Enter the resistances at initial and final temperatures, and the initial and final temperatures into the calculator to determine the RTD coefficient.

Rtd Coefficient Formula

The following formula is used to calculate the RTD coefficient.

RTD = (R2 - R1) / (T2 - T1)


  • RTD is the Resistance Temperature Detector coefficient (Ω/°C)
  • R1 is the resistance at temperature T1 (Ω)
  • R2 is the resistance at temperature T2 (Ω)
  • T1 is the initial temperature (°C)
  • T2 is the final temperature (°C)

To calculate the RTD coefficient, subtract the resistance at the initial temperature from the resistance at the final temperature. Then, subtract the initial temperature from the final temperature. Divide the first result by the second result to get the RTD coefficient. This will give you the change in resistance per degree Celsius.

What is an Rtd Coefficient?

An RTD coefficient, also known as the temperature coefficient of resistance, is a measure of how much the electrical resistance of a material changes with a change in temperature. It is typically expressed in terms of percentage change per degree Celsius. This coefficient is particularly important in the design and use of resistance temperature detectors (RTDs), which are sensors used to measure temperature by correlating the resistance of the RTD element with temperature.

How to Calculate Rtd Coefficient?

The following steps outline how to calculate the RTD Coefficient.

  1. First, determine the resistance at temperature T1 (R1) in ohms (Ω).
  2. Next, determine the resistance at temperature T2 (R2) in ohms (Ω).
  3. Next, determine the initial temperature (T1) in degrees Celsius (°C).
  4. Next, determine the final temperature (T2) in degrees Celsius (°C).
  5. Next, use the formula RTD = (R2 – R1) / (T2 – T1) to calculate the RTD Coefficient in ohms per degree Celsius (Ω/°C).
  6. Finally, insert the values of R1, R2, T1, and T2 into the formula and calculate the RTD Coefficient.

Example Problem:

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

R1 = 50 Ω

R2 = 100 Ω

T1 = 25 °C

T2 = 75 °C