Pick your Thermocouple Type, choose whether to calculate Temperature or Voltage, then enter your known value alongside the Ambient (Cold Junction) Temperature — the calculator returns your calculated result plus the Seebeck Coefficient, Temperature Range, and Voltage Range for your selected thermocouple.
Calculated Value
--
Seebeck Coefficient
--
Temperature Range
--
Voltage Range
--
Cold junction compensation accounts for the temperature at the reference junction where thermocouple wires connect to measurement equipment. Since thermocouple voltage depends on temperature difference, the cold junction temperature must be known for accurate measurements.
Type K is most common for general purpose (-200°C to 1260°C), Type J for industrial applications, Type T for low temperatures, Type E for high sensitivity, Type B for high temperatures, and Type N for improved stability over Type K.
The Seebeck coefficient (dV/dT) represents the thermocouple's sensitivity at a specific temperature, showing how much voltage changes per degree of temperature change. Higher values indicate greater sensitivity.
Thermocouples generate very small voltages, typically in the millivolt range. For example, a Type K thermocouple produces about 41 microvolts per degree Celsius, so measurements are expressed in millivolts for practical precision.
NIST thermocouple reference tables are highly accurate, typically within ±0.1°C for most thermocouple types. These tables are the international standard for thermocouple calibration and temperature conversion.
Yes, this calculator supports Celsius (°C), Fahrenheit (°F), and Kelvin (K) temperature units. The thermocouple voltage relationships remain consistent regardless of the temperature scale used for display.
Operating outside a thermocouple's specified temperature or voltage range can result in inaccurate readings, accelerated aging, or permanent damage. Always verify your application stays within the rated limits.