Enter the thickness (in) and the R-value into the Calculator. The calculator will evaluate the Insulation K Value. 

Insulation K Value Formula

K  = T / R

Variables:

  • K is the Insulation K Value ((BTU-in/hr-ft^2-F))
  • T is the thickness (in)
  • R is the R-value

To calculate Insulation K Value, divide the thickness by the r-value of the material.

How to Calculate Insulation K Value?

The following steps outline how to calculate the Insulation K Value.


  1. First, determine the thickness (in). 
  2. Next, determine the R-value. 
  3. Next, gather the formula from above = K = T / R.
  4. Finally, calculate the Insulation K Value.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

thickness (in) = 30

R-value = 2.5

FAQs about Insulation K Value

What is R-value in insulation?

R-value is a measure of thermal resistance used in the building and construction industry. It indicates how well a material can resist heat flow. The higher the R-value, the better the material is at insulating.

Why is the K value important in insulation?

The K value, or thermal conductivity, measures how easily heat passes through a material. It’s important in insulation because it helps determine the efficiency of the insulation material. Lower K values mean better insulation properties.

Can I calculate the K value for any type of insulation material?

Yes, as long as you have the material’s thickness and R-value, you can calculate the K value using the formula K = T / R. This calculation can apply to various insulation materials.

How can improving insulation K value benefit a building?

Improving the K value of a building’s insulation can significantly reduce energy costs by minimizing heat loss or gain. It also enhances comfort levels within the building and contributes to a more environmentally friendly structure by reducing the need for heating and cooling.