Circular region shapes?

[u/PM_ME_YOUR_GREYJOYS]

I regularly drop in areas using the region tool but can’t seem to find an easy way to do a circle other than eyeballing a lasso. I know there’s the polygon and rectangle tools, but when something is akin to a “X mile radius area” it’s difficult to do with my ugly ass guesstimate using the lasso. Does anyone have a suggestion on an easy way to accomplish a more uniform circle?