CALCULATOR
Rectangle Perimeter Calculator
Find the distance around a rectangle from its length and width.
How the calculation works
Perimeter = 2 × (length + width).
Worked example
With length 5 m, width 3 m, perimeter is 16 m.
Assumptions and limits
A flat rectangle with four right angles. Both dimensions are in meters. This measures the boundary only; it does not include joins, cuts, gates or material waste.