Image File Size Calculator
Estimate uncompressed image file size from dimensions.
- Reading time:
- 2 min
- Last updated:
- Price:
- Free, no signup
Type or paste text to see the result.
What the Image File Size Calculator does
Estimate image storage size from pixel dimensions, color depth, and compression assumptions.
Estimate how much storage an image will take from its pixels, color depth, and compression.
Why the Image File Size Calculator is useful
Pixel count helps compare image dimensions, but raw and compressed file sizes differ substantially.
Planning bandwidth and storage budgets needs a size estimate before files exist, and guessing megabytes by feel is unreliable.
Also known as: image size calculator, image file size, image dimensions to bytes, free image file size calculator, online image file size calculator, image file size calculator online free, image file size calculator tool.
How to use the Image File Size Calculator
- 1
Describe the image
Enter pixel width and height, choose a color depth, and pick a compression assumption.
- 2
Adjust and process
Enter width, height, and format or color-depth assumptions, then review the estimated size.
- 3
Compare with the budget
Compare the estimate against your limit, then adjust dimensions or quality in the plan.
Key features
- Calculates pixel count and uncompressed estimates
- Compares common channel and bit-depth assumptions
- Clarifies that compressed file size varies
Benefits
- Planning with numbers beats discovering the true weight after upload.
- Uncompressed and compressed estimates are shown together for comparison.
Real-life use cases
Storage budgets
Budget gallery storage for a photography site before shooting begins.
Upload limits
Check whether a batch of thumbnails fits a fixed upload allowance.
Tips for the best results
- Treat estimates as planning guidance; JPEG, WebP, and PNG compression depend on content and settings.
- Real compression varies with image content, so treat the figure as an estimate with margin.
Conclusion
Validate the estimate against one real export when the budget is tight, as actual compression varies with image content.
Frequently asked questions
Is the estimate the exact file size?
- No, compression makes actual size variable.
What is an uncompressed estimate?
- Pixel count multiplied by bits per pixel.
Do dimensions include DPI?
- No, pixel dimensions are the primary input.
Why is a PNG larger than expected?
- Lossless compression can preserve complex image detail at higher size.
Does it read my image?
- It can calculate from entered dimensions.
Is any data uploaded?
- No.
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