Calculates RTD resistance from the Callendar-Van Dusen equation: R(T) = R₀(1 + AT + BT² − CT³(T−100)) for −200 to 850 °C. Pt100 (R₀ = 100 Ω at 0 °C) changes by ~0.385 Ω/°C — accuracy class B: ±0.3 °C at 0 °C; class A: ±0.15 °C.
Inputs
R0 Ohm
Opposition to current flow (Ω). V = IR. Resistors in series add; in parallel their reciprocals add.
T C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
A Coeff
Reference formula or conversion factor shown for context.
B Coeff
Reference formula or conversion factor shown for context.
Results
RTD resistance R(T) (Ω)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
sensitivity dR/dT (Ω/°C)
Sample size or count used in the calculation.
temperature coefficient α (°C⁻¹)
The value at the specified point or condition.
Callendar-Van Dusen: R(T) = R₀(1+AT+BT²)
The value at the specified point or condition.
PT100 reference
Sample size or count used in the calculation.
accuracy class
The fraction of predictions or measurements that are correct. High accuracy is only meaningful when the class distribution is balanced.