Keep the ratio. Change the size.
Enter an original width and height, then calculate a matching new dimension without distorting the proportions.
Everything is calculated in your browser. Nothing is uploaded.
MODE 1
Find the ratio
4:3
1600 x 1200 simplifies to 4:3
Enter a width and a height greater than zero.
MODE 2
Ratio plus width
1500 px
Height for 1200 px at 4:5
Ratio values must be greater than zero.
MODE 3
Ratio plus height
1920 px
Width for 1080 px at 16:9
Ratio values must be greater than zero.
QUICK RATIOS
Apply a common ratio
Clicking a ratio fills both Mode 2 and Mode 3.
Aspect ratios describe proportional relationships rather than fixed pixel sizes. A 4:5 image can be 800 x 1000, 1200 x 1500 or any other dimensions using the same proportion.