How to Measure a Room for Flooring
The biggest estimating mistake in flooring is eyeballing the square footage. Closets, stairs and transitions still cost time and material — and they are exactly what gets forgotten.
Break the room into rectangles
Few rooms are perfect rectangles. Split an L-shaped or irregular room into simple rectangles, measure each (length × width), and add them up. Measure at the widest points and to the back of every doorway and closet.
Don’t forget the extras
Closets, alcoves, stair treads and transitions all take flooring and all get skipped. Stairs in particular use more material than their footprint suggests. Enter each area into the flooring calculator so nothing is left off the count.
Add waste last
Once you have the true square footage, add the waste factor for cuts and pattern — 5–10% straight, more for diagonal or herringbone. That final number is what you order, and what you price.
FAQ
How do I measure a room for flooring?
Multiply length by width for each rectangle, split irregular rooms into rectangles, add closets, doorways and stairs, then add 5–10% waste.
Do I include closets and doorways?
Yes — closets, alcoves and the floor into each doorway all take material and are commonly forgotten.
How do I measure stairs for flooring?
Measure each tread and riser; stairs use more material than their floor footprint, so count them separately.