I’ve used the tool, and it’s okay for rough estimates but not perfectly accurate. It usually assumes standard ceiling heights, basic prep, and mid-range paint, so rooms with higher ceilings, lots of windows/doors, or extra prep work will cost more. In my experience, the
Cost to paint a room USA tool gave numbers about 10–20% lower than what painters actually charged. For more precise estimates, tools like HomeAdvisor or Angie’s List calculators let you include factors like paint quality and prep work, which makes the final estimate closer to reality.