I have been searching for an online calculator that can give me accurate results, I recently found a web site that has a nice R value calculator; you can check it out at this address - http://www.reflective-foil-insulation.com/thermal_analysis.php?application=residential
You can calculate all kinds of insulation products and applications, there is also lots of info about R value and U value.
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The R-value of insulating material is an indication of its effectiveness in reducing heat flow through walls, floor, and ceiling of a structure.
Every insulation has a different R value. It ultimately is determined by which insulation you will be using. Now lets do rough estimate. 4" thick, regular fiberglass mat has R-value of 13. Assuming that plywood has the same to half the insulating value of fiberglass, 1/2" plywood would have 1/8 to 1/16 of R-value of that 4" mat. Roughly R-1.6 to R-0.8
it is a good thing i think R Value is the thermal resistance of a given material. The higher the R Value the more thermal resistance and the better the insulation. So, an R48 roof system is warmer than an R32 roof system. All insulation materials are rated by their R Value. An inch of rigid insulation has a higher R Value than an inch of fiberglass insulation. Check with the insulation manufacturer for the R Value.
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If you know the circumference, You can figure this out:First, calculate the radius. Do this by rearranging the formula c = 2πr to r = c / 2πNow you should know the radius. Use this value to calculate the area using the formula A = π r^2