Rooms, structures, vehicles, and other objects can be accurately diagrammed, often without performing a physical on-site inspection. Photographs of a room, structure, vehicle, or other object are uploaded to a computer having a processor. A base calibration measure is determined for a room, structure, vehicle, object, or component thereof, depicted in the photographs using at least one known dimension for items observable in the photographs. The base calibration measure is then used to determine dimensions of other areas, items, or objects depicted in such photographs, and to create at least one scale diagram of the subject matter of the photographs. Damages areas of the structure/vehicle/object can be assessed from the scale diagram. The scale diagram can then be used to calculate appropriate insurance payment amounts for damage claims.