1. What is Image File Size?

Image file size refers to the amount of storage space an image occupies, typically measured in kilobytes (KB) or megabytes (MB). It's determined by the image dimensions (width and height in pixels) and its bit depth (color depth).

2. How Does the Calculator Work?

The calculator uses the image size formula:

Where:

• \( Width \) — Image width in pixels
• \( Height \) — Image height in pixels
• \( Bit\_Depth \) — Number of bits used to represent each pixel
• 8 — Converts bits to bytes
• 1024 — Converts bytes to kilobytes

Explanation: The formula calculates the uncompressed size of an image. Actual file size may be smaller with compression (JPEG, PNG, etc.).

3. Importance of Image Size Calculation

Details: Understanding image size helps with storage planning, website optimization (page load times), and ensuring images meet platform requirements (social media, printing, etc.).

4. Using the Calculator

Tips: Enter width and height in pixels, and bit depth (typically 8 for JPEG, 24 for truecolor, 32 for RGBA). All values must be positive integers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between compressed and uncompressed size?
A: This calculator shows uncompressed size. Compression (JPEG, PNG) can significantly reduce actual file size while maintaining similar quality.

Q2: What are common bit depth values?
A: 1-bit (black/white), 8-bit (grayscale or indexed color), 24-bit (truecolor, 8 bits per RGB channel), 32-bit (truecolor with alpha channel).

Q3: How does resolution affect file size?
A: Doubling both width and height quadruples the file size, as size depends on total pixel count (width × height).

Q4: What's the size of a 4K image?
A: A 3840×2160 (4K UHD) 24-bit image would be about 23.7MB uncompressed (3840×2160×24/8/1024 = 24300KB).

Q5: How can I reduce image file size?
A: Reduce dimensions, lower bit depth (if possible), use appropriate compression, or convert to more efficient formats (WebP, JPEG 2000).