> R-Value Wall Area Calculator

To get best benefit from this calculator you need to do the following:

1. Work out the dimensions and R-Value for the wall construction itself.
2. Then if required work out the dimensions and R-Value for the inset (usually a window) in the wall
3. Enter the total wall dimensions and R-Value into the calculator above, then enter the dimensions and R-Value for the inset
4. Note the total R-Value and the energy loss figures.

Remember, the values calculated here should be taken as a rough guide, it does not take into account other effects (like draughts and heat or cooling sources) in the room.

Reset & do another calculation.

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