What is the formula for NTC Thermistor Temperature Calculator?

Core formula: R = R25·e^{B(1/T − 1/T25)} ｜ 1/T = 1/T25 + ln(R/R25)/B. The tool returns results instantly using this formula and the selected parameters.

NTC Thermistor Temperature Calculator

Favorite

Two-way B-equation conversion between temperature and resistance, plus reverse calculation from a pull-up + ADC reading, with sensitivity and ADC resolution.

Key points

NTC Thermistor Temperature Calculator: Two-way B-equation conversion between temperature and resistance, plus reverse calculation from a pull-up + ADC reading, with sensitivity and ADC resolution. Formula: R = R25·e^{B(1/T − 1/T25)} ｜ 1/T = 1/T25 + ln(R/R25)/B. Enter parameters on the DD-CAT IDE online tool page to get results instantly, with a calculation-model diagram that updates with the inputs. The single-point B model is good to about ±1°C over 0–100°C; use the three-coefficient Steinhart-Hart model or a lookup table for precision work. Choosing a pull-up of 1/3 to 1× R25 puts the working temperature range on the steepest part of the divider curve.

Inputs

R = R25·e^{B(1/T − 1/T25)} ｜ 1/T = 1/T25 + ln(R/R25)/B

Calculation model (updates with parameters)

Temperature	25.00 ℃
NTC resistance	10 kΩ
Divider voltage Vout	1.6500 V	NTC 在下、10.00kΩ 上拉
12-bit ADC code	2048
Sensitivity	-4.44 %/℃	Negative means resistance falls as temperature rises
Temperature per ADC code	0.022 ℃/LSB	Approximately the smallest resolvable temperature step
Resistance ratio R/R25	1.0000

Engineering notes

The single-point B model is good to about ±1°C over 0–100°C; use the three-coefficient Steinhart-Hart model or a lookup table for precision work.
Choosing a pull-up of 1/3 to 1× R25 puts the working temperature range on the steepest part of the divider curve.

FAQ

What is NTC Thermistor Temperature Calculator for?: Two-way B-equation conversion between temperature and resistance, plus reverse calculation from a pull-up + ADC reading, with sensitivity and ADC resolution.
What is the formula for NTC Thermistor Temperature Calculator?: Core formula: R = R25·e^{B(1/T − 1/T25)} ｜ 1/T = 1/T25 + ln(R/R25)/B. The tool returns results instantly using this formula and the selected parameters.
What engineering notes should I keep in mind when using NTC Thermistor Temperature Calculator?: The single-point B model is good to about ±1°C over 0–100°C; use the three-coefficient Steinhart-Hart model or a lookup table for precision work. Choosing a pull-up of 1/3 to 1× R25 puts the working temperature range on the steepest part of the divider curve.