What is the difference between area and perimeter?

Area measures the space inside a shape (square units). Perimeter measures the distance around it (linear units).

How do I calculate the area of an irregular shape?

Break it into regular shapes (rectangles, triangles, circles), calculate each area separately, and sum them.

Can I calculate square footage for flooring?

Yes. Select Rectangle, enter dimensions in feet using imperial mode. For L‑shaped rooms, calculate sections separately and add.

What is Heron's formula?

Calculates triangle area from three sides: s = (a+b+c)/2, then Area = √[s(s−a)(s−b)(s−c)].

Professional Area Calculator – All 2D Shapes

Mastering Area Calculations: Complete Guide

Area quantifies the size of a two‑dimensional surface. Whether you're laying flooring, painting a wall, or designing a garden, knowing how to compute area is essential. This Professional Area Calculator supports 12 common 2D shapes, provides results in both metric and imperial units, and shows the underlying formula for complete transparency.

Area Formulas by Shape

Circle: A = π·r²
Rectangle / Square: A = length × width (square: side²)
Triangle: A = ½·base·height. With three sides, use Heron's formula.
Trapezoid: A = ½·(base₁ + base₂)·height
Parallelogram: A = base × height
Ellipse: A = π·a·b (a, b are semi‑axes)
Rhombus (diagonals): A = ½·d₁·d₂
Circle Sector: A = (θ/360°)·π·r²
Annulus (Ring): A = π·(R² − r²)
Regular Polygon: A = (n·s²) / (4·tan(π/n))

💡 Example: Rectangle 5m × 3m

Area = 5 × 3 = 15 m². In imperial, that's approximately 161.5 ft².

Unit Conversions

The calculator displays the area in the selected base unit (m² or ft²) and also provides common conversions. For metric: cm², ft², hectares, acres. For imperial: in², m², yd², acres. These are useful for real‑estate, landscaping, and international projects.

Frequently Asked Questions

How do I calculate area of an L‑shaped room?

Divide it into two rectangles, compute each area, and add them. Use the rectangle mode twice.

What is the difference between square meters and meters squared?

They are the same: m² means square meters, a unit of area. 1 m² is a square 1 m on each side.

Can I use this for land area?

Yes. For rectangular plots, use rectangle mode. Results are shown in acres and hectares. For irregular shapes, you'll need a different tool.

Why do I get an error with triangle sides?

The three sides must satisfy the triangle inequality: each side must be less than the sum of the other two.

Area Calculator

Area Results

Recent

Mastering Area Calculations: Complete Guide

Area Formulas by Shape

💡 Example: Rectangle 5m × 3m

Unit Conversions

Frequently Asked Questions

All Calculators

Area Calculator

Area Results

Recent

Mastering Area Calculations: Complete Guide

Area Formulas by Shape

💡 Example: Rectangle 5m × 3m

Unit Conversions

Frequently Asked Questions

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