Drag the corner of the outline to fit a real bank or credit card (85.6 mm wide)
– PPI
How many pixels fit along one physical inch of the screen.
How to use this PPI tool
• Drag the corner until the outline matches a bank/credit card (85.6 mm wide).
• The PPI number updates live; click Copy PPI to save it for specs or design tools.
• Why it matters: knowing true pixels-per-inch lets you size UI elements to real-world mm/inches and compare screens fairly.
• Tip: this calibration works even if your browser zoom isn’t 100%, because you match a real object.