How this calculator works
1. Floor area
Each room is a rectangle. Split L-shaped or irregular spaces into rectangles, and add closets you plan to floor as separate sections.
2. Waste and boxes
Waste covers end cuts, pattern alignment, defective pieces and a few spare boards for future repairs. The suggested allowance starts at 10% for standard layouts and rises for diagonal (+5%) and herringbone or chevron (+10%) patterns, because angled cuts produce more offcuts. These are common rules of thumb; your installer or the product’s instructions may recommend a different amount.
3. Cost
Material is priced on the full boxes you actually buy, not the fractional amount you need. Labor is priced on the net floor area, which is how installers typically quote.
Frequently asked questions
How much extra flooring should I buy?
For a simple straight layout in a rectangular room, around 10% is a widely used starting point. Rooms with many corners, angled walls, or a diagonal or herringbone pattern need more. Our guide to measuring a room for flooring walks through it.
Why does the cost per square foot come out higher than the price tag?
The all-in figure includes waste, rounding up to whole boxes, underlayment, tax and labor. That is the number to compare when you get quotes. The flooring cost breakdown guide explains each line.
Does this work for carpet and sheet vinyl?
Yes, as an area estimate. Both are cut from rolls of fixed width, so real waste depends on how seams fall. Ask your supplier to plan the cuts before you order.