Insulation for a Room

`NR = f(L,W,H,RL)`

Enter a value for all fields

The Rolls of Insulation for a Room calculator computes the number of rolls of insulation needed for the WALLS and CEILING of a room based on the length and height of the four walls. The calculator assumes standard 16" spacing on the studs and rafters.

INSTRUCTIONS: Choose units and enter the following:

(L) Length of Room
(W) Width of Room
(H) Height of Room
(RL) Insulation Roll Length

Insulation Rolls for a Room (NR): The calculator returns number of rolls of insulation (rounded up) and the total linear feet of insulation.

The Math/Science

Insulation is unrolled and placed between the studs in a room with the foil covering of the insulation facing the side where you want the heat to stay. If you are insulating to keep out the cold and the heat in, the foil faces the inside of the room. If you are keeping heat out and the room cool, you face the foil outward. Computing the number of studs in a room is done by computing the number of studs needed in the four walls. Each wall has the first stud (1) plus the number of studs needed for spacing (16"). Similar math is calculated for rafters.

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