Aspect-Ratio Crop Calculator
Need a 16:9 crop from a 4:3 photo? Enter your image size and target ratio to get the largest possible crop, its position and how much of the image you keep.
Image & ratio
Target ratio
Crop
Crop size
6000 × 3375
Offset X
0 px
Offset Y
312 px
Image kept
84.4%
Removed
0 × 625 px
ffmpeg -vf crop=6000:3375:0:312
How to use the Aspect-Ratio Crop Calculator
- 1
Enter image width and height.
- 2
Choose or type a target ratio.
- 3
Use the crop size and offsets in your editor.
Helpful examples
- Crop a 6000 × 4000 photo to 16:9 for a video
- Get a 1:1 square from a 1920 × 1080 screenshot
- Crop a landscape photo to 4:5 for Instagram
The math
If the image is wider than the target ratio, height stays the same and width = height × ratio. Otherwise width stays and height = width ÷ ratio. Centered offsets are half the removed pixels on each side.
Use it in any editor
Enter the crop width, height and X/Y offsets into Photoshop, GIMP, Figma or ffmpeg for a pixel-perfect crop.
Frequently asked questions
Can I anchor the crop to the top or left?
Yes. Choose top/left, center or bottom/right anchoring and offsets update.
Why are results rounded?
Pixels are whole numbers, so crops are rounded down to stay inside the image.
Can I use decimal ratios like 2.39:1?
Yes, type any ratio such as 2.39:1.