> For the complete documentation index, see [llms.txt](https://tk233.gitbook.io/notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tk233.gitbook.io/notes/motor-control/ntc-temperature-sense-resistor-value-calculation.md).
# NTC Temperature Sense Resistor Value Calculation
NTC resistance follows the formula
Take the 10k [NCP18XH103F03RB](https://www.murata.com/en-eu/api/pdfdownloadapi?cate=\&partno=NCP18XH103F03RB) as example:
`T_R` is 25℃, or 298.15 K
`R_R` is 10k at 25℃
`B` is 3380K
Thus, we get
```c
r_ntc = 1e5 * pow(3380. * (1. / temperature - 1. / 298.15));
```
or, to get temperature,
```c
temperature = 3380. / (log(r_ntc / 10000.) + 3380. / 298.15);
```
### Reference Manual
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