Rectangle Calculator
Rectangle area, perimeter, and diagonal. A square is the case length = width.
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How to use Rectangle Calculator
- Enter length, width. Leave a field blank only when the page says the value is missing.
- Read the result rows under the form. Errors appear in the status line. Nothing is uploaded.
- Rounding follows IEEE floating point in this browser unless the page says it uses integers or BigInt.
Rectangle Calculator
Area
| Computes | Rectangle area, perimeter, and diagonal. A square is the case length = width. |
|---|---|
| Includes | Area |
| Includes | Perimeter |
| Includes | Diagonal |
| Engine | geometry |
| Upload | None |
| Advice | Arithmetic only |
What Rectangle Calculator is
Area = lw. Perimeter = 2(l+w). Diagonal = √(l²+w²).
The formula runs in this tab. CZNull does not receive the numbers.
How this page computes
The diagonal is Pythagoras; see Pythagorean. A 3D box is not this page.
Entities and related jobs
Rectangle area, perimeter, and diagonal. A square is the case length = width. Named features: Area, Perimeter, Diagonal.
See also Pythagorean Theorem Calculator, Triangle Calculator, Circle Calculator.
Use cases
Rooms, screens, and sheet goods. This page assumes right angles. Paint coverage and 3D boxes are not computed here.
Limits
Invalid input appears in the status line. IEEE floating point applies unless a row says otherwise. CZNull does not receive the numbers.