Image File Size Calculator

Enter your image dimensions, bit depth, compression ratio, and card size to calculate file size, storage per shot, and how many photos fit on your card.

Created by Luis GonzalezLast updated: May 9, 2026

How to Use This Calculator

1
Enter Image Width
Input the horizontal resolution of your image in pixels.
2
Enter Image Height
Input the vertical resolution of your image in pixels.
3
Specify Bits per Pixel
Choose the color depth. 24-bit is standard for JPEG/TIFF (8 bits per RGB channel), while 48-bit (16 bits per channel) is common for high-bit RAW files.
4
Select File Format
Choose between RAW, JPEG, or TIFF. This influences default compression assumptions.
5
Enter Compression Ratio (optional)
If 'Custom' is selected, input how much the file is compressed relative to raw pixel data. 1x means no compression, 4x is typical for medium JPEG, 10x+ for high JPEG. RAW files are often 1x-2x.
6
Specify Memory Card Size
Input the total capacity of your memory card in gigabytes (GB).
7
Review Your Results
The calculator will display the estimated file size per image, total megapixels, and how many photos fit on your memory card.

Example Calculation

A photographer is shooting with a 24 MP camera (6000x4000 pixels) in RAW format (24-bit, 1x compression) on a 64 GB memory card and wants to estimate the file size per image and capacity.

Image Width (px)

6000

Image Height (px)

4000

Bits per Pixel (bit)

Compression Ratio (x)

Memory Card Size (GB)

File Format (select)

RAW

Results

68.66 MB

Tips

Choose the Right Compression

For web and general sharing, JPEG with a compression ratio of 8-12x (high quality) offers a good balance of quality and small file size. For archival or professional editing, use RAW (1-2x compression) or TIFF (1x compression) to retain maximum image data.

Factor in Camera Settings

Camera settings like ISO, noise reduction, and in-camera sharpening can subtly affect file size, even for the same resolution. Higher ISO settings often result in larger file sizes due to increased noise data that needs to be stored.

Monitor Memory Card Usage

Always carry spare memory cards, especially for professional shoots. While a 64 GB card might hold 900+ JPEGs, it will only store around 200 RAW files from a 24 MP camera. Plan your storage needs based on your shooting format and volume.

Optimizing Storage and Workflow for Digital Photography

The Image File Size Calculator is an indispensable tool for digital photographers and content managers, providing precise estimates of image file size in MB, megapixels, and how many photos will fit on a memory card. Understanding these metrics is critical for managing storage, optimizing workflows, and planning shoots effectively. For a 24-megapixel camera (e.g., 6000x4000 pixels) shooting 24-bit RAW files with no compression, each image can easily consume over 68 MB, meaning a 64 GB memory card will hold only around 930 such images.

The Math Behind Digital Image Storage

Calculating image file size involves understanding the fundamental components of digital image data: pixel count, color depth, and compression. The calculator first determines the total uncompressed pixel data based on resolution and bits per pixel. Then, it applies a compression ratio to estimate the final file size. This allows for informed decisions about image quality versus storage efficiency.

The core formulas are:

megapixels = (image width × image height) / 1,000,000
raw bytes = (image width × image height × bits per pixel) / 8
compressed bytes = raw bytes / compression ratio
file size (MB) = compressed bytes / (1024 × 1024)
images on card = (memory card size GB × 1024 MB/GB) / file size MB

For example, a 6000x4000 pixel image with 24 bits per pixel, uncompressed (1x ratio), would be: raw bytes = (6000 × 4000 × 24) / 8 = 72,000,000 bytes file size (MB) = 72,000,000 / 1,048,576 ≈ 68.66 MB

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Estimating Storage for a High-Resolution Shoot

A professional photographer is preparing for a shoot with a 24-megapixel camera, capturing images at 6000 pixels wide by 4000 pixels high. They plan to shoot in RAW format, which typically uses 24 bits per pixel and a compression ratio of 1x (uncompressed). They have a 64 GB memory card.

Input Image Width: Enter 6000 for Image Width (px).
Input Image Height: Enter 4000 for Image Height (px).
Input Bits per Pixel: Enter 24 for Bits per Pixel (bit).
Input Compression Ratio: Enter 1 for Compression Ratio (x).
Input Memory Card Size: Enter 64 for Memory Card Size (GB).
Select File Format: Choose RAW.

The calculation yields:

Megapixels = (6000 × 4000) / 1,000,000 = 24 MP
Raw Bytes = (6000 × 4000 × 24) / 8 = 72,000,000 bytes
File Size per Image = 72,000,000 / (1024 × 1024) ≈ 68.66 MB
Images on Card = (64 GB × 1024 MB/GB) / 68.66 MB/image ≈ 953.1 images. Rounded down to 953 photos.

This means each RAW image will consume about 68.66 MB, and the 64 GB card will hold approximately 953 such photos.

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Optimizing Storage and Workflow for Digital Photography

Efficient storage management is a cornerstone of modern digital photography. With camera sensors pushing resolutions beyond 45 megapixels, a single uncompressed RAW file can exceed 100 MB, quickly filling even large memory cards. Photographers must balance image quality requirements with practical storage constraints. For instance, while RAW files offer maximum post-processing flexibility, JPEGs with a 10:1 compression ratio (e.g., a 10 MB RAW becomes 1 MB JPEG) are often sufficient for web and many print applications, saving significant space. In 2025, cloud storage solutions and high-speed external SSDs are increasingly integrated into workflows, allowing for rapid offloading and archival of large image libraries, ensuring data integrity while optimizing local storage for active projects.

When Not to Use This File Size Estimate

While this calculator provides an excellent baseline, it offers an uncompressed or losslessly compressed estimate and may not perfectly reflect real-world file sizes for all formats. For highly complex or detailed images, JPEG's lossy compression algorithm can sometimes yield smaller files than expected, as it intelligently discards less perceptible information. Conversely, images with uniform areas or simple patterns might compress more efficiently than the estimated ratio suggests. Furthermore, formats like HEIF (High Efficiency Image File Format) or AVIF, which use more advanced compression techniques, will produce significantly smaller files than a simple pixel-to-byte calculation can predict. Always treat these estimates as a guide; actual file sizes may vary based on image content, specific compression algorithms, and camera-specific metadata.

Frequently Asked Questions

How is image file size calculated?

Image file size is primarily calculated based on its pixel dimensions (width × height), color depth (bits per pixel), and compression ratio. The total number of pixels is multiplied by the bits per pixel, then divided by 8 to get bytes, and finally adjusted by the compression ratio to estimate the final file size.

What is bits per pixel (color depth)?

Bits per pixel (bpp), or color depth, determines the number of distinct colors an image can display. A 24-bit image, common for JPEGs, uses 8 bits for each red, green, and blue channel, allowing for over 16 million colors. Higher bpp, like 48-bit (16 bits per channel), provides a wider tonal range, crucial for professional RAW files.

Does image resolution affect file size?

Yes, image resolution (pixel width × height) is a primary determinant of file size. Higher resolution images contain more pixels, requiring more data to store, which results in larger file sizes. A 45 MP image will inherently be much larger than a 12 MP image, assuming similar color depth and compression.

What is the typical compression ratio for JPEG files?

JPEG compression ratios vary widely depending on the quality setting. A medium-quality JPEG might have a compression ratio of around 4x to 8x, while a high-quality JPEG could be 10x or more. This means the compressed file is 4 to 10 times smaller than its uncompressed raw pixel data equivalent.