Image Dimension Calculator
Enter an image size (or load a photo) to get its aspect ratio, megapixels and print size, then change one side and Toolra keeps the proportions for you.
Image size
Resize proportionally
Type a new width or height, the other side is calculated.
Details
Resized to
1600 × 1200
39.7% of original
Aspect ratio
4:3
Exact
Decimal ratio
1.3333
Megapixels
12.19
12,192,768 px
Orientation
Landscape
Print size at 300 DPI
13.44 × 10.08 in
34.1 × 25.6 cm
How to use the Image Dimension Calculator
- 1
Enter width and height or load an image.
- 2
Type a new width or height.
- 3
Read the matching dimension and details.
Helpful examples
- Scale a 4032 × 3024 photo to 1600 px wide
- Find the print size of a 3000 × 2000 image at 300 DPI
- Check the aspect ratio of a 1366 × 768 screen
Proportional resizing
New height = new width × original height ÷ original width. Toolra rounds to whole pixels and shows the exact ratio, so images never look stretched.
Print size and DPI
Print size in inches is pixels divided by DPI. At 300 DPI, a 3000 px wide image prints 10 inches (25.4 cm) wide at photo quality.
Frequently asked questions
What is a good DPI for printing?
300 DPI for photos viewed up close, 150 DPI for posters viewed from a distance.
Is my image uploaded?
No. The image is only read locally to get its width and height.
Why is 1366 × 768 not exactly 16:9?
It simplifies to 683:384, which is about 1.779 — very close to 16:9 (1.778). Toolra shows both the exact and nearest common ratio.