What you provide
What you provide
- Rectangle length: One positive side dimension.
- Rectangle width: Perpendicular positive side dimension.
GEOMETRY / LENGTH AND WIDTH
Rectangle Calculator
Calculate rectangle area, perimeter, diagonal, and aspect ratio from positive length and width.
- 01 Calculated in this tab
- 02 Values stay in this browser tab
- 03 Use boundary
Use boundary
Calculation path
Length times width gives area, paired side sums give perimeter, and the Pythagorean theorem gives diagonal.
Calculation path
Area = length x width; perimeter = 2(length + width); diagonal = sqrt(length^2 + width^2).
What you receive
What you receive
- Rectangle area
- Perimeter and diagonal
- Length-to-width aspect ratio
Use boundary
Choose the maximum decimal places shown. This does not increase source accuracy.
Use one consistent unit for both dimensions; squared output units apply only to area.
Results are educational math aids. Check notation, units, rounding, assumptions, and required precision before using an answer in graded, engineering, financial, or safety-critical work.