Image File Size Estimator

Estimate image file size from pixel dimensions, color depth, megapixels, and format (JPEG, PNG, WebP, AVIF, RAW).

Image File Size Estimator Live Calculation
Estimated Compressed File Size:
3.67 MB
In Kilobytes:3,672 KB
Total Resolution:24.0 Megapixels
Uncompressed 24-bit:72.0 MB
Image Estimate Note: Real JPEG/WebP sizes vary with image detail (a photo of detailed foliage is substantially larger than a photo of a clear blue sky at the same quality setting).

What is the Image File Size Estimator?

Helps photographers budget camera memory cards and web designers optimize images for fast page load performance.

How to Use This Tool

Enter image width and height in pixels or select common camera megapixels, pick a compression format, and see the estimated size.

Formula & Calculation Logic

The mathematical formula used to calculate this conversion is:

Uncompressed Raw Bytes = Width × Height × (Color Depth ÷ 8)

Step-by-Step Example Calculation

Here is a real-world calculation example demonstrating the mathematics:

Example: 24.0 Megapixel photo (6000 × 4000 pixels) at 24-bit color depth (3 bytes per pixel) Raw Uncompressed Data = 6000 × 4000 × 3 = 72,000,000 Bytes (72.0 MB decimal) Estimated Compressed Sizes at 85% Quality Setting: • JPEG / JPG (default format, 85% quality): Estimated Size = 72,000,000 × (0.06 × 0.85) = 3,672,000 Bytes = 3,672 KB ≈ 3.672 MB • WebP (modern web format, 85% quality): Estimated Size = 72,000,000 × (0.042 × 0.85) = 2,570,400 Bytes = 2,570.4 KB ≈ 2.570 MB • AVIF (next-gen high compression, 85% quality): Estimated Size = 72,000,000 × (0.030 × 0.85) = 1,836,000 Bytes = 1,836 KB ≈ 1.836 MB Note: Actual compressed file sizes vary based on visual complexity, noise, and encoder implementation. High-frequency textures (such as tree foliage or gravel) produce larger files, while smooth gradients or flat colors compress substantially smaller at the same quality setting.

Frequently Asked Questions

WebP offers ~25-35% smaller file sizes than JPEG at the same visual quality, while AVIF can reduce sizes by up to 50% with superior color rendition.

Pixel dimensions (resolution), image complexity (noise/textures compress worse than solid colors), and compression algorithm/quality setting.