Image Resize & Aspect Ratio Calculator
Scale an image's width or height while keeping its aspect ratio, and find the ratio (like 16:9) of any size.
New size
1,280 × 720 px
- Aspect ratio
- 16:9 (1.77778:1)
- Scale
- 66.6667%
- Exact size
- 1280 × 720 px
- Megapixels (new / original)
- 0.9216 / 2.074 MP
Show the work
Scale factor
k = new width ÷ width
1,280 ÷ 1,920 = 0.6666666667
Both sides times k, rounded to whole pixels
width × k, height × k
1,920 × 0.6666666667, 1,080 × 0.6666666667 = 1,280 × 720 px
How it works
New height = new width × (height ÷ width); aspect ratio = width : height divided by their greatest common divisor
Questions
- How does the image resize & aspect ratio calculator work?
- New height = new width × (height ÷ width); aspect ratio = width : height divided by their greatest common divisor.
- What do I need to enter?
- Original width, Original height, Resize by, New value. Optional fields can be left blank.
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