# Room - Interior Surface Area (Walls, Ceiling and Floor)

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KurtHeckman.Room - Interior Surface Area (Walls, Ceiling and Floor)
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The Surface Area of a Room calculator computes the surface area of the interior of a rectangular room including the walls, ceiling and floor based on the length, width and height of the room. The Frame of a Room

INSTRUCTIONS: Choose units and enter the following:

• (L) The length of the room
• (W) The width of the room
• (H) The height of the room

Total Surface Area (A): The calculator will return the total surface area (A).  The area is returned in square feet.  However, this can be automatically converted to other area units (e.g. square meters) via the pull-down menu.

#### The Math / Science

The surface area of the interior of a room including the walls and ceiling is the sum of the area of the walls and the area of the ceiling.  These areas can be determined by the dimensions of the room.  The total area is the sum of:

1. The area of two walls, where Area = L*H
2. The area of two walls, where Area = W*H
3. The area of the ceiling, where Area = L*W
4. The area of the floor, where Area = L*W (the same as the ceiling)

For the total surface area of the interior of a room including walls, ceiling and floor, use the following equation:

A = 2*(L*H) + 2*(W*H) + 2*(L*W)

To compute the area of the interior of the room without the floor in the following equation:

#### Related Calculators

• To compute the area of the interior of the room without the floor
• To compute the number of gallons to paint or primer a room, CLICK HERE.
• To compute the cost to paint or prime a room, CLICK HERE.