Rectangle Area and Perimeter Calculator
Enter two sides to get area, perimeter and diagonal.
Area24
Perimeter20
Diagonal7.21
How it is calculated
Area = a × b. Perimeter = 2 × (a + b). Diagonal = √(a² + b²).
Worked example
| Area | 24 |
| Perimeter | 20 |
| Diagonal | 7.21 |
FAQ
Works for squares?
Yes, enter the same value twice.
Are the results exact?
Results are estimates for information only; check official sources for binding figures.