If you’re an architect or construction manager tasked with calculating the R-Value of building materials, you may appreciate this useful tool from Universal Foam Products. Our online calculator helps you to calculate the R-Value of different densities and thicknesses of EPS insulation at different ambient temperatures. You can also be confident that the R-Value of EPS will stay constant and will not change overtime. EPS insulation sheets don’t “settle” over time like some other insulation materials.