TECHNOLOGY
Uncompressed image size calculator
Estimate an uncompressed raster image or batch payload from pixel dimensions, channels, sample depth and byte-rounded scanlines.
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No regional currency, unit or language profile is applied. This choice does not convert values or change formulas, results, routes or legal guidance.
Estimate the raw pixel payload for one image or a batch. Scanlines are rounded up to a whole byte; compression, metadata and format headers are deliberately excluded.
Uncompressed image data result
- Pixels per image
- 2,073,600
- Bits per pixel
- 32
- Bytes per row
- 7,680 B
- Row padding
- 0 bits
- Bytes per image
- 8,294,400 B
- Total bytes
- 8,294,400 B
- Decimal size
- 8.2944 MB / 0.008294 GB
- Binary size
- 7.910156 MiB / 0.007725 GiB
This is an uncompressed raster payload estimate. Real files may add headers, metadata, row alignment or compression. The tool does not upload, inspect or store an image.
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Verification and calculation details
- Purpose
- Uncompressed image size calculator
- Variables and units
- Use the labelled fields and units shown in the calculator. Results use those units unless a conversion is stated.
- Formula and method
- The exact formula and worked example are shown below. Deterministic formula executed locally in the browser.
- Assumptions
- Only entered values and stated assumptions are included. Local fees, rules and professional requirements are excluded unless explicitly shown.
- Engine version
- 1.0.0
- Production verification baseline
- Release 63 · source
998803f - Verification run
release-v63-2026-09-20- Last verified
- — Automated release checks passing
Read the Calculation Standard · Report a calculation or source issue
How this calculator works
Bits per pixel = channels x bits per channel. Row bytes = ceiling(width x bits per pixel / 8). Image bytes = row bytes x height. Total bytes = image bytes x image count. Decimal MB/GB use powers of 1000; MiB/GiB use powers of 1024.
Variables and inputs
- Width
- Required numeric input. whole pixels; 1 to 100,000.
- Height
- Required numeric input. whole pixels; 1 to 100,000.
- Channels per pixel
- Required numeric input. whole number; 1 to 16.
- Bits per channel
- Required numeric input. whole number; 1 to 64.
- Number of images
- Required numeric input. whole number; 1 to 1,000.
How to interpret the result
The calculator returns pixels per image, bits per pixel, byte-rounded row size, row padding bits, bytes per image, batch bytes, decimal MB and GB, binary MiB and GiB. Read each output against the assumptions you entered, compare alternatives one variable at a time, and use the result as an estimate rather than a promise.
Common mistakes to avoid
- Mixing units or entering a rate as a decimal when the field requests a percentage.
- Rounding intermediate values instead of the final displayed result.
- Leaving out a cost, timing rule or local requirement listed in the assumptions below.
Practical uses
Use the uncompressed image size calculator to check a real scenario, compare a changed assumption and explain the arithmetic before relying on a quote, specification or decision.
Worked example
A 1920 x 1080 image with four 8-bit channels has 32 bits per pixel, 7,680 bytes per row and 8,294,400 bytes per image: 8.2944 MB or 7.91015625 MiB before format overhead or compression.
Assumptions and limitations
- width and height describe rectangular raster pixels
- channels means samples stored for each pixel
- sample depth is constant for every channel
- each row begins on a byte boundary
- images in a batch use the same dimensions and sample layout
- estimates an uncompressed raster payload, not a final PNG, JPEG, WebP, TIFF or other file size
- real formats may add headers, metadata, palettes, filters, compression or row-alignment padding
- does not estimate memory used by an application or graphics API
- does not upload, inspect or store image files
Important notes
Results are estimates based on the values entered. Confirm rates, prices, units and professional requirements that apply in your location. Review the Answer Atlas Calculation Standard and corrections policy for formula, privacy and correction rules.
Frequently asked questions
Why can the result differ from the file size on disk?
The calculator estimates raw scanline payload. File formats can add metadata and headers or reduce size through compression; some systems also impose extra row alignment.
What should I enter for channels?
Use the number of stored samples per pixel, such as 1 for grayscale, 3 for RGB or 4 for RGBA, when that matches your source data.
What is the difference between MB and MiB?
MB uses 1,000,000 bytes. MiB uses 1,048,576 bytes. Both are shown so the convention is explicit.