- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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Perimeter of a Rectangle CalculatorCalculate the perimeter of a rectangle instantly using P = 2(l + w). Enter length and width to get perimeter, area, and diagonal.
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TV Screen Size CalculatorCalculate a TV or monitor's actual width, height and screen area from its diagonal size and aspect ratio (e.g. 16:9). Free, instant, accurate.
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Cubic Feet of a Rectangle (Box) CalculatorCalculate the cubic feet (volume) of a rectangular box from its length, width and height in feet. Get instant ft³, yd³ and in³ results.
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Rectangular Prism Volume CalculatorCalculate the volume of a rectangular prism (cuboid) instantly with length × width × height. Also shows surface area. Free and easy to use.
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Rectangle Aspect Ratio CalculatorFind the aspect ratio of any rectangle from its width and height. Reduces to the simplest integer ratio (e.g. 1920×1080 = 16:9) plus a decimal ratio.
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Square Meters of a Rectangle CalculatorCalculate the area of a rectangle in square meters instantly. Enter length and width in meters to find m² area plus the perimeter.
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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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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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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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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.
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Rectangle Area and Perimeter CalculatorCalculate the area and perimeter of a rectangle from its width and height. Enter both sides in the same length unit to get area in unit squared and perimeter.
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Rectangle CalculatorFree rectangle calculator: enter length and width to instantly find the area, perimeter, and diagonal of any rectangle with clear formulas.
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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.
