Room Square Footage Calculator
Measure the square footage of any room — bedrooms, living rooms, kitchens, bathrooms, or oddly-shaped spaces. Enter dimensions in feet and inches and see results in real time.
Room Calculator
How to measure a room
For a standard rectangular room, measure the length wall-to-wall along one side, then measure the width wall-to-wall along an adjacent side. Multiply the two together to get square footage.
For accuracy, measure each dimension at two points — once near the front of the room and once near the back. Older homes especially can taper by an inch or more across a single wall, which adds up over a full project.
Always measure to the inside of the wall surface (the finished wall), not to the studs. For flooring projects, measure to where you want the flooring to end — usually under the threshold of any doorway.
Step-by-step measurement guide
Clear the perimeter
Move furniture away from the walls so your tape measure can run flush. Even a couple of inches of obstruction can throw off your reading.
Measure the length
Hook your tape on one wall, run it straight to the opposite wall. Note the measurement in feet and inches.
Measure the width
Repeat perpendicular to the length. Take the measurement at the widest point if the walls aren't perfectly parallel.
Multiply
Length × Width = Square Footage. Or just type your numbers into the calculator above and skip the math.
Add a waste factor
If you're ordering material, add 5–15% on top depending on the project type. The calculator does this for you when you select a material.
Pro tips
Measure feet AND inches
Don't round 12 ft 7 in down to 12 ft. Even small rounding errors add up across a whole room.
Sketch as you go
Draw the room shape and label each wall's measurement directly on the sketch. You'll catch mistakes faster.
Closets count for flooring
If you're buying flooring, include closets and any small alcoves — they need flooring too.
Subtract immovable obstacles
Built-ins, fireplaces, and floor-to-ceiling cabinets reduce the floorable area. Measure and subtract them.