- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
-
Circular Sector Area, Arc Length and Chord Length CalculatorCompute a circular sector's area, arc length and chord length from radius and central angle (degrees or radians). Free, exact geometry calculator.
-
Circle Area and Circumference CalculatorCalculate the area and circumference of a circle from its radius or diameter. Uses S = pi r squared and L = 2 pi r with high precision.
-
Pizza Size CalculatorCompare two pizza sizes by area. See how much more food a larger pizza gives and which size is the better deal — diameter to area in seconds.
-
Annulus (Ring) CalculatorCalculate the area and perimeter of an annulus (ring) from its outer and inner radii using Area = π(R² − r²) and circumference 2π(R + r).
-
Circle Perimeter CalculatorEnter a circle's radius in cm, m, in, or ft to instantly get its perimeter (circumference) using P = 2πr. Fast, accurate, and classroom-ready.
-
Circle Area CalculatorCalculate the area of a circle quickly and accurately with this Circle Area Calculator. Simply input the radius to determine the precise area of any circular shape.
