How to Calculate
Water Volume
7.48 gallons per cubic foot.
1 cubic foot = 7.48 gallons.
1' Length x 1' width x 1' depth = 1 cubic foot
Cubic feet are measurements of Volume
Rectangle |
All water features can be broken down into one or more of these shape categories. Volume Calculations for each shape is listed for you below. For "odd-shaped" water features, simply break down the water feature into smaller categories that fit into the shapes listed below - then add them all together for a close approximation of volume and gallons.
For multiple, or variable depths - use an "Average Depth" measurement in the Depth calculations below.
Volume of a Rectangle
Length x Width x Depth = Cubic Feet.
Cubic Feet x 7.48 = Total Gallons.
Volume of a Square
Length x Width x Depth = Cubic Feet.
Cubic Feet x 7.48 = Total Gallons.
Volume of a Triangle
(Length x Width) x .5 x Depth = Cubic Feet.
Cubic Feet x 7.48 = Total Gallons.
Volume of an Ellipse or Oval
3.14 x (Length x .5) x (Width x .5) x Depth = Cubic Feet.
Cubic Feet x 7.48 = Total Gallons.
Volume of a Circle or Cylinder
3.14 x (radius* x radius*) x Depth = Cubic Feet.
Cubic Feet x 7.48 = Total Gallons.
*
radius = ½ diameter
Volume of a Half Circle
3.14 x (Radius x Radius) x .5 x Depth = Cubic Feet.
Cubic Feet x 7.48 = Total Gallons.
Radius = ½ diameter
Volume of a Quarter Circle
3.14 x (Radius x Radius) x .25 x Depth = Cubic Feet.
Cubic Feet x 7.48 = Total Gallons.
Radius = ½ diameter
Volume of a Circle Section (Pizza Slice)
Degree of Arch x (Radius x Radius) x Depth = Cubic Feet.
Cubic Feet x 7.48 = Total Gallons.
Volume of a Trapezoid
A 4 sided figure with one pair of parallel sides.
(Length 1 + Length 2) x .5
x Depth = Cubic Feet.
Cubic Feet x 7.48 = Total Gallons.
