NTC thermistor calculator
The Beta model drifts several degrees at the ends of a wide range, and divider self-heating biases the reading. Resistance to temperature in both directions with the Beta and Steinhart-Hart models, divider ADC counts and self-heating estimate.
Open the calculator in EM·LINKBelow is a worked example. The working calculator runs free in EM·LINK.
Worked example
Example inputs
Example result
Inside the −20 to +80 °C band where the Beta model holds well.
| Quantity | Value |
|---|---|
| Divider voltage | 0.657 V |
| NTC resistance | 2.485 kΩ |
| Temperature (Beta) | 60.0 °C |
| Sensitivity | 23 counts per °C |
| Power in the NTC | 0.17 mW |
| Self-heating at 1 mW/°C | 0.17 °C |
Self-heating uses a dissipation constant of 1 mW/°C. Enter your datasheet value.
Calculations run in your browser. Nothing is sent to us.
The working calculator is NTC Thermistor in EM·LINK, our free browser tool. The button opens it directly.
How to read the result
Use Beta near the reference point. Beyond roughly -20 to +80 C, switch to Steinhart-Hart.
Keep divider dissipation under 1 mW. A 10k NTC on 3.3 V adds about 0.3 C from self-heating.
How this is calculated
The ADC reading gives the divider voltage, the divider gives the NTC resistance, and the Beta or Steinhart-Hart model turns resistance into temperature.
The full derivation, step by step, is in the EM·LINK documentation.
Calculated per common engineering practice (the Beta model and the Steinhart-Hart equation). These tools are an engineering aid, not a certification.
Next step
Logging these sensors across the plant? Embedos Edge takes analog and digital I/O.
Common questions
Beta or Steinhart-Hart?
Beta is fine over a narrow range. Steinhart-Hart is accurate over wide ranges.
How do I get ADC counts from an NTC divider?
Enter the series resistor, reference voltage and ADC bits. The tool gives Vout and counts.
Does self-heating matter?
Yes for precision work. Keep dissipation low or pulse the excitation.
Related tools
- RTD PT100 and PT1000, when you need accuracy over a wide range.
- ADC resolution and noise, to check how much of the reading is noise.
- Thermocouple type K and J, for temperatures beyond what an NTC can survive.