- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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Area from Circumference CalculatorFind the area of a circle from its circumference using A = C² / (4π). Also returns radius and diameter instantly. Free online geometry calculator.
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Circle Moment of Inertia (Area) CalculatorCalculate the area moment of inertia of a solid circle from its radius or diameter using I = πr⁴/4 = πd⁴/64. Free engineering tool.
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Partially Filled Circle Area CalculatorCalculate the filled cross-section area and fill percentage of a partially filled circle or cylindrical tank from radius and fill depth.
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Radius from Area of a Circle CalculatorFind the radius of a circle from its area using r = √(A/π). Instantly get radius, diameter, and circumference for any circle area.
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Circumference of a Circle CalculatorCalculate the circumference of a circle from radius or diameter using C = 2πr = πd. Get circumference, diameter, and area instantly with worked examples.
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Circle to Cylinder Volume CalculatorTurn a circle's radius and a height into a cylinder volume instantly with V = πr²h. Free calculator showing circle area and total cubic volume.
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Circumference to Area CalculatorConvert a circle's circumference to its area instantly with A = C²/(4π). Also shows radius and diameter. Free, accurate geometry calculator.
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Diameter from Radius CalculatorFind a circle's diameter from its radius instantly using d = 2r. Also returns circumference and area. Fast, free, and accurate geometry tool.
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Radius from Circumference CalculatorFind a circle's radius from its circumference using r = C / (2π). Also returns diameter and area instantly. Free, accurate geometry calculator.
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Circumference from Radius CalculatorCalculate the circumference of a circle from its radius using C = 2πr. Instantly get circumference, diameter, and area from any radius value.
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Area from Radius CalculatorCalculate the area of a circle from its radius using A = πr². Also returns diameter and circumference instantly. Free, accurate circle area tool.
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Degrees-Minutes-Seconds to Decimal Degrees CalculatorConvert latitude/longitude in degrees, minutes and seconds (DMS) to decimal degrees instantly using decimal = D + M/60 + S/3600.
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Belt Length Around Two Pulleys CalculatorCalculate the approximate length of an open belt around two pulleys from their diameters and center distance using the standard belt-length formula.
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Circle Degrees to Arc Length CalculatorConvert a circle's central angle in degrees and radius into arc length. Free calculator with the L = (θ/360) × 2πr formula, radians, and circumference.
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Wheel Revolutions to Distance CalculatorConvert wheel revolutions into distance travelled. Enter wheel diameter and number of turns to get distance in meters, km, miles, and feet.
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Circular Motion Speed CalculatorConvert RPM and radius into linear (tangential) speed and angular velocity. Uses v = 2πr·(RPM/60) = ωr for any rotating object.
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Circle to Sphere Surface Area CalculatorCalculate the surface area of a sphere from its radius using SA = 4πr². Also returns diameter and volume. Fast, free, and accurate geometry tool.
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Circle to Sphere Volume CalculatorCalculate the volume of a sphere from its radius using V = (4/3)πr³. Also returns diameter and surface area instantly with full precision.
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Arc Length from Radius and Radians CalculatorCalculate arc length from a circle's radius and central angle in radians using s = r × θ. Free, instant, with chord length too.
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Centripetal Acceleration CalculatorCalculate centripetal acceleration and angular velocity from tangential velocity and radius using a = v²/r and ω = v/r. Free physics tool.
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RPM to Angular Velocity CalculatorConvert RPM to angular velocity in radians per second instantly. Uses ω = RPM × 2π / 60, with degrees/second and Hz outputs too.
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Circumference to Diameter CalculatorConvert a circle's circumference to its diameter instantly with d = C / π. Free online calculator that also gives the radius. Works with any unit.
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Circle Through Three Points CalculatorFind the equation of a circle passing through three points. Get center (h,k), radius, area, and circumference instantly with full step-by-step formula.
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Circle Inscribed in a Square CalculatorFind the radius, diameter, area and circumference of the largest circle inscribed in a square. Enter the side length and get instant results.
