No one ever ruined a flooring job by measuring too carefully. Under-order by a box or two, though, and you’re the person driving back to the store mid-project, hoping the dye lot still matches. Five minutes with a tape measure is the cheapest insurance in any renovation — here’s how to get it right the first time.
Step-by-step: measure any room
- Clear the space. Move small furniture so you can reach every wall. You'll measure at floor level.
- Measure length and width. Hook your tape at one wall and read at the opposite wall. Write both numbers down immediately.
- Handle alcoves separately. Measure any nook or closet as its own small rectangle — don't try to eyeball it into the main room.
- Split L-shaped rooms. Divide irregular rooms into 2–3 simple rectangles, measure each, then add the areas.
- Measure twice. Re-measure every dimension once. A 2-inch error across a 20-ft room changes your material order.
Example calculation
Main area: 16 × 12 = 192 ft² · Alcove: 4 × 5 = 20 ft² · Total: 212 ft².
Add 10% waste for flooring → order for ≈ 233 ft².
Helpful reminders
- Use the same units for every dimension in one calculation.
- Measure in feet and inches, then convert — don't round early.
- Note door swings and fixed obstacles that affect flooring layout.
Got your numbers? The paint calculator and tile & flooring calculator turn measurements into a buy list — and the waste allowance guide tells you how much extra to order.
Frequently asked questions
Should I measure a room in feet or inches?
Use both — write feet and inches (12 ft 6 in) and leave the fractions alone while you work. Round only your final number: rounding each wall early is how a room ends up a box of flooring short.
How do I measure an L-shaped or oddly shaped room?
Sketch it on paper and split it into plain rectangles. Measure each rectangle’s length and width, work out each area, then add them up. Treat alcoves, closets and bay windows as their own small rectangles.
How much extra material should I add after measuring?
Measure dead-on, then add a waste allowance on top — usually 10% for flooring and paint, more for diagonal tile or fiddly rooms. Our waste allowance guide breaks down how much extra each material needs.