How do you convert you value to r value?

To convert U vals To R Vals 1/u = r val

As in pie r squared? r = radius.

R value is a measure of the ability of a material to retard, or slow down, the movement of heat.

The R value or R-value, the measure of thermal resistance (K·m²/W) used in the building and construction industry

The R value or R-value, the measure of thermal resistance (K·m²/W) used in the building and construction industry