Area Calculator
Calculate the area of a rectangle from its length and width.
Area Calculator
How this calculator works
Rectangle area equals length × width. Both measurements must use the same unit, and the result is expressed in square units.
When to use it
Use this calculator to check homework, verify a manual calculation, compare examples, and explore how changing each input affects the result. Enter all measurements in compatible units and interpret the answer within the context of your problem.
Formula and examples
Rectangle area equals length × width. Both measurements must use the same unit, and the result is expressed in square units.
Can I use decimal values?
Decimal values are supported when the mathematical operation permits them. Factorials require nonnegative whole numbers.
Why might a result be undefined?
Some operations have restrictions, such as division by zero, invalid logarithm bases, or a zero leading coefficient in a quadratic equation.