Area is two-dimensional
If dimensions are in meters, the result is square meters (m²). Feet produce ft², and so on.
Geometry
Area Calculator
Choose a square, rectangle, triangle or circle, enter its dimensions and get the area with the formula shown. Use meters, centimeters, feet or inches; the answer is in square units.
Area
96 m²Rectangle area = length × width.Calculate surface area for everyday projects
Use area calculations for flooring, paint coverage, gardens, fabric, construction materials, and school geometry problems.
Common area formulas
Square: side². Rectangle: length × width. Triangle: base × perpendicular height ÷ 2. Circle: π × radius², or π × diameter² ÷ 4. Use measurements in the same linear unit to obtain square units.
Choose radius or diameter
Select the measurement you have. A circle with diameter 10 has radius 5; both inputs give the same area, approximately 78.539816 square units.
Try an area calculation
A 12 ft × 8 ft room is 96 ft²
Multiply length by width. This is the floor area, before allowing for cutting waste.
Calculate this room →A square with 5 m sides is 25 m²
Multiply the side length by itself: 5 × 5 = 25.
Calculate this square →Base 12 cm and height 8 cm give 48 cm²
Use the perpendicular height, rather than a sloping side: 12 × 8 ÷ 2 = 48.
Calculate this triangle →Area calculator questions
Does changing the unit convert my measurements?
No. The unit selector labels your input dimensions and the answer. Enter every dimension in the same unit. To convert an existing area, use the area unit converter.
How do I calculate square footage?
Select the shape, set the unit to feet and enter dimensions measured in feet. A rectangle 12 feet long and 8 feet wide has an area of 96 square feet.
Can I calculate a circle from its diameter?
Yes. Select Circle, choose Diameter and enter the diameter. The calculator divides it by 2 to obtain the radius before applying πr².
What if my room is L-shaped?
Divide it into non-overlapping rectangles, calculate each area, then add the results. Subtract any openings or areas that do not need covering.
Does this calculate the surface area of a 3D object?
No. It calculates the area of flat shapes. Surface area of a cylinder, sphere or other solid requires different formulas.