Calculation Guide
General Equivalents
27.55 (5 gal buckets) = 1 cubic yard
27 cubic feet = 1 cubic yard
128 cubic ft = 1 cord wood
43,560 sq ft per acre
640 acres = 1 sq. mile
9 sq ft = 1 sq yd
linear feet = length (no width)
2,000 pounds = 1 ton
Circle
Circumference
diameter × 3.1416
or
radius × 2 × 3.1416
Area
diameter × 0.7854
or
radius × radius × 3.1416
Triangle
Circumference
add length of all sides
Area
½ base × height
or
base × height divide by 2
Rectangle
Area
length × width
Square
Area
length × width
Sphere
Surface Area
radius × radius × 3.1416 × 4
Trapezoid
Area
add 2 parallel sides × height divide by 2
