Evenly Spaced Horizontal Placement
First, we’ll find the horizontal placement for these pieces, by subtracting the total width of all three paintings (20″ + 20″ + 20″ = 60″) from the total width of the wall (100″ – 60″ = 40″). Now we divide that 40″ by 4, to give us an interval between the paintings of 10″. This means that from the edge of the wall to the paintings is a space of 10″ and between each painting is also a space of 10″. to simplify this as a formula, we might write it as such:
(Width of wall – Combined Width of all paintings) / (No. of total paintings + 1) = Interval Distance
Using the dimensions above, the formula would look like this:
(100″ – [20"+20"+20"] ) / (3 + 1) = 10″
Calculate Spacing Between Frames
For best results center the frames 60 inches (152 cm) from the ground.
Check out How to Hang a Show by Anthony Sell