Not only the voxel map, but also the whole region of the map, for example the colume of the blue region in the following fig.

Best,

Tianming

发件人: Elaine Meng <meng@cgl.ucsf.edu>
日期: 星期三, 2022年9月21日 下午4:10
收件人: Tianming Qu <tqu@fsu.edu>
抄送: ChimeraX Users Help <chimerax-users@cgl.ucsf.edu>
主题: calculate volume of voxels

If you mean to just find out the voxel size, you can use command "volume settings" or menu: Tools... Volume Data... Map Coordinates.
<https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/tools/mapcoords.html__;!!PhOWcWs!xrqKohxNSCfckLcye7LYBV-K4etN0HWgVHJeRESO5aZvezJihBg0pif9bSakwcYHaNuT_Z6phcKbZw$  >

If you mean to measure the volume inside the surface (cubic angstroms) then command "measure volume" or menu: Tools... Volume Data... Measure Volume and Area.
<https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/tools/measurevolume.html__;!!PhOWcWs!xrqKohxNSCfckLcye7LYBV-K4etN0HWgVHJeRESO5aZvezJihBg0pif9bSakwcYHaNuT_Z7XwPi_sA$  >
<https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/commands/measure.html*volume__;Iw!!PhOWcWs!xrqKohxNSCfckLcye7LYBV-K4etN0HWgVHJeRESO5aZvezJihBg0pif9bSakwcYHaNuT_Z5EkUG-aQ$  >

See also the general page on measurements:
<https://urldefense.com/v3/__https://rbvi.ucsf.edu/chimerax/docs/user/measurements.html__;!!PhOWcWs!xrqKohxNSCfckLcye7LYBV-K4etN0HWgVHJeRESO5aZvezJihBg0pif9bSakwcYHaNuT_Z4tIITbew$  >

Elaine
-----
Elaine C. Meng, Ph.D.                      
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On Sep 21, 2022, at 12:18 PM, Tianming Qu via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:
>
> Thanks for the so quick reply Dr. Elaine.
> 
> One more question, can chimera calculate the volume of voxels for density map?
> 
> Best,
> Tianming