Flooring Calculator

Enter room length and width to calculate how many boxes of flooring you need.

The formula

Multiply room length by width to get the floor area, add a waste percentage for cuts, divide by the coverage printed on the box, and round up to a whole box. A 12 x 14 room is 168 sq ft; laid straight that is 168 x 1.08 = 181.4 sq ft of material, which at 23.6 sq ft per box means 8 boxes of LVP.

Why layout pattern changes the answer

Every cut plank has an offcut, and how many offcuts you can reuse depends on the layout. A straight layout parallel to the longest wall wastes about 8%. Running planks diagonally pushes waste to about 12% because every row starts and ends with an angled cut. Herringbone and other patterns waste 18% or more. Most online calculators use a flat 10% regardless of layout, which under-orders patterned installs.

Box coverage varies by brand

There is no standard box size. LVP commonly ships around 23.6 sq ft per box, laminate around 20, engineered hardwood around 22, and tile around 12.5, but plank width and length change the number from one product line to the next. The calculator pre-fills a typical value when you pick a material; overwrite it with the coverage printed on the box you are actually buying before you order.

Order everything at once, and keep a spare box

Flooring color shifts between production runs, so order the full quantity in one purchase from the same dye lot. Rounding up to whole boxes usually leaves some material over; keep an unopened box as attic stock so a future repair matches the original floor.

Rooms that are not rectangles

L-shaped rooms, bump-outs, and angled walls all change the true floor area. Break the room into rectangles and sum them with our floor plan square footage calculator, or use the irregular shape area calculator for odd shapes. If you have a floor plan PDF, MeasureFloorPlan can trace every room on it and give you a box count per room, including drywall, paint, and trim quantities for a whole-plan material takeoff.

How do I calculate how many boxes of flooring I need?

Multiply the room length by the width to get the floor area in square feet, add a waste percentage for cuts (8% for a straight layout, 12% diagonal, 18% herringbone), then divide by the coverage printed on the flooring box and round up to a whole box. Example: a 12 x 12 room laid straight needs 144 x 1.08 = 156 sq ft, which is 7 boxes at 23.6 sq ft per box.

How much extra flooring should I buy for waste?

Plan on 8% extra for a standard straight layout, 12% for a diagonal layout, and 18% for herringbone or other patterned layouts. Rooms with many jogs, closets, or angled walls sit at the high end. The waste covers end cuts, mistakes, and damaged planks.

How many square feet does a box of flooring cover?

Typical coverage is about 23.6 sq ft per box for LVP, 20 sq ft for laminate, 22 sq ft for engineered hardwood, and 12.5 sq ft for tile. Coverage varies by brand and plank size, so always use the number printed on the box you are actually buying.

Should I round up when buying flooring?

Yes. Flooring is sold in whole boxes, so always round up. It is also worth keeping one unopened box as attic stock for future repairs, and ordering everything from the same dye lot so the color matches across boxes.