This can be accomplished by setting a piece of hardwood on the subfloor next to each component and marking across the component with a pencil.
Trim out hardwood floor by doors.
If the door works properly measure the width of the opening and add the width of the casing.
The best approach is to trim away the molding called casing that surrounds the outside frame of the door.
Use a saw or multitool to cut the jambs trim and molding at the pencil marks.
Buy a good multi tool here.
Some designs have plinth blocks as shown below or the door trim extends straight and flush to the floor.
23 recommended how to install hardwood floors around doors upstairs hallway 1 installing hardwood floors.
Https amzn to 2poix33 assorted blade set.
That way hardwood planks can slip right underneath the casing to give the impression.
A base shoe shown the baseboard just has an eased.
Https amzn to 2tftgup here is the blade i use in the video.
See also restrained doors using general finishes java gel stain looks pretty.