Rectangle perimeter
Find the total length around a rectangle.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
P = 2(length + width)
Variables & units
- Length
- cm · minimum 0, maximum 1000000000
- Width
- cm · minimum 0, maximum 1000000000
Worked example
An 8 cm by 5 cm rectangle has a perimeter of 26 cm.
Assumptions
Perimeter is a length, not an area.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
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