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 |