Mouse DPI Calculator

This tool computes monitor DPI (PPI) from pixel dimensions and the physical diagonal size. It targets designers, gamers, hardware testers, and QA engineers who need accurate display density metrics for asset scaling, cursor sensitivity setup, and device comparisons. Users input width_px, height_px, and diagonal_inches, with validation to ensure positive numbers. The calculator returns a precise DPI and a concise input summary to support reproducibility.
Conceptually, DPI is the ratio of the display's pixel diagonal to its physical diagonal. The core formula is PPI = sqrt(width_px^2 + height_px^2) / diagonal_inches. If a diagonal_cm is provided, the tool converts it to inches by dividing by 2.54. The approach is math-based and does not apply OS scaling or device-specific adjustments, ensuring a pure density metric.
Value and differentiators: it offers consistent rounding options, clear error handling for invalid inputs, and easy cross-device comparisons. Example: 2560x1440 on a 27 inch display yields approximately 109.87 PPI. This supports accurate asset sizing, reliable sensitivity tuning, and documentation-quality results for product teams, design studios, and QA departments. The tool emphasizes accuracy, transparency, and domain-aligned outputs.