Measure rooms, floors, walls and other spaces in seconds. Choose your area shape, enter the measurements and get instant square footage with useful unit conversions.
Measure your space, multiply its dimensions, and find its area in three simple steps.
Use a tape measure to measure one side of your room or rectangular space.
Measure the adjoining side. Use the same unit for both measurements.
Multiply the two measurements. If both are in feet, your answer is in square feet.
Irregular room? Divide it into rectangles, calculate each area, and add the results together.
Length × Width = Area
12 ft × 10 ft = 120 sq ft
Check these example room dimensions and their square footage at a glance.
100 sq ft
120 sq ft
144 sq ft
180 sq ft
300 sq ft
400 sq ft
500 sq ft
1,000 sq ft
Areas are calculated using length × width for square and rectangular spaces. Planning to carpet your room? Use the carpet calculator to include a cutting allowance and compare area and roll estimates.
Turn your area measurements into useful information for home improvements and everyday planning.
Use the flooring calculator to include waste, package coverage and material pricing. For individual tile counts and whole-box quantities, enter your tile dimensions in the tile calculator.
Find the surface you plan to cover with the wall area calculator, subtracting doors and windows where needed. For paint quantities, use the paint calculator with your product’s coverage and planned coats.
Plan the coverage needed for paving, turf or garden beds before comparing suppliers and material options.
Compare room sizes when planning furniture layouts, workspaces or how to use an available area.
Use these conversion factors when your measurements and project requirements use different area units.
Express the same space in the unit your project needs.
All values above represent 1 square foot. The ≈ symbol indicates a rounded conversion. For more unit conversion factors, see the NIST unit conversion guidance.
Clear answers to common questions before you measure your space or plan your project.
Each measurement field accepts one unit at a time. For a measurement such as 12 feet 6 inches, enter 12.5 with feet selected, or 150 with inches selected.
Yes. Each dimension has its own unit selector. For example, you can enter length in feet and width in meters. The calculator converts both measurements into a common unit before calculating the area.
When using L-Shape or Multiple Areas, make sure the sections you enter do not overlap. Each part of the space should be included only once, otherwise the total will be too large.
Square footage describes surface area. To estimate concrete, soil or mulch volume, you also need the intended depth. Use a volume calculator with area and depth measurements for those quantities.
Enter the most accurate measurements you have, including decimals. Round the final result when needed rather than rounding every dimension first. For material orders, follow the supplier’s guidance on pack sizes and waste allowances.
The calculator provides a geometric area estimate based on your inputs. Official property measurements may follow specific rules about which spaces to include. For a U.S. appraisal example, see Fannie Mae’s property measurement guidance. Check the requirements that apply to your property and use a qualified professional when a certified measurement is needed.
Have your measurements handy? Get your area and unit conversions in a few clicks.