NTC Thermistor Calculators ( XIXITRONICS )

Calculate B-value or Temperature using Steinhart-Hart Equation

B-Value Calculator

Resistance at T1 (Ω):

Temperature T1 (°C):

Resistance at T2 (Ω):

Temperature T2 (°C):

B-value will appear here

Steinhart-Hart Calculator

Measured Resistance (Ω):

Coefficient A:

Coefficient B:

Coefficient C:

Temperature will appear here

About NTC Thermistors

NTC (Negative Temperature Coefficient) thermistors are temperature sensors whose resistance decreases as temperature increases.

B-Value Formula

The B-value characterizes the relationship between resistance and temperature:

B = [ln(R₁/R₂)] / [(1/T₁) - (1/T₂)]

Where temperatures must be in Kelvin (K = °C + 273.15)

Steinhart-Hart Equation

A more accurate model for converting resistance to temperature:

1/T = A + B·ln(R) + C·[ln(R)]³

Where T is in Kelvin, R is resistance in ohms, and A, B, C are coefficients specific to the thermistor.

The B-value method uses a simplified model that assumes a constant B-value across the temperature range. The Steinhart-Hart equation provides higher accuracy by using three coefficients that account for non-linear behavior.

Tools