# Heating Per Unit Mass

**URL:** https://openmc.discourse.group/t/heating-per-unit-mass/2089
**Category:** User Support
**Created:** [May 31, 2022, 11:32pm UTC](https://openmc.discourse.group/t/heating-per-unit-mass/2089 "2022-05-31T23:32:29Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![kevinm387](https://avatars.discourse-cdn.com/v4/letter/k/bcef8e/32.png) [@kevinm387](https://openmc.discourse.group/u/kevinm387)
#### Post date: [May 31, 2022, 11:32pm UTC](https://openmc.discourse.group/t/heating-per-unit-mass/2089/1 "2022-05-31T23:32:29Z")

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Hi All,

Is there any way to get heating tallies in units of eV/g, similar to MCNP’s F6 tally? Of course, I can just divide tally output by the mass of the material, but sometimes I have mesh voxels that include multiple cells and materials, which complicated things a bit. So I’m just wondering if there’s a way to natively tally in energy units per mass unit.

Thanks!

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### Author: ![paulromano](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/paulromano/32/486_2.png) [@paulromano](https://openmc.discourse.group/u/paulromano)
#### Post date: [June 1, 2022, 11:52am UTC](https://openmc.discourse.group/t/heating-per-unit-mass/2089/2 "2022-06-01T11:52:51Z")

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Hi @kevinm387. At present, we don’t have an automated way to give heating tallies in eV/g as you suggest, so you’ll have to manually divide by the mass in the region of interest.