Under-ordering tile means a delayed project waiting on a matching batch that may not even be in stock anymore, which is why builders always order a bit more than the exact room measurement. This calculator takes your room dimensions and chosen tile size, adds a waste allowance to cover cuts and breakage, and tells you exactly how many tiles — and how many full boxes — you need to buy. It works for bathroom floors, kitchen backsplashes, or any tiled surface where getting the quantity right the first time saves you an extra trip to the store and reduces the risk of a discontinued batch mismatch halfway through the job.