About this calculator
Use any unit; the area comes out in that unit squared.
How to use it
- Enter the length.
- Enter the width.
- Read the results.
The formula
Area = l × w; perimeter = 2(l + w); diagonal = √(l² + w²)
- l, w
- length and width
Worked example
12 by 5
- Area = 60.
- Perimeter = 34; diagonal = 13.
What the result means
For a plot in feet, the area converter turns square feet into gaj, bigha and more.
Assumptions
- All lengths in the same unit.
Limitations
- Results are rounded to 10 significant figures.
Frequently asked questions
What is the area of a rectangle?
Length × width.
What is the perimeter?
2 × (length + width).
How do I find the diagonal?
√(length² + width²).
Last reviewed on 3 October 2026. Found a mistake? Tell us.