Performance
  • Free forever
  • No sign-up
  • Instant results

Image Size Estimator

Estimate the raw uncompressed file size of any image from its dimensions and bit depth. Includes a rough JPEG estimate so you can catch oversized assets before they ship.

Raw uncompressed size

When would you use this?

Before you start working with an image, or before you commit to exporting at a specific resolution, it's useful to know roughly how large it's going to be. This calculator gives you the raw uncompressed file size based on dimensions and bit depth, plus a rough estimate of the compressed JPEG size. It won't be exact since compression varies enormously with image content, but it'll tell you if you're heading toward a 5MB hero image before it's too late.

Common Questions

Why is the raw file size so much larger than the actual file?

What resolution should my web images be?