Area Calculator

Pick a shape, enter the dimensions, get the area.

Area formulas

Rectangle A = length × width Circle A = π × r² (circumference = 2πr) Triangle A = ½ × base × height Trapezoid A = ½ × (a + b) × h

Example: a 5 m × 4 m living room = 20 m². Flooring sold per m² at ¥150 would cost 20 × 150 = ¥3,000.