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Aspect Ratio Calculator
Calculate image and video dimensions
📐 Calculate from Dimensions
×
-:-
Aspect Ratio
🎬 Common Ratios
1:1
Square
4:3
Standard
16:9
Widescreen
21:9
Ultra-wide
9:16
Stories
4:5
Portrait
🔄 Resize by Ratio
:
📊 Calculated Dimensions
1920
Width (px)
1080
Height (px)
2.07
Megapixels
👁️ Visual Preview
16:9
📱 Common Screen Sizes
| Name | Dimensions | Ratio | Use Case | |
|---|---|---|---|---|
| HD | 1280 × 720 | 16:9 | YouTube, TV | |
| Full HD | 1920 × 1080 | 16:9 | Standard Video | |
| 4K UHD | 3840 × 2160 | 16:9 | High-res Video | |
| Instagram Square | 1080 × 1080 | 1:1 | Social Media | |
| Instagram Story | 1080 × 1920 | 9:16 | Stories, Reels | |
| Twitter Post | 1200 × 675 | 16:9 | Social Media |
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How to use the Aspect Ratio Calculator
- Enter a width and height to find the ratio.
- Or enter a ratio and one dimension to get the other.
- Use the presets for common video and social sizes.
Frequently asked questions
What ratio is Instagram?
Square is 1:1, portrait posts are 4:5, Reels and Stories are 9:16. YouTube is 16:9.
Does resizing change the ratio?
Scaling keeps the ratio. Cropping changes it. If a platform needs a different ratio, crop with the subject in mind rather than stretching.
Can I use it for print?
Yes. Enter the dimensions in any unit; the ratio is unit-independent.