01
Formula
Gallons = cubic feet × 7.48051948.
Salt pounds = gallons × ppm × 8.34 / 1,000,000. Scaled dose = gallons / 10,000 × the label amount. Pump GPM = gallons / (hours × 60). Average depth is your measurement, not a code depth.
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Pool volume calculator for gallons, salt, and turnover
This pool volume calculator finds gallons from length, width, and average depth, or from a round or oval pool. It then scales salt, a label dose, and the flow a pool turnover calculator needs.
Pool volume
19,150gal
Cubic feet2,560
Salt to add79.86 lb
Label dose, scaled19.15 fl oz
Pump flow for that turnover39.90 GPM
Volume and scaling arithmetic only. Chemical amounts must follow the product label. Salt and turnover figures are planning estimates, not a water-care prescription.
How it works
Gallons are cubic feet times 7.48051948.
A rectangle is length times width times average depth. A round pool is pi times the radius squared times depth. An oval is pi times half the length times half the width times depth. Multiply cubic feet by 7.48051948 to get US gallons. Salt pounds equal gallons times the ppm you want to add times 8.34, divided by one million. That treats water as 8.34 pounds per gallon. The chemical line only scales a dose you copy from the label, per 10,000 gallons. It does not choose a chemical. Turnover flow in gallons per minute is the volume divided by the hours you enter, divided by 60.
02
Example
A 32 by 16 foot pool, 5 feet average depth.
The water is 2,560 cubic feet, about 19,150 gallons. Adding 500 ppm of salt is about 79.86 pounds. A label dose of 10 fluid ounces per 10,000 gallons scales to about 19.15 fluid ounces. An 8 hour turnover needs about 39.90 GPM. The 8 hours is an input, not a rule.
03
Tips
Average the shallow and deep ends.
A hopper is not one depth. Use the average that matches the water you actually hold, or break the pool into a rectangle and a wedge and add the gallons. The salt and dose lines follow whatever gallon total you produce.
04
Equipment
A commercial pump is equipment. The dose is not.
The pool pump calculator line is a flow target, not a product pick. If a business is buying pool or other equipment from $15,000 to $2 million, Dengaro can take the application. Read the chemical label before you add anything.
Important questions
Know what to expect.
How does the pool salt calculator convert ppm to pounds?+
One ppm is one pound of salt per million pounds of water. At 8.34 pounds per gallon, pounds of salt equal gallons times ppm times 8.34 divided by 1,000,000. Enter how many ppm you want to add, not the final reading, unless you are starting from zero.
Is this a pool chemical calculator for chlorine?+
It scales the dose printed on a label. Enter that label's amount per 10,000 gallons. The page does not decide which product to use or whether the water needs it.
What does the pool turnover calculator assume?+
Only the hours you type. Flow equals gallons divided by those hours, then divided by 60 to get gallons per minute. Eight hours is the starting input so a number appears. Change it to the turnover you are designing for.
Does a round pool use diameter or radius?+
Enter the diameter. The formula uses half of that as the radius, then pi times radius squared times depth.
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