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Spa and Swimming Pool Size Formulas and CalculationsFrom time to time, a person may need to know a spa or pool size formula to calculate gallonage for pump run time or surface area for heating or painting for example. I will constantly add to this page as more people ask for specific calculations. GALLONAGE: 1)Rectangle: length x width x average depth x 7.5 (liters x 1000) 2)Round: diameter x diameter x average depth x 5.9 (liters x 785) 3)Oval: length x width x average depth x 6.7 (liters x 893) INTERIOR SURFACE OF POOL IN SQUARE FEET: length x width x 1.6 Believe it or not, this simple formula will work on almost any shape of shell! SURFACE AREA OF POOL WATER IN SQUARE FEET: 1)Rectangle: length x width 2)Round: radius(1/2 diameter) x radius x 3.14 3)Oval or Roman: 1/2 length x 1/2 width x 3.14 4)Kidney shape: length x width x 0.75 AMOUNT OF D.E. TO ADD TO FILTER: Square footage divided by 5 equals number of scoops or 1 pound coffee cans of D.E. to add to skimmer.
ENERGY/COST TO RUN PUMP: Amps x volts divided by 1000 = kilowatts Kilowatts x hours per day pump is run x kilowatt hour energy cost = cost per day to run pump. Note: you may have two amp values listed on your motor; the higher value is for 115 volts, the lower value 230 volts. Also, this value is peak amp rating, such as motor start up, the running amp value is probably about 10% lower.
The link below will take you to pump cost calulator, and also let you compare an average energy efficient pump to a variable speed pump Calculating the energy cost to run your pump return from pool size formulas to home page
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