- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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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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Diagonal of a Rectangle CalculatorFind the diagonal of a rectangle from its length and width. Also computes the diagonal angle, perimeter, and area instantly using the Pythagorean theorem.
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Distance from Point to Line CalculatorCalculate the perpendicular distance from a point (x₀, y₀) to a line ax + by + c = 0 using d = |ax₀+by₀+c|/√(a²+b²). Free and instant.
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Paint Area Calculator with Door & Window DeductionsCalculate the true paintable wall area by subtracting door and window openings from the gross wall area. Free, metric, and easy to use.
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Paint Calculator with Multiple CoatsCalculate how much paint you need for a wall with multiple coats. Enter width, height, coats, and coverage to get gallons or liters required.
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Scalene Triangle Perimeter CalculatorCalculate the perimeter of a scalene triangle by adding its three unequal sides: P = a + b + c. Fast, accurate, free online tool.
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Moles to Gas Volume at STP CalculatorConvert moles of any ideal gas to volume at STP. Uses the molar volume of 22.414 L/mol. Fast, accurate chemistry calculator with worked examples.
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Distance Between Two Points CalculatorFind the straight-line distance between two points (x1,y1) and (x2,y2) using the distance formula. Get distance, midpoint, and Δx/Δy instantly.
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Area of an Octagon CalculatorCalculate the area of a regular octagon from its side length using A = 2(1+√2)·s². Instant results with perimeter and worked example.
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Diagonal of a Square CalculatorCalculate the diagonal of a square from its side length using d = s√2. Also returns perimeter and area instantly. Free online geometry tool.
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Diagonal of a Rectangle CalculatorFind the diagonal of a rectangle from its length and width using d = √(l² + w²). Also shows perimeter and area instantly.
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Area of a Semicircle CalculatorCalculate the area of a semicircle from its radius using A = ½πr². Also shows diameter and perimeter. Fast, free, and accurate semicircle area tool.
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Area of an Ellipse CalculatorCalculate the area of an ellipse instantly using A = π·a·b. Enter the semi-major and semi-minor axes to get area plus an approximate perimeter.
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Area of a Sector CalculatorCalculate the area of a circular sector from radius and central angle in degrees or radians. Also gives arc length. Free, instant, with formula and examples.
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Distance, Midpoint & Slope CalculatorFind the distance, midpoint, and slope between two points (x₁,y₁) and (x₂,y₂) on the coordinate plane. Free, instant, step-friendly results.
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Area of a Pentagon CalculatorCalculate the area of a regular pentagon from its side length. Get area, perimeter and apothem instantly with the exact geometric formula.
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Surface Area of a Pyramid CalculatorCalculate the total surface area of a square pyramid from its base edge and slant height. Free, instant geometry tool with formula and worked example.
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Pavers Needed for a Rectangular Patio CalculatorCalculate how many pavers you need for a rectangular patio. Enter patio and paver dimensions plus waste to get the exact count, area, and overage.
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Decking Boards for a Rectangular Deck CalculatorCalculate how many decking boards you need for a rectangular deck based on deck size, board width, board length and the gap between boards.
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Bricks Needed for a Rectangular Wall CalculatorCalculate how many bricks you need for a rectangular wall from its length, height, brick face size and a waste allowance. Fast and free.
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Topsoil Volume for a Rectangular Bed CalculatorCalculate how much topsoil you need for a rectangular garden bed. Enter length, width and depth in metres to get the volume in cubic metres and cubic yards.
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Area of Isosceles Triangle from Base and Equal SidesCalculate the area, height, and perimeter of an isosceles triangle from its base and two equal sides using the exact geometric formula.
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Triangle Side from Two Sides & Included Angle (Law of Cosines)Find the third side of a triangle from two sides and the included angle using the Law of Cosines: c = √(a² + b² − 2ab·cosC). Free, instant.
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Sine, Cosine & Tangent of an Angle CalculatorCalculate sin(θ), cos(θ) and tan(θ) for any angle in degrees or radians. Instant trigonometric function values with a clear worked example.
