Paint Calculator is super feature that gives clear understanding for amount of paint  requires for painting project.  In nearest future we can calculate labour cost for the painting project. Usually for 3 bedroom unit/house required amount of paint for ceilings is 20L  in most cases its flat (bathroom ceilings best to use Mould proof paint or simple low sheen paint, 30 litres of paint  for walls usually its low sheen, and 4-6 Litres for wood work.if its new surfaces you must apply sealer/primer undercoat.

Coverage in most cases around 1L per 10 Square meters Again its for previously painted surfaces only. For new plaster board its around 8 squares per 1 L, and new render is 5-7 square meters per one litre of paint.