Rectangle Perimeter
Perimeter measures the full boundary of a rectangle. Opposite sides are equal, giving two copies of each dimension.
Rectangle Perimeter
Plane shapes · 2 inputs
How to use this calculator
- Enter length in cm.
- Enter width in cm.
- Select Calculate and keep the output unit with the answer.
Before you use the answer
Start with a dimensioned sketch and label the units beside every measurement. Distinguish the outer edge from an internal opening, and distinguish a radius from a diameter. A geometric model is most useful when the shape actually matches the assumptions in the formula.
A perimeter is a length, not an area. It does not describe how much material covers the surface.
Does it save my inputs?
No calculation history is stored by this website. The calculator works locally in your browser. See the privacy policy for hosting and contact details.
Why might a result be approximate?
Measurement uncertainty, ideal-model assumptions and floating-point rounding can all matter. Displaying more digits does not improve the original measurement.
Related calculations
Rectangle Diagonal
The diagonal joins opposite corners and forms a right triangle with the two sides.
Open calculator ↗Square Area
A square has two equal perpendicular dimensions.
Open calculator ↗Square Perimeter
A square has four equal edges, so one side determines the full boundary.
Open calculator ↗