Rectangle Diagonal Calculator
Result
Diagonal13 cm
Area60 cm²
Perimeter34 cm
Aspect Ratio (l:w)2.4:1
Diagonal Angle (from length)22.6199°
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Rectangle Diagonal Calculator — free online calculator.
Formula
Diagonal = √(l²+w²); Area = l×w; Perimeter = 2(l+w); Aspect ratio = l/w; Diagonal angle = arctan(w/l)
- Rectangle Diagonal Calculator calculates its result from Length, Width, Arctan W L. It uses the formula Diagonal = √(l²+w²); Area = l×w; Perimeter = 2(l+w); Aspect ratio = l/w; Diagonal angle = arctan(w/l). Change any input to recalculate the result instantly.
- The main inputs are Length, Width. Enter them in the units and format shown in the calculator.
- Keep comparable quantities in compatible units whenever the formula combines or compares them.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Rectangle Diagonal
Inputs
- Length: 12 cm
- Width: 5 cm
Using Length = 2, Width = 3, Arctan W L = 12, the calculated result is 12.
Sample result: Calculating…
Frequently asked questions
What does the Rectangle Diagonal calculate?
Rectangle Diagonal Calculator — free online calculator.
Which values should I enter?
Enter Length, Width using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Diagonal = √(l²+w²); Area = l×w; Perimeter = 2(l+w); Aspect ratio = l/w; Diagonal angle = arctan(w/l).
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.