Thermal Energy Calculator

Our thermal energy calculator is a useful tool for determining ideal gas parameters like average velocity, average kinetic energy, and total thermal energy. Just click on the calculate button by giving some inputs that give you instant results.

Thermal Energy Calculator: The kinetic molecular theory, which describes a gas as a large number of constantly moving atoms or molecules, can explain the behavior of gasses. These particles have the potential to collide with one another and the container's walls.

Continue reading to learn more about the definition of thermal energy definition and the equation, in the text below. 

What is Thermal Energy?

Thermal energy is the internal kinetic energy created by molecules moving randomly. The Maxwell-Boltzmann distribution can be used to explain the velocity of each molecule (which varies after collisions).

More information is available in our particle velocity calculator, which also allows you to calculate the average velocity of particles at a given temperature. The sum of all the particles' kinetic energies gives the overall thermal energy of a gas.

It's important to understand that equating thermal energy with heat is incorrect. Heat is a form of energy transfer, similar to work. To address the question of what thermal energy is, we can state that it is a system's internal property.

Thermal Energy Equation

In an ideal gas, what's the connection between temperature and kinetic energy? Our thermal energy calculator can calculate the average kinetic energy, average velocity, and total thermal energy of a gas. The following formulas are used:

<KE> = f * k * T / 2

<v> = √(2 * <KE> * Na / M)

U = n * Na * <KE>


<KE> = average kinetic energy of molecules,

<v> = average velocity of molecules,

U = total thermal energy of a gas,

f = number of degrees of freedom,

T = temperature,

M = molar mass of the gas,

n = number of moles,

k = Boltzmann constant k = 1.38064852 * 10^(-23) J/K,

Na = Avogadro constant Na = 6.022140857 * 10^

The number of degrees of freedom is a physical parameter used to describe a physical system's state. We assumed that equalled 3 in our thermal energy calculator, which is correct for a monatomic gas. Go to advanced mode if you want to change anything.

How Do I Calculate Thermal Energy?

Step 1: Determine the mass

Determine the object's mass, which is usually expressed in kilograms.

Step 2: Determine the specific heat

Find out the specific heat of the object.

Step 3: Determine the change in temperature

Over a certain time period, calculate the absolute change in temperature of the object.

Step 4: Calculate the thermal energy

Calculate the thermal energy using the formula above.

If you would like to learn more about the other physics calculator tools those tools are available at

FAQs on Online Thermal Energy Calculator

1. What is the definition of thermal energy?

Thermal energy is a measurement of an object's intrinsic energy stored in the movement of its particles.

2. How do you define total thermal energy?

The sum of all kinetic and potential energy in a physical system is referred to as thermal energy. A system's total internal energy is also known as its total thermal energy.

3. What are the three different kinds of thermal energy?

Three types of thermal energy transfer are Conduction, radiation, and convection. Only fluids experience convection, which is a cyclical process.

4. Is fire considered thermal energy?

When chemical relationships are destroyed and new ones are formed during a combustion reaction, then thermal energy (heat) is generated. Fuel and oxygen are converted into carbon dioxide and water during combustion.