What is the formula for the area of a triangle?

Area of a triangle = ½ × base × height. The height must be perpendicular to the base. Example: base 10m, height 6m → area = ½ × 10 × 6 = 30 m².

How do I convert m² to ft²?

1 m² = 10.7639 ft². Multiply square metres by 10.7639 to get square feet. Example: 5 m² = 53.82 ft².

Why do some countries use m² and others use ft²?

The US, Liberia, and Myanmar primarily use imperial units (ft², in²). All other countries officially use the metric system (m², cm²). In the UK, real estate often uses ft² alongside m², while most scientific and engineering contexts use m².

📐 Geometry🌍 Metric & Imperial🎓 GCSE / SAT / IB

Area Calculator

Q: How do you calculate the area of a circle?

The area of a circle = π × r², where r is the radius. If you know the diameter, r = d/2. Example: radius 5 cm → area = π × 25 = 78.54 cm².

Calculate the area of any shape. Select your shape, enter dimensions, and get results in metric and imperial units.

QUICK ANSWER

Area formulas: Circle = πr² · Rectangle = w×h · Triangle = ½×b×h · Trapezoid = ½(a+b)×h · Ellipse = πab. Convert: 1 m² = 10.764 ft².

Shape

Unit

Radius (m)

A = π × r²

Area Units by Country

Country / Region	Common Unit	Real Estate	Land Area
🇺🇸 USA	sq ft (ft²)	sq ft	acres
🇬🇧 UK	Mostly m²	sq ft / m²	acres / hectares
🇨🇦 Canada	m² / sq ft	sq ft (common)	acres
🇦🇺 Australia	m²	m²	hectares
🇩🇪 Germany	m²	m²	Hektar (ha)
🇯🇵 Japan	m²	Tatami (畳) / m²	tsubo (坪) / m²
🇮🇳 India	m² / sq ft	sq ft (popular)	bigha / acre
🇫🇷 France	m²	m²	hectares

Frequently Asked Questions

How do you calculate the area of a circle?

Area = π × r². With r = 5 cm: area = π × 25 ≈ 78.54 cm². If you only know the diameter, use r = d/2 first.

What is the formula for the area of a trapezoid?

Area = ½ × (a + b) × h, where a and b are the two parallel sides and h is the perpendicular height.

How do m² and ft² compare?

1 m² = 10.7639 ft². A typical living room of 20 m² ≈ 215 ft². US real estate listings use ft²; EU/AU/JP typically use m².

What is a tatami unit (Japan)?

In Japan, room sizes are traditionally measured in tatami mats (畳). One tatami ≈ 1.65 m² (Kyoto size) or 1.62 m² (standard). A 6-tatami room ≈ 9.7 m².

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Cite this page APA · MLA · BibTeX

APA

WorldCalculators.org. (2026, September 25). Area Calculator — Circle, Rectangle, Triangle, All Shapes. https://worldcalculators.org/calculators/area/

MLA

“Area Calculator — Circle, Rectangle, Triangle, All Shapes.” WorldCalculators.org, 25 Sept. 2026, worldcalculators.org/calculators/area/.

BibTeX

@misc{worldcalculators2026calculatorsarea,
  title        = {Area Calculator — Circle, Rectangle, Triangle, All Shapes},
  author       = {{WorldCalculators.org}},
  year         = {2026},
  howpublished = {\url{https://worldcalculators.org/calculators/area/}}
}

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