01
Image file size calculator formula
Multiply width by height to count pixels, then multiply by channels and bits per channel. Divide bits by eight for bytes and multiply by the image count for the full batch.
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Image File Size Calculator
Calculate uncompressed image data from pixel dimensions, channels, bit depth, and image count without pretending to know a compressed export size.
FREE TO USEA LOOK ATLAS TOOL
01 USE IT NOW02 NO ACCOUNT03 FIELD NOTES BELOW
WORKING INPUTS
Count the pixels before export.
LIVE RESULT
Uncompressed image data
5.93 MiB1 uncompressed image. Compressed export size remains unknown.TOTAL BITS49,766,400
EXACT BYTES6,220,800
BINARY KIB6,075 KiB
PER IMAGE5.93 MiB
11
THE DATA UNDER THE IMAGE
Count what every pixel carries.
Dimensions describe the canvas. Channels and bit depth describe the data stored at every pixel. Keeping that raw total separate from compression makes the estimate honest.
WORKING VIEW
5.93 MiBFULL-HD RGB
METHODwidth × height × channels × bits per channel × image count
WORKING NOTE1920 × 1080 px · 3 channels · 8 bits · 6,220,800 bytes
INPUTS → CLEAR OUTPUT
THE FIELD NOTES
Quick answer above. Better decisions below.
Use the result now, then read the practical notes for assumptions, examples, limitations, and the choices behind it.
FULL-HD RGB5.93 MiB
1920 × 1080 px · 3 channels · 8 bits · 6,220,800 bytes
02
Choose channels and bit depth
A grayscale image can use one channel, RGB uses three color channels, and RGBA adds an alpha channel. Bit depth states how many bits represent each channel sample.
03
Plan memory and batch data
Multiplying the per-image total by a declared image count gives a useful uncompressed batch estimate for editing, transfer planning, or pipeline sizing.
04
Why compressed file size stays unknown
JPEG, WebP, AVIF, and compressed PNG output depends on image content, encoder, quality, metadata, and format-specific structure. Pixel dimensions alone cannot predict an exact saved file size.
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Image file size calculator formula
Multiply width by height to count pixels, then multiply by channels and bits per channel. Divide bits by eight for bytes and multiply by the image count for the full batch.
The calculator keeps the exact bit and byte totals, then displays binary KiB and MiB using 1,024-byte steps.
Choose channels and bit depth
A grayscale image can use one channel, RGB uses three color channels, and RGBA adds an alpha channel. Bit depth states how many bits represent each channel sample.
Choose the structure you intend to work with. This numeric model does not inspect a real file or infer its color mode.
Plan memory and batch data
Multiplying the per-image total by a declared image count gives a useful uncompressed batch estimate for editing, transfer planning, or pipeline sizing.
The result excludes headers, metadata, row padding, thumbnails, layers, animation frames, and application overhead unless those are represented in the pixel inputs.
Why compressed file size stays unknown
JPEG, WebP, AVIF, and compressed PNG output depends on image content, encoder, quality, metadata, and format-specific structure. Pixel dimensions alone cannot predict an exact saved file size.
Use this result for raw pixel data. Use Image Size Checker after export when you need the exact bytes of a real file.
Questions, answered.
How do I calculate uncompressed image size?
Multiply width by height, channel count, and bits per channel. Divide the bit total by eight for bytes, then multiply by the number of images when planning a batch.
Is the result the exact JPEG, WebP, or PNG file size?
No. Compression, image content, quality settings, metadata, and format structure change saved file size. The calculator reports uncompressed pixel data only.
What is the difference between KiB and KB?
This tool uses binary units: one KiB is 1,024 bytes and one MiB is 1,048,576 bytes. It also shows the exact byte total.
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