Enter the temperature (K), the Boltzman’s constant (1.38 * 10^-23), and the charge (coulombs) into the calculator to determine the Thermal Voltage.

## Thermal Voltage Formula

The following formula is used to calculate the Thermal Voltage.

Vth = k * T / q
• Where Vth is the Thermal Voltage (volts)
• T is the temperature (K)
• k is the Boltzman’s constant (1.38 * 10^-23)
• q is the charge (coulombs)

To calculate the thermal voltage, multiply the temperature by Boltzman’s constant, then divide by the charge.

## How to Calculate Thermal Voltage?

The following example problems outline how to calculate Thermal Voltage.

Example Problem #1

1. First, determine the temperature (K). In this example, the temperature (K) is determined to be 14 .
2. Next, determine the Boltzman’s constant (1.38 * 10^-23)..
3. Next, determine the charge (coulombs). In this case, the charge (coulombs) is found to be 7.
4. Finally, calculate the Thermal Voltage using the formula above:

Vth = k * T / q

Inserting the values from above and solving the equation yields:

Vth = 14 * 1.38*10^-23 / 7 = 2.76e-23 (volts)

Example Problem #2

Using the same method as above, determine the variables required by the equation. For this example problem, these are:

temperature (K) = 9

Boltzman’s constant (1.38 * 10^-23)

charge (coulombs) = 2

Enter these given values into the calculator or above yields:

Vth = 9 * 1.38*10^-23/ 2 = 6.21e-23 (volts)