What this calculator does
If you've ever opened a spreadsheet just to answer one developer & utility question, this image size calculator replaces the whole workbook: type the numbers, read the result.
Uncompressed image size from dimensions and bit depth.
How to use the Image Size Calculator
- Enter your input.
- The result updates automatically.
- Copy or share the result.
The formula
bytes = w × h × bpp / 8
Worked example
1920×1080 × 24 bpp = ~5.9 MB uncompressed.
Common mistakes
- Ignoring compression
- Confusing bits and bytes
- Alpha channel not counted
When to use it
Use for storage planning, print DPI checks.
Pro tips for the Image Size Calculator
- Use Print / PDF to export a clean, ad-free summary you can share with a client or advisor.
- The chart updates live — drag values up and down to build intuition for how the formula behaves.
- Change one input at a time to see which lever actually moves the answer the most.
Frequently asked questions
›JPEG size?
Typically 5–20× smaller than raw.
›PNG lossless?
Reduces but doesn't discard data.
›Bit depth?
24-bit color; add 8 for alpha.
›DPI?
For print — inches × DPI = pixels.
›WebP?
Smaller than JPEG for equal quality.
›Can I use this on mobile?
Yes — the image size calculator is fully responsive, and results, charts, and the share button all work on phones and tablets.
›Is the Image Size Calculator free to use?
Yes. Every calculator on CalcPilot, including the Image Size Calculator, is free with no sign-up, no watermark, and no export limit.
Embed this calculator
Drop the Image Size Calculator into your own site or blog post. Free to use — a small “Powered by CalcPilot” link is appreciated.
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