How to Measure Your Room for Flooring — Step-by-Step Guide

Gather your tools

You need a steel tape measure (25 ft minimum for large rooms), a pencil, paper (or phone for photos of measurements), and a calculator. A laser distance meter is a worthwhile investment for large projects — it lets you take accurate measurements solo and stores readings.

Tip: A laser measure is $30–$60 at any hardware store and pays for itself on a single flooring project.

Measure the longest dimension first

Measure the length of the room at its longest point, measured from wall to wall. If the room has any jogs, alcoves, or bay windows, note these separately — you'll add or subtract them later. Write the measurement in feet and inches (e.g., 14 ft 7 in), then convert to decimal feet (14 ft 7 in = 14.58 ft).

Tip: Measure at floor level — walls can lean, and measuring at 3 feet off the floor may give a slightly different reading.

Measure the width

Measure the width perpendicular to your length measurement, again at the widest point. For irregular rooms (L-shapes, rooms with jogs), sketch the room on paper and divide it into simple rectangles — measure each rectangle separately.

Tip: For bay windows that will receive flooring, measure their square footage separately and add to the main room area.

Calculate base square footage

Multiply length × width (in decimal feet) to get base square footage. For irregular rooms, add the square footage of each rectangle together. Example: main room 14.5 ft × 12.0 ft = 174 sf; plus a 5 ft × 4 ft alcove = 20 sf; total = 194 sf.

Add waste allowance

Flooring always requires waste allowance for cuts, especially at walls, doorways, and obstacles. Standard allowances: 10% for straight-set parallel installation; 15% for diagonal installation; 15–20% for herringbone or complex patterns; 10% minimum for tile. Multiply your base sf by the appropriate factor.

Tip: If you're finishing a room with many small jogs, bays, or closets, use 12–15% even for straight-set installation.

Account for closets and thresholds

Include all closet floor area in your measurement — flooring typically runs into closets unless they already have a different floor type. Measure each closet separately and add to the total. Door thresholds and transitions do not consume significant floor area but note them for the installer.

Convert to boxes

Divide your total square footage (after waste) by the coverage per box (shown on the product label — typically 15–25 sf per box). Round up to the nearest whole box. Example: 214 sf needed ÷ 19.08 sf/box = 11.2 boxes → order 12 boxes.

Tip: Always check multiple boxes at purchase for dye lot consistency — stacking planks from different lots in the same room can show a visible colour variation.