Free Area Calculator 2026 to calculate the area of rectangles, circles, triangles and polygons in meters, feet or inches. Fast and accurate area calculation tool.
Different shapes use different formulas to calculate area. Here are the formulas used by our calculator:
Rectangle: Area = Length × Width
Circle: Area = π × Radius² (where π ≈ 3.14159)
Triangle: Area = (Base × Height) / 2
To calculate rectangle area, multiply the length by the width. For example, a room that is 10 feet long and 12 feet wide has an area of 120 square feet (10 × 12 = 120). Our calculator does this automatically when you enter your dimensions.
Circle area is calculated using the formula: Area = π × radius². Enter your circle's radius, and our calculator will multiply it by itself and then by π (3.14159) to give you the area in square units.
Triangle area is calculated by multiplying the base by the height and dividing by 2. Formula: Area = (base × height) / 2. This works for any triangle when you know the base and perpendicular height.
Yes! Use the 'Feet/Inches' or 'Meters/Centimeters' toggle button at the top of the calculator to switch between Imperial and Metric units. Your results will be displayed in the corresponding square units (sq ft or sq m).
Calculate the room's area using our rectangle calculator, then add 5-10% extra for cuts and waste. For tile or hardwood, add 10-15% extra to account for pattern matching and mistakes.
Yes! The calculator automatically saves your last 5 calculations in the 'Calculation History' section below the calculator. History entries older than 3 days are automatically deleted. You can manually clear history anytime using the 'Clear History' button.
For irregular shapes, break them into regular shapes (rectangles, triangles, circles), calculate each area separately using our calculator, then add them together for the total area.
Area measures the space inside a shape in square units (like sq ft or sq m). Perimeter measures the distance around the outside of a shape in linear units (like ft or m). This calculator computes area only.