Choose the actual shape
Rectangle, square, circle, triangle and trapezoid formulas are different. Selecting the correct shape is more important than squeezing every project into length × width.
Shape & land area calculator
Area Calculator
Calculate the area of common shapes and see the result in multiple units. Use rectangle, square, circle, triangle or trapezoid mode for rooms, plots, paving and general measurement work.
Interactive tool
Area Calculator
Planning estimate only. Verify measurements, material specifications, densities, package coverage and supplier pricing before ordering.
Visual guide
How the Area Calculator Works
See the measurement path before using the formula. The visual separates area, depth, volume and purchase units so the calculation is easier to verify.
Practical guide
What to Know Before You Calculate
The number is only useful when the inputs describe the actual project. These are the assumptions that most often change the result.
Keep dimensions in one unit
The calculator accepts feet, yards or metres and normalizes the result before showing square feet, square yards, square metres and acres.
For complex plots
Split the site into simple shapes and add the results, or use the irregular-shape calculator with coordinate points when the boundary cannot be represented cleanly by simple figures.
Calculation guide
How to Use the Area Calculator
Choose the shape, enter the required dimensions in one length unit, and the calculator applies the matching geometry formula. Results are converted to square feet, square yards, square metres and acres.
Core formulaArea depends on shape: rectangle L×W; circle πr²; triangle ½bh; trapezoid ½(a+b)h
Choose the shape
Select rectangle, square, circle, triangle or trapezoid.
Enter required dimensions
Use one consistent length unit.
Apply the matching formula
The calculator uses the formula for the selected geometry.
Read converted area
Results are shown in ft², yd², m² and acres.
Worked example
Area Calculator Example
A 12 ft × 20 ft rectangle has an area of 240 ft². That equals about 26.67 yd² or 22.30 m².
Reference values
Area Calculator Reference Table
Use this table for quick planning checks. Calculator inputs remain the better choice when your dimensions, depth, density, waste or product coverage differ.
| Square Side | Square Feet | Square Yards |
|---|---|---|
| 1 ft × 1 ft | 1 ft² | 0.11 yd² |
| 11 ft × 11 ft | 121 ft² | 13.44 yd² |
| 21 ft × 21 ft | 441 ft² | 49.00 yd² |
| 31 ft × 31 ft | 961 ft² | 106.78 yd² |
| 41 ft × 41 ft | 1,681 ft² | 186.78 yd² |
| 51 ft × 51 ft | 2,601 ft² | 289.00 yd² |
| 61 ft × 61 ft | 3,721 ft² | 413.44 yd² |
| 71 ft × 71 ft | 5,041 ft² | 560.11 yd² |
| 81 ft × 81 ft | 6,561 ft² | 729.00 yd² |
| 91 ft × 91 ft | 8,281 ft² | 920.11 yd² |
People also ask
Area Calculator FAQs
Overlapping questions are consolidated so each answer covers a distinct calculation or planning issue.
How can I calculate area?
Use the formula for the shape you are measuring. For a rectangle, multiply length by width. For circles and triangles, use the corresponding radius or base-and-height formula.
What is a formula for area?
There is no single formula for every shape. Rectangle area is length × width; circle area is π × radius²; triangle area is ½ × base × height.
How to calculate total area in sq ft?
Calculate each section in feet, convert each section to square feet, then add the section areas together.
Can I calculate land area on Google Maps?
Mapping tools can estimate land area from mapped boundaries, but boundary accuracy and legal property dimensions should be verified from appropriate survey or property records.
How do I calculate the area of a figure?
Identify the shape or divide an irregular figure into shapes with known formulas, calculate each part, and add or subtract the pieces as needed.
Methodology & source note
Formulas are shown on the page and variable assumptions are exposed as inputs where they affect the result. Unit relationships are checked against NIST measurement references. Material density, packaging, product coverage and pricing should be verified with the supplier for the material actually being purchased.