📐 Geometry🌍 Metric & Imperial🎓 GCSE / SAT / IB
Area Calculator
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.
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.