Design / free browser tool

Aspect Ratio & Image Dimension Calculator

Work out proportional image sizes, reduce ratios and compare common presets.

Calculate proportional dimensions

Image width (pixels)

Image height (pixels)

Common ratio

New target width (pixels)

Ready when you are.

Helpful context

Does this tool resize actual image files?

No. It calculates the correct dimensions. Use our image resizer tool to process and download a real image.

Why might there be a one-pixel difference?

Whole-pixel image dimensions require rounding. The calculator rounds proportional height to the nearest pixel.

Can I type a very large resolution?

Whole-number dimensions from 1 to 100,000 pixels are accepted for mathematical planning; actual image processing may have lower limits.

Keep creating

Design

Resize and export the actual image after planning its dimensions.

Design

Check foreground and background readability.