Drag the corners of the grid to at least a 24x16 inch rectangle on your mat. The grid should be as large as possible but does not need to cover the entire mat.

Use a measuring tape to measure the width and height of the grid on your mat. Input these measurements into the width and height fields.

If the projected lines are straight but don’t align with your mat, your width or height might be off by 1 inch/centimeter. Double-check your measurements with a measuring tape. Mat measurements can be confusing or inaccurate, so checking with a measuring tape is important.

If the projected lines look curved, your mat or surface below the mat may not be flat. Try to flatten the mat but putting card stock under the low points or move to a different cutting surface.

If the projected grid looks like rectangles instead of squares, the width and height may be swapped. Simply swap the values in the fields.