Pool Tip #50: Pool Conversion Factors

Download Pool Tip #50: Pool Conversion Factors (PDF format, 70KB)

Linear Weights & Measures
1 inch 1/12 foot, 0.0833, 2.54 centimeters
12 inches 1 foot, 0.3048 meters
3 feet 1 yard, 0.9144 meters
5,280 feet 1 statute mile, 1.609 kilometers
6,076 feet 1 nautical mile, 1.852 kilometers
1 meter 39.37 inches, 3.28 feet, 1.094 yards
Area and Cubic Weights & Measures
1 square foot 144 square inches
1 square yard 9 square feet, 0.836 square meters
1 square meter 1.196 square yards
1 cubic foot 1,728 cubic inches
1 cubic yard 27 cubic feet, 0.765 cubic meters
1 cubic meter 1.308 cubic yards
1 acre foot 325,851 gallons
Water
1 cubic foot of water 7.48 gallons, 28.32 liters
1 gallon of water 8.33 pounds
1 cubic foot of water 62.4 pounds
1 ppm 8.3 pounds/million gallons of water
1 ppm 1 mg/liter
100 microns Approx. size of a grain of salt, 0.1 millimeters, 0.0039 inches
Liquid Weights & Measures
1 cup 8 fluid ounces
1 pint 16 fluid ounces, 0.473 liters
1 quart 32 fluid ounces, 0.946 liters
1 gallon 128 ounces, 16 cups, 8 pints, 4 quarts, 3.785 liters
1 pound 16 ounces
1 liter 1.057 liquid quarts
1 tablespoon 3 teaspoons, 1/2 fluid ounce
1 gram 0.03527 ounces
Temperature Conversion
Celsius to Fahrenheit F° = 9/5 C° + 32
Fahrenheit to Celsius C° = 5/9 (F° – 32)
Hydraulic Conversions
1 psi 2.31 feet of head
1 foot of head 0.433 psi
1 inch of mercury (Hg) 1.13 feet of water
1 lpm 0.264 gallons per minute
1 gpm 3.78 liters per minute
Pipe sizing [0.32 × flowrate in gpm] ÷ pipe area in2 = feet per second
1 gpm 0.264 liters per minute
1 lpm 3.78 gallons per minute
Estimating Pool Area & Volume
Circle V = p r2 D
Kidney V = (A + B) × L × 0.45 × D
Ellipse V = (L × W) + p r2 × D
Rectangle V = L × W × D
Oval V = [p (A × B)] × D
Gauges
Dirty Filter
Vacuum: Down from start–up reading
Influent: Up
Effluent: Down
Flowmeter: Down
Blocked suction line, clogged hair & lint strainer
Vacuum: Up from start–up reading
Influent: Down
Effluent: Down
Defective pump seal, clogged impeller
Vacuum: Down from start–up reading
Influent: No change
Effluent: No change
Restricted return line, partially closed valve
Vacuum: Down from start–up reading
Influent: Up
Effluent: Up
Partially closed valve opened
Vacuum: Up from start–up reading
Influent: Up
Effluent: Up