Enter the sum of the area of all elements (m^2), the heat capacity (J//kg-K), and the total floor area (m^2) into the Thermal Mass Calculator. The calculator will evaluate and display the Thermal Mass. 

Thermal Mass Formula

The following formula is used to calculate the Thermal Mass. 

TM = AE * HC / TFA

  • Where TM is the Thermal Mass (J/m^2-K)
  • AE is the sum of the area of all elements (m^2) 
  • HC is the heat capacity (J//kg-K) 
  • TFA is the total floor area (m^2) 

How to Calculate Thermal Mass?

The following example problems outline how to calculate Thermal Mass.

Example Problem #1

  1. First, determine the sum of the area of all elements (m^2).
    • The sum of the area of all elements (m^2) is calculated to be : 30.
  2. Next, determine the heat capacity (J//kg-K). 
    • The heat capacity (J//kg-K) is measured to be: 10.
  3. Next, determine the total floor area (m^2). 
    • The total floor area (m^2) is found to be: 50.
  4. Finally, calculate the Thermal Mass using the formula above: 

TM = AE * HC / TFA

The values given above are inserted into the equation below and the solution is calculated:

TM = 30 * 10 / 50 = 6 (J/m^2-K)


Example Problem #2

The variables needed for this problem are provided below:

sum of the area of all elements (m^2) = 76

heat capacity (J//kg-K) = 85

total floor area (m^2) = 134

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer. 

TM = AE * HC / TFA = (J/m^2-K)