How many pcs is Windows 10Pro upgrade good for?

[Windows Central Question]

I work for a Church and we upgraded our pcs to Windows 10Home, but we now need Windows 10Pro on them. What we were wondering is, if we upgrade to Windows 10Pro, through this site, will it be good for only one pc or will it be able to cover all 3 of our pcs?

 

[ven07]

Not sure how many devices would be covered. In any case if you're going to pro then you will need to get a license key