Design
Aspect Ratio Calculator
Reduce width and height to a simple ratio, or calculate the missing dimension from a target ratio.
Aspect ratio calculator
Reduce a width-height ratio and calculate scaled dimensions.
- 1Input
- 2Run
- 3Result
Processed on this device
Result
Your result will appear here.
Examples
- 1920 × 1080 → 16:9
- At 4:3, width 1200px → height 900px
Accuracy & limitations
- The calculation assumes standard square pixels.
- It does not account for crop area, focal point, or image-quality loss during resizing.
Frequently asked questions
Can I enter decimal dimensions?
Source width and height must be positive pixel integers. The target dimension may be a decimal value.
Will a 16:9 image be cropped when changed to 4:3?
The tool only calculates ratios. Choose fit, padding, or crop separately for your use case.