Image Resolution Calculator
Calculate DPI, megapixels, and estimated file size for an image at a given print size. Essential for photographers and print designers.
How to Use the Image Resolution Calculator
- Enter image width and height in pixels.
- Enter the desired print width in inches.
- Click Calculate to get DPI, megapixels, and file size.
使用场景
- •Checking if a photo has sufficient resolution for print.
- •Calculating megapixel requirements for product photos.
- •Sizing images for specific print dimensions.
- •Teaching digital photography concepts.
公式
DPI = Width (px) / Print Width (inches). Megapixels = Width × Height / 1,000,000. File size ≈ Width × Height × 3 bytes.
常见问题
What DPI is good for print?
300 DPI is the standard for high-quality print. 150 DPI is acceptable for large-format prints viewed from a distance.
What is a megapixel?
One megapixel equals one million pixels. A 3000×2000 image has 6 megapixels.
Why is the file size estimate approximate?
The estimate assumes uncompressed RGB. JPEG, PNG, and other formats compress differently, resulting in smaller files.