Sketch convert pixels to inches

Sketch measures everything in pixel units, so we need a way to convert our design to the physical world of inches. 72 pixels in Sketch converts to 1 inch in an exported PDF. An 8.5″ × 11″ piece of paper (US Letter) converts to a 612px × 792px artboard A typical 3.5″ × 2″ business card converts to a 252px × 144px artboard