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Room Surface Area (walls and ceiling)

`A = 2 * L * H + 2 * W * H + L * W `
`(L)"Length of Room"`
`(W)"Width of Room"`
`(H)"Height of Room"`

The Room Surface Area calculator computes the surface area of the interior of a rectangular room including the walls and ceiling based on the length, width and height of the room. /attachments/15fce39f-addd-11e3-9cd9-bc764e2038f2/ceiling - Paint.png

INSTRUCTIONS: Choose units and enter the following:

  • (L) Length of Room
  • (W) Width of Room
  • (H) Height of Room

Room Surface Area (A): The calculator will return the total surface area (A) of the interior room including the walls and ceiling 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

This totals to compute the area of the interior of the room in the following equation:

     A = 2(L•H) + 2(W•H) + L•W

where:

Note: The above does not include the area of the floor.   

Drywall Pricing

Pricing for drywall is an estimate.  The pricing per sheet used in this estimator is as follows:

Room Calculators

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  • Drywall Materials for a Room: Computes the number of drywall boards (4x8 or 4x12), number of drywall nails or screws and gallons of joint compound need for a room based on the room's dimensions.
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  • Cost of Flooring a Room: Computes the square feet of a room and then applies the price per square feet of different flooring products (e.g., hardwood, carpeting, tile)
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  • Outlets and Wiring for Room: Computes the number of outlets (boxes) and length of wire to connect them in a room based on the room dimensions and the outlet spacing.
  • Total Surface Area of a Room: 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.

Building Calculators