on your device; we do not store it on our servers.
Things to watch out for
- Always double-check before pasting output into production
- Try incognito if extensions break the page
- Wait for processing on large inputs