Rectangle Calculator
Calculate area, perimeter and diagonal of a rectangle from length and width.
Inputs
units
units
Area
60.0000sq units
Perimeter
32.0000units
Diagonal
11.6619units
Step by step
Area
A = 10 × 6
= 60
Perimeter
P = 2(10 + 6)
= 32
Diagonal
d = √(10² + 6²)
= 11.6619
How it works
A rectangle's area is length × width, its perimeter is 2(l+w), and its diagonal follows the Pythagorean theorem.
Formulas
Area
A = l × w
- l
- Length
- w
- Width
Diagonal
d = √(l² + w²)
- l
- Length
- w
- Width
Frequently Asked Questions
Is a square a special rectangle?
Yes — a square is a rectangle where length equals width.
How many diagonals does a rectangle have?
Two, and they are equal in length and bisect each other.