# Using tabulated potentials in gromacs

**URL:** <https://gromacs.bioexcel.eu/t/using-tabulated-potentials-in-gromacs/1753>\
**Category:** User discussions\
**Tags:** forcefield\
**Created:** [March 15, 2021, 3:13pm UTC](https://gromacs.bioexcel.eu/t/using-tabulated-potentials-in-gromacs/1753 "2021-03-15T15:13:22Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![megamence](https://avatars.discourse-cdn.com/v4/letter/m/5e9695/32.png) [@megamence](https://gromacs.bioexcel.eu/u/megamence)\
**Post date:** [March 16, 2021, 12:59pm UTC](https://gromacs.bioexcel.eu/t/using-tabulated-potentials-in-gromacs/1753/3 "2021-03-16T12:59:46Z")

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@alevilla thank you for your response! So that is exactly what I have done. What I am wondering about is, what should my value of k (Boltzmann’s constant) be? Plugging in 1.38e-23 seems incorrect. How do the units work? For example, in the 6-9 LJ fluid, they simply plug in 1/r^9 in the C12 column. 1/r^9 has units of 1/(nm)^9, but the units of C12 is 4epsilon_sigma^12 has units of kJ/mol_(nm)^12

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