Things You'll Need
Instructions
Purchase a standard dry erase board, preferably at least 20 x 20 inches in size. It is always better to have as large a board as possible because this gives you more options for drawing dungeons of varying sizes.
Mark off every inch along each edge of the dry erase board with a ruler. Measure very carefully to ensure that your lines will be straight after you draw them. Dividing the board into 1-inch squares is a typical method as the miniature figures tend to be based on 1-inch scales. If you are using custom figures or markers, you can make slightly larger or smaller squares.
Draw straight horizontal lines across the board from edge to edge with a permanent marker, and then draw straight vertical lines until your board is a grid. Use a yard stick or thin piece of cardboard as a straight edge to guide your marker as you draw. Using an ultra-fine-tipped marker is best so that your dry erase marker lines are clearly distinguishable against the permanent grid lines.
Draw a dungeon map on the grid with a dry erase marker, using the permanent lines as a guide for creating a neat floor plan. When you are finished with the map you have drawn, you can simply erase it and draw a new one without causing any damage to the grid underneath.