How to Measure a Room for Flooring

Accurate flooring measurements prevent costly mistakes — running out mid-install or buying too much. Here's how to measure any room shape correctly and calculate how many boxes to buy.

Step-by-step measuring guide

Step 1: Gather your tools

Tape measure (25 ft works for most rooms)
Pencil and paper (or phone notes)
Optional: laser distance measurer for large rooms

Step 2: Sketch the floor plan

Draw a rough outline of the room — closets, alcoves, and irregular shapes included.

Step 3: Measure length and width

Measure at the widest and longest points of the room
Measure at floor level (not at countertop height)
Record in feet and inches (e.g., “12 ft 4 in”)

Step 4: Convert to decimal feet

Divide inches by 12: 12 ft 4 in = 12 + (4/12) = 12.33 ft

Step 5: Calculate area

Area = Length × Width

Step 6: Measure irregularities separately

For L-shapes, closets, and alcoves: measure each section and add all areas together.

Step 7: Add waste factor

Total with waste = Area × 1.10 (for 10% waste)

Common room measurement examples

Room	Measurement	Area	With 10% waste
Bedroom 10×12	10 × 12	120 sq ft	132 sq ft
Living room 14×16	14 × 16	224 sq ft	246 sq ft
Kitchen 10×14	10 × 14	140 sq ft	154 sq ft
Hallway 3×20	3 × 20	60 sq ft	66 sq ft

Boxes per square footage

Flooring boxes list the coverage on the label. Divide your adjusted area by that number:

Box coverage	For 100 sq ft	For 200 sq ft	For 300 sq ft
15 sq ft/box	7 boxes	14 boxes	20 boxes
20 sq ft/box	5 boxes	10 boxes	15 boxes
22 sq ft/box	5 boxes	10 boxes	14 boxes
25 sq ft/box	4 boxes	8 boxes	12 boxes
30 sq ft/box	4 boxes	7 boxes	10 boxes

Always buy from the same dye lot — colors can vary between production runs.

What to measure for different flooring types

Flooring type	Measure	Waste to add
Hardwood (straight)	Floor area	10%
Hardwood (diagonal)	Floor area	15%
Laminate / LVP	Floor area	10%
Tile	Floor area	10–15%
Carpet	Floor area (in sq yd)	10%
Sheet vinyl	Widest L × widest W	Minimal

Frequently Asked Questions

How do I measure a room for flooring?

Measure the longest length and widest width of the room in feet. Multiply them to get the square footage. Add 10% for waste and cuts. For L-shaped rooms, measure each rectangle separately and add them together.

Should I measure to the wall or to the baseboard?

Measure to the wall (not the baseboard face). Flooring goes under or up to the baseboard, which will be covered by new or reinstalled trim. Always measure the full floor area.

How much extra flooring should I buy for waste?

Buy 10% extra for straight or running bond installations. Add 15% for diagonal patterns. Buy 15% extra for rooms with many angles or cutouts. Always buy from the same dye lot.

Do I need to include closets in my flooring measurement?

Yes — always include closets, alcoves, and any other areas that will receive the same flooring. Measure them separately and add to the total room square footage.

How do I measure for flooring in an L-shaped room?

Divide the L-shape into two rectangles. Measure each rectangle separately (L×W for each), calculate both areas, then add them together. Add 10–15% waste to the total.