Enter dimensions
Add the image or canvas width and height in pixels.
Free image utility
Image Aspect Ratio Calculator
Enter width and height to simplify an aspect ratio, or lock a ratio and calculate a matching dimension. Use the presets for common square, portrait, landscape, and vertical formats.
No signupInstant resultsProcessed in your browser
Calculated ratio
4:5
- Dimensions
- 1080 x 1350
- Decimal ratio
- 0.800
- Orientation
- Portrait
How it works
Useful results in three steps
Review the simplified ratio
See the reduced ratio, decimal value, and portrait, landscape, or square orientation.
Calculate a matching size
Lock the current ratio, edit one dimension, and calculate the other.
Format reference
Common aspect ratios
| Ratio | Orientation | Common use |
|---|---|---|
| 1:1 | Square | Thumbnails and square posts |
| 4:5 | Portrait | Feed graphics and infographics |
| 16:9 | Landscape | Presentations and video |
| 9:16 | Vertical | Stories and mobile video |
Troubleshooting
Avoid common resizing errors
The image looks stretched
Change one dimension and let the calculator preserve the original ratio.
The result needs whole pixels
Use the rounded result and verify the final crop in the publishing platform.
The platform crops the edges
Keep important text away from edges and inspect the platform preview.
Reference
Common aspect-ratio sizes
An aspect ratio describes proportion, not resolution. Multiple pixel dimensions can use the same ratio.
4:5 portrait
1080 × 1350
A compact portrait format commonly used for feed graphics and professional visuals.
9:16 vertical
1080 × 1920
A full-height vertical format used for stories, shorts, and mobile-first content.
16:9 landscape
1920 × 1080
A widescreen format for presentations, video frames, and landscape graphics.
Aspect ratio versus resolution
Aspect ratio is the relationship between width and height. Resolution is the number of pixels. Both 1080 × 1350 and 2160 × 2700 use a 4:5 ratio, but the second contains more pixels.
Matching the ratio prevents stretching and unexpected cropping. Sufficient resolution keeps the final image clear at its intended display size.
Choose dimensions for the destination
Start with where the visual will be viewed, then choose proportion and resolution.
- Use square or portrait formats for compact feed layouts.
- Use 9:16 for full-screen vertical experiences.
- Use 16:9 for widescreen presentations and video.
- Confirm current platform requirements before publishing.
Frequently asked questions
About the aspect ratio calculator
How do I calculate an image aspect ratio?
Divide width and height by their greatest common divisor. For example, 1080 × 1350 reduces to 4:5 because both dimensions divide evenly by 270.
What size is a 4:5 aspect ratio?
Common 4:5 dimensions include 1080 × 1350, 1200 × 1500, and 1600 × 2000 pixels. Any dimensions with the same proportional relationship are 4:5.
Is aspect ratio the same as image size?
No. Aspect ratio describes proportion, while image size or resolution describes actual pixel dimensions. Many image sizes can share one aspect ratio.
How do I calculate a missing width or height?
Select or enter the target ratio, lock it, and change one dimension. The calculator multiplies the known dimension by the corresponding ratio relationship.
Does changing dimensions crop my image?
This calculator does not edit an image. It only calculates proportions. An image editor may crop or add space when adapting an existing image to a different ratio.
Are my dimensions or images uploaded?
No image upload is required. Dimension and ratio calculations run locally in your browser and are not sent to an infoAIgraphic API.
How do I calculate a missing image dimension?
Enter the original width and height, then provide either the new width or new height. The calculator derives the missing dimension at the same ratio.
Does preserving aspect ratio prevent cropping?
It prevents stretching, but a publishing platform may still crop its preview to a different display ratio.
Related free tools
Related guides and workflows
From text to visual
You have the dimensions. Now create the visual.
Choose a supported aspect ratio and generate a professional infographic draft from your content.