It is important to have an accurate estimation of room size so it can be assessed whether the training can be undertaken effectively and safely. PLEASE NOTE: If you do not have a room of suitable size it may be necessary to run the training at an alternative location such as a community centre, church hall or local hotel or to limit the number of delegates. TO CALCULATE ROOM SIZE in SQUARE METRES - length of room in metres x width of room in metres = area (size) of room in square meters.