- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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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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Rectangular Prism Space Diagonal CalculatorFind the space diagonal of a rectangular prism (cuboid) from its length, width and height using d = √(l² + w² + h²). Free, instant.
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Grass Seed for a Rectangular Lawn CalculatorCalculate how much grass seed you need for a rectangular lawn from its length, width, and seeding rate. Get the amount in grams and kilograms.
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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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Rectangle Square Feet to Square Meters CalculatorConvert a rectangle's dimensions in feet to area in square meters. Enter length and width to get instant ft² and m² results with the 0.092903 factor.
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Rectangle CalculatorFree rectangle calculator: enter any two values (sides, area, perimeter or diagonal) to solve for the side lengths a and b, area A, perimeter P and diagonal.
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Length and Width of a Rectangle Given Perimeter CalculatorFind the missing length or width of a rectangle from its perimeter and one known side. Uses width = P/2 − length. Fast, free and accurate.
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Rectangle Diagonal CalculatorEnter a rectangle's length and width to instantly compute the diagonal using the Pythagorean theorem—handy for geometry, DIY, and construction.
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Rectangle Length CalculatorRectangle Length Calculator
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Rectangle Angle CalculatorCalculate rectangle angles easily with length and width input. Determine interior angles of rectangles for precise geometry calculations and design projects.
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Rectangle Area CalculatorEnter length and width to calculate rectangle area and perimeter in seconds. View results and the Area = Length × Width formula to size projects.
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Rectangle Width CalculatorRectangle Width Calculator
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Rectangle Perimeter CalculatorEnter length and width to instantly calculate a rectangle’s perimeter using P = 2(l + w). See the result and your inputs displayed for quick reference.
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Width of a Rectangle CalculatorFind the width of a rectangle from its area and length, or its perimeter and length. Free calculator using w = A/l or w = P/2 - l.
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Square Feet of a Rectangle CalculatorCalculate the area in square feet of a rectangle from its length and width, with instant conversions to square yards and square meters.
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Rectangle Diagonal Angle CalculatorFind the angle a rectangle's diagonal makes with its sides plus the diagonal length from width and height using θ = atan(h/w) and d = √(w²+h²).
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Rectangle Scale Factor CalculatorFind the linear scale factor between two rectangles and its area ratio. Enter original and new lengths to get k = new/old and k² instantly.
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Surface Area of a Rectangle CalculatorCalculate the surface area of a rectangle instantly. Enter length and width to get area (length × width) plus the perimeter. Free, fast and accurate.
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Perimeter of a Rectangle with Given Area CalculatorFind the perimeter of a rectangle from its area and width using P = 2(w + Area/w). Free, instant calculator with worked example and formula.
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Perimeter of a Rectangle CalculatorCalculate the perimeter of a rectangle instantly using P = 2 × (length + width). Enter length and width to get the perimeter and area in any units.
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Length of a Rectangle CalculatorFind the length of a rectangle from its area and width, or from its perimeter and width. Free, instant calculator with worked examples and formulas.
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Length and Width of a Rectangle Given Area CalculatorFind the missing length or width of a rectangle from its area and one known side. Free calculator with formula, perimeter, and worked example.
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Dimensions of a Rectangle CalculatorFind the length and width of a rectangle from its area and perimeter. Solves the quadratic instantly and returns the diagonal too.
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Golden Rectangle CalculatorFind the long side, area and perimeter of a golden rectangle from its short side using the golden ratio φ ≈ 1.618. Free, instant and accurate.
