Category

Device Calculators

Device Calculators on DeviceHub cover the full form-based math suite for displays and print planning: PPI Calculator for screen pixels-per-inch from native resolution and diagonal (square-pixel geometry with accurate marketing diagonals); DPI Calculator for print dots-per-inch from image pixels and print inches, distinct from mouse DPI and from screen PPI; Screen Size Calculator for physical width and height from aspect plus diagonal, not manufacturer bezel quirks; Viewing Distance Calculator for seating rules of thumb that are not medical or ergonomic prescriptions; Aspect Ratio Calculator and Resolution Calculator for exact integer-pixel math with approximate “closest common” labels; and Refresh Rate Calculator for pure frame-time arithmetic, not a measured Hz test (use Refresh Rate Test for measurement). Permissions stay none across the suite, no camera. Cross-link Screen Information, Device Information, Display Aspect Ratio Test, and Refresh Rate Test when live browser or visual checks belong beside textbook math.

Start with PPI Calculator, Aspect Ratio Calculator, Screen Size Calculator, or DPI Calculator for everyday triage, then drill into Viewing Distance Calculator, Resolution Calculator, or Refresh Rate Calculator when a symptom needs a sharper lens. Capture the exact inputs beside every screenshot, and label results as calculator arithmetic, not factory lab certificates.