Front tires wearing on outer edge

Do you have a carpenters square? 1/4" difference between the top and bottom of the rim on a 14" or 15" rim is about 1degree of camber. Does your tire sit with the top out or in? You can sight down the side of the car using the rear wheels to compare the front to also to see if they have positive camber. Why not take a tape measure to the tires to check toe?