Image File Size Calculator

Image File Size is evaluated from Image Width, Image Height and Bit Depth. The calculation reports Uncompressed Size, JPEG Estimate and PNG Estimate.

Results

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About the Image File Size Calculator

Image File Size is treated here as a quantitative relation between Image Width, Image Height and Bit Depth and Uncompressed Size, JPEG Estimate, PNG Estimate and Megapixels.

The calculator uses a multi formula configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.

Formula basis:
Raw bytes = Width x Height x 3 bytes/pixel (8-bit RGB)
JPEG approximately raw/10, PNG approximately raw/2

Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.

Formula & How It Works

The calculation applies the following relations exactly as recorded in the metadata:

Raw bytes = Width x Height x 3 bytes/pixel (8-bit RGB)
JPEG approximately raw/10, PNG approximately raw/2

Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.

Worked Examples

Example 1: 12MP smartphone photo: 4000×3000 pixels, 8-bit

Inputs

img_w: 4000 img_h: 3000 bit_depth: 8
Uncompressed Size: 34.33 MB. JPEG Estimate: 3.43 MB. PNG Estimate: 17.17 MB. Megapixels: 12 MP

With Image Width = 4,000, Image Height = 3,000 and Bit Depth = 8 as the stated inputs, the result is Uncompressed Size = 34.33 MB, JPEG Estimate = 3.43 MB and PNG Estimate = 17.17 MB. Each value corresponds to the declared output fields.

Example 2: 4K camera frame: 3840×2160, 8-bit

Inputs

img_w: 3840 img_h: 2160 bit_depth: 8
Uncompressed Size: 23.73 MB. JPEG Estimate: 2.37 MB. PNG Estimate: 11.87 MB. Megapixels: 8.29 MP

With Image Width = 3,840, Image Height = 2,160 and Bit Depth = 8 as the stated inputs, the result is Uncompressed Size = 23.73 MB, JPEG Estimate = 2.37 MB and PNG Estimate = 11.87 MB. Each value corresponds to the declared output fields.

Example 3: RAW photo from Canon EOS R5: 8192×5464, 16-bit

Inputs

img_w: 8192 img_h: 5464 bit_depth: 16
Uncompressed Size: 256.13 MB. JPEG Estimate: 25.61 MB. PNG Estimate: 128.06 MB. Megapixels: 44.76 MP

With Image Width = 8,192, Image Height = 5,464 and Bit Depth = 16 as the stated inputs, the result is Uncompressed Size = 256.13 MB, JPEG Estimate = 25.61 MB and PNG Estimate = 128.06 MB. Each value corresponds to the declared output fields.

Example 4: Web banner image: 1200×628, 8-bit (standard Open Graph)

Inputs

img_w: 1200 img_h: 628 bit_depth: 8
Uncompressed Size: 2.16 MB. JPEG Estimate: 0.22 MB. PNG Estimate: 1.08 MB. Megapixels: 0.75 MP

With Image Width = 1,200, Image Height = 628 and Bit Depth = 8 as the stated inputs, the result is Uncompressed Size = 2.16 MB, JPEG Estimate = 0.22 MB and PNG Estimate = 1.08 MB. Each value corresponds to the declared output fields.

Common Use Cases

  • Estimate storage needed for image files
  • Compare file sizes of different image formats
  • Plan storage for photography projects