Not all rooms are square, but to calculate the area of a room with uneven sides, it simply has to treated as if it was. The simple calculation can be applied to floors, walls or ceilingsany plane with an angled side. Or it can just be used to calculate the area of drawings or any surface. We will use a room as an example below.
Things You'll Need
 Tape measure
 Calculator

Measure the width of the room. Record this measurement as dimension "A."

Measure the shortest of the two different wall lengths. Record this measurement as dimension "B."

Measure the longest of the two walls and record this measurement as dimension "C."

Calculate the area of the room by the following formula:
dimension A x dimension B= area segment "1"
(dimension C  dimension B) x dimension A = area segment "2"
area segment 2 ÷ 2 = area segment 3
area segments 1 + 3 = Square footage of room
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