Measurement Formulas
A graphical list of the formulas for measurement concepts. Print this page for reference.
See the online area calculator.
For additional formulas for common shapes and solids, try the page by page version of the formulas.
Shapes 
Formula 
Rectangle: Area = Length X Width A = lw Perimeter = 2 X Lengths + 2 X Widths P = 2l + 2w 

Parallelogram Area = Base X Height a = bh 

Triangle Area = 1/2 of the base X the height a = 1/2 bh Perimeter = a + b + c (add the length of the three sides) 
Trapezoid Perimeter = area + b1 + b2 + c P = a + b1 + b2 + c 

Circle Try the Online tool. The distance around the circle is a circumference. The distance across the circle is the diameter (d). The radius (r) is the distance from the center to a point on the circle. (Pi = 3.14) More about circles. d = 2r c = pd = 2 pr A = pr^{2} (p=3.14) 

Rectangular Solid Volume = Length X Width X Height V = lwh Surface = 2lw + 2lh + 2wh 

Prisms Volume = Base X Height v=bh Surface = 2b + Ph (b is the area of the base P is the perimeter of the base) 

Cylinder Volume = pr^{2 x} height V = pr^{2} h Surface = 2p radius x height S = 2prh + 2pr^{2} 

Pyramid V = 1/3 bh b is the area of the base Surface Area: Add the area of the base to the sum of the areas of all of the triangular faces. The areas of the triangular faces will have different formulas for different shaped bases. 

Cones Volume = 1/3 pr^{2} x height V= 1/3 pr^{2}h Surface = pr^{2} + prs S = pr^{2} + prs =pr^{2} + pr 

Sphere Volume = 4/3 pr^{3} V = 4/3 pr^{3}^{} Surface = 4pr^{2} S = 4pr^{2}^{} 
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