Flooring Calculator
Work out how much flooring to buy across one or several rooms. Pick your installation pattern (straight, diagonal or herringbone) for the right waste factor, and get the total square footage and the number of boxes to order.
132 ft² (7 boxes)
7 boxes at 20 ft²/box
Before waste: 120 ft² across 1 room. Overage: 12 ft² for cuts and pattern matching.
Waste presets: straight lay 5–10%, diagonal/chevron 12–18%, herringbone up to 17%. Confirm your product's exact box coverage on the packaging. How we calculate →
How much flooring do I need?
Add up the length × width of every room you're covering (in feet), then apply a waste factor for cuts, trimming and pattern matching. For a 200 ft² room with a straight-lay pattern and a 10% waste factor, order 200 × 1.10 = 220 ft² — the calculator does this per room and sums the total.
Add each room as its own row above; hallways and closets count too. The total, not the per-room figures, is what determines how many boxes to buy.
How much waste should you add per installation pattern?
The pattern you choose drives how much extra material you'll cut away and discard. Straight lay (planks running one direction) typically needs 5–10% extra — offcuts can often be reused at the next wall. Diagonal layouts (45°) need more, usually 12–18%, because every perimeter piece is cut at an angle and the triangular offcut can't be reused as a straight plank. Herringbone or chevron patterns can run up to 17% or more due to the double-angle cuts at every joint.
How many boxes of flooring do I need?
Divide the total area (with waste already added) by the coverage per box, printed on the product packaging — commonly 18–24 ft² for laminate or LVP. Always round up to a whole box, since suppliers won't split a box: for 220 ft² needed at 20 ft²/box, that's 11 boxes, not 10.9.
Ordering for multiple rooms
If several rooms use the same flooring, add them all as separate rows and let the calculator total the area before applying waste and rounding to boxes — that avoids buying a partial box per room and wasting material on a job with several small spaces.
Frequently asked questions
How much waste factor should I use for flooring?
5–10% for a straight-lay pattern, 12–18% for diagonal (45°) layouts, and up to 17% or more for herringbone/chevron. The calculator pre-fills a sensible default when you pick a pattern, but you can override it for a room with lots of corners or obstacles.
How do I calculate how many boxes of flooring to buy?
Total the room area, add your waste factor, then divide by the box's coverage (from the packaging) and round up. For a 200 ft² room with 10% straight-lay waste and 20 ft²/box, that's 220 ÷ 20 = 11 boxes.
Does diagonal flooring use more material than straight lay?
Yes — diagonal patterns typically need 12–18% extra material versus 5–10% for straight lay, because every plank meeting the wall at 45° produces a triangular offcut that can't be reused. For a 200 ft² room that's roughly 230 ft² needed (12 boxes at 20 ft²/box) versus 220 ft² (11 boxes) for straight lay.
How much flooring do I need for multiple rooms?
Add each room's length × width as a separate entry; the calculator sums the total area before applying waste and rounding to full boxes, so you buy exactly enough for the combined job rather than a partial box per room.
What's a typical box coverage for laminate or vinyl plank flooring?
Most laminate and LVP boxes cover 18–24 ft², though it varies by brand and plank size — always use the exact figure printed on your product's packaging, which is what the 'coverage per box' field above is for.
Researched & verified by the Calcuris Data & Research Team. How we build and check our tools →