🖼️ Image Ratio Calculator
Enter your image’s width and height to find its simplified aspect ratio and calculate a proportional resize.
How Aspect Ratio Is Calculated
An image’s aspect ratio describes the proportional relationship between its width and height, expressed as two simplified whole numbers, like 16:9 or 4:3. Knowing it helps you resize images without stretching or distorting them.
The Formula
The simplified ratio is found by dividing both the width and height by their greatest common divisor (GCD): Ratio = (Width ÷ GCD) : (Height ÷ GCD). To resize proportionally, a new height is calculated as New Height = New Width ÷ (Original Width ÷ Original Height), which preserves the same ratio.
This calculator is useful for photographers, designers, and web developers who need to crop, resize, or check image dimensions before publishing.