Perimeter Calculator
Calculate the perimeter of various geometric shapes.
Select Shape
Perimeter
30.0000
units
Calculation
Formula
P = 2(l + w)
Calculation
P = 2(10 + 5) = 2(15) = 30
Perimeter Formulas
Rectangle
P = 2(l + w)
Square
P = 4s
Circle
C = 2πr
Triangle
P = a + b + c
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
📚
Formula Source: Handbook of Mathematical Functions
by Abramowitz & Stegun
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.