Calculate PPI/DPI, resolution to physical size, aspect ratio, and image file size
Utility Tools
About This Tool
Pixel Calculator is a multi-tab tool for screen and print calculations. It computes PPI/DPI from resolution and diagonal size, converts pixel dimensions to physical print size at a given DPI, calculates aspect ratios, and estimates uncompressed and compressed image file sizes based on dimensions and color depth.
Key Features
- PPI/DPI calculator with physical size output in inches and centimeters
- Resolution to print size converter with DPI input
- Aspect ratio calculator with simplified ratio and orientation detection
- Image file size estimator supporting 8-bit and 16-bit color depths
- Tab-based interface for quick switching between calculation modes
- All calculations run locally in your browser with no data uploaded
Use Cases
- Determine the pixel density of a monitor or mobile screen
- Calculate the physical print size of a digital image at a specific DPI
- Find the simplified aspect ratio of a screen or image resolution
- Estimate file sizes for uncompressed and compressed image formats
- Compare screen densities across different devices before purchasing
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Frequently Asked Questions
What is the Pixel Calculator?
The Pixel Calculator is an online tool that helps you calculate PPI/DPI, convert resolution to physical size, determine aspect ratios, and estimate image file sizes. It runs entirely in your browser with no data sent to any server.
What is the difference between DPI and PPI?
DPI (dots per inch) refers to print resolution and measures how many ink dots a printer places per inch. PPI (pixels per inch) refers to screen resolution and measures the pixel density of a digital display.
How do I calculate print size from pixels?
Divide the pixel dimensions by the desired DPI to get the print size in inches. For example, 3000 pixels at 300 DPI equals 10 inches. The Pixel Calculator handles this conversion automatically.
How does the file size estimation work?
The file size estimator calculates the uncompressed raw size based on pixel dimensions and color depth, then provides estimated sizes for BMP, PNG (approximately 40% compression), and JPEG (approximately 10% compression) formats.
Can I use the Pixel Calculator on my phone?
Yes, the Pixel Calculator is fully responsive and works on all devices including smartphones, tablets, and desktop computers. The layout adapts to smaller screens for comfortable use.