Carregando ferramenta...
How to use
- 1Enter length and width using consistent units.
About
Results keep the input unit; area is in square units.
Rectangle calculator
Calculate rectangle area, perimeter and diagonal from length and width.
A = length × width, P = 2(length + width) and d = √(length² + width²).
Length and width must use the same unit.
Area is shown in square units and diagonal in the original unit.
Practical examples
- An 8 × 3 rectangle has area 24, perimeter 22 and diagonal about 8.544.
Limitations and notes
- Both dimensions must be positive.
- Use valid values and keep all units consistent.
How to use
- 1Enter length and width.
- 2Run the calculation.
- 3Review area, perimeter and diagonal.
Frequently asked questions
How is the diagonal found?
It is the hypotenuse of a right triangle formed by the two sides.
Related tools
Other tools
Percentage Calculator
Calculate percentages easily.
Rule of Three Calculator
Work out the missing proportional value from three known values.
Discount Calculator
Calculate discounted value.
Percentage Increase Calculator
Calculate percentage increase.
Simple Interest Calculator
Calculate simple interest.
Compound Interest Calculator
Calculate compound interest.