Area Calculator
Calculate area for 11 shapes: square, rectangle, parallelogram, triangle, trapezoid, rhombus, kite, ellipse, sector, regular polygon, and circle.
Calculate area
Answer
Area = 40
- Area = length * width = 8 * 5 = 40
How to use the area calculator
Pick a shape and the area calculator shows the matching formula with your values substituted in. It covers the common school geometry shapes from squares to regular polygons.
- Choose a shape.
- Enter the required measurements.
- Read the area and formula substitution.
Formula or method
Square s^2; rectangle l*w; parallelogram b*h; triangle b*h/2; trapezoid (a+b)/2*h; rhombus/kite p*q/2; ellipse pi*a*b; sector (angle/360)*pi*r^2; regular polygon n*s^2/(4 tan(pi/n)); circle pi*r^2.
Worked examples
Trapezoid area
Problem: bases 6 and 10, height 4
Solution: Area = (6 + 10)/2 * 4 = 32.
Regular hexagon area
Problem: 6 sides, side length 4
Solution: Area = 6 * 4^2 / (4 * tan(pi/6)) ≈ 41.57.