In other countries where the X over 12 makes less sense due to the metric system, degrees of pitch can be used. This is almost simpler on one hand. But building it in the field requires a different skill set or tool. A high schooler might immediately understand a 30° pitch roof better than 7/12.
For your convenience here is a simple chart showing the comparison of roof pitches to angles:
Or you can use this handy calculator.
Istockhouseplans strives to make the best use of your materials. If you would like us to analyze your plan and convert roof pitches to the most economical use of your lumber, please contact us.