Copperplate Calligraphy Guide Sheets
Traditional Copperplate Calligraphy grids work off a 2:3:2 ratio with a 55 degree slant from the horizontal baseline.
Below you can download the ready-to-print PDF sized for an A4 page.
The download comes as a set of 3, including:
Small Grid (4mm baseline)
Medium Grid (5mm baseline)
Large Grid (6mm baseline)