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Image & Photo Calculators

Image Resize Calculator

New image dimensions that keep the aspect ratio, from a target width, height or percentage.

Enter values

Results update as you type.

Result

New dimensions

1280 × 720 px

Exact width
1,280 px
Exact height
720 px
Scale factor
0.66667 ×
Percentage of original
66.67%
Aspect ratio kept
16 : 9
New megapixels
0.922 MP
File size change (approx)
44.4% of the original

About the Image Resize Calculator

New image dimensions that keep the aspect ratio, from a target width, height or percentage.

Also known as: aspect ratio resize, proportional resize calculator, scale image dimensions, resize keeping ratio.

How to use this calculator

  1. Enter original width, original height, resize by and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

new height = new width ÷ original aspect ratio

Worked example

Using the values pre-filled in the calculator above:

  • Original width = 1,920 px
  • Original height = 1,080 px
  • Resize by: Target width
  • Target width = 1,280 px

the calculator returns:

  • New dimensions: 1280 × 720 px
  • Exact width: 1,280 px
  • Exact height: 720 px
  • Scale factor: 0.66667 ×