What this calculator does
The ratio is reduced with the greatest common divisor. You can also enter a target ratio to see the largest centered crop that fits inside the source image.
Aspect ratio formulas
Simplified ratio = width ÷ GCD : height ÷ GCDTarget height = target width × ratio height ÷ ratio widthWorked examples
1400 × 1800 pixels
The simplified ratio is 7:9 and the orientation is portrait.
1600 × 1200 cropped to 16:9
The centered crop is 1600 × 900, removing 300 pixels of height in total.
Frequently asked questions
What does simplifying a ratio mean?
It divides both dimensions by their greatest common divisor, expressing the same shape with the smallest whole numbers.
Does the crop tool change my image?
No. It calculates the crop dimensions to reproduce in your editor.
Where is the calculated crop taken from?
The result assumes a centered crop, splitting the removed pixels evenly across opposite edges.
What if my ratio is almost 16:9?
The exact simplified ratio is shown. Small differences may come from rounding or dimensions chosen by a device or platform.