ROI-Unit of measurment

Hi,
Does anyone know what is the unit of measurement of the area of selected ROI. I want to convert the current unit of measurement to mm² .

Thanks in advance.

Hi
@HODAYA

Use:->Analyze->Set Scale
Mathew

Thank you so much!
Do you know if there is a way to find out what is the resolution (ppi) of the images? I need it in order to convert from pixels to cm.

Thanks again.

Hi @HODAYA
I do not understand what you want.
If you want to scale your image then:
http://microscopy.berkeley.edu/courses/dib/sections/04IPIII/IJsetscale.html
(You’ll find easy tutorials on youtube too)
if not:
Consult this document:
https://imagej.nih.gov/ij/docs/guide/index.html
See the paragraph: 28-11
I hope that helps.