Output dimensions
1920 x 1080 px
Ratio 16:9
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Aspect Ratio Calculator
4:3, 16:9, and 1:1 crop math.
Aspect Ratio Calculator
Calculator
Calculated Results
Width
1920 px
Height
1080 px
Turn a ratio preset into exact pixels
Video, social, and print layouts speak in ratios (16:9 widescreen, 1:1 square feed, 9:16 vertical). Enter one known side and this tool returns the other in pixels.
Default 1920 x 1080 px is Full HD 16:9. Switch preset to 1:1 with 1080 px width and height becomes 1080 px.
Copy exports width, height, and ratio label for tickets, CSS aspect-ratio notes, or editor crop guides.
Pair ratio math with image tools
After you know pixel dimensions, resize files with the Image Dimension Resizer.
Center crop offsets for a photo size use the Image Crop Ratio Calculator.
Export icons from SVG through the SVG to PNG Converter at the computed square size.
Common ratio use cases
16:9 for YouTube thumbnails and presentation slides. 1:1 for profile avatars and Instagram grid tiles. 9:16 for Stories and Shorts vertical frames.
Custom ratio covers cinematic 2.39:1 or legacy 5:4 print when presets do not match your brief.
Rerun when you change delivery size (720p vs 1080p vs 4K) while keeping the same ratio.
Frequently Asked Questions (FAQ)
Which aspect ratio presets are included?
16:9, 4:3, 1:1, 9:16, and 3:2, plus custom width-to-height ratio. Default: 1920 px width at 16:9 yields 1080 px height.
Can I calculate from height instead of width?
Yes. Choose "I know the height" and enter height in pixels. Width is computed from the selected ratio.
How is the missing side calculated?
If you know width: height = width x (ratio height / ratio width). If you know height: width = height x (ratio width / ratio height). Results round to whole pixels.
Does this crop my image?
No. This page outputs dimensions only. Use the Image Crop Ratio Calculator for center crop box math on an existing photo size.