Pool Volume Calculator/18 Foot Round Pool Volume Calculator
Standard Specs: 18 ft Diameter x 4 ft Average Depth
18 Foot Round Pool Volume Calculator
Exact Gallon Specs for 18 ft Round Above-Ground Pools
An 18-foot round pool holds approximately 7,646 gallons (28,940 liters) with a 48-inch wall (4ft water depth), or 8,284 gallons with a 52-inch wall. Calculate exact volume and chemical maintenance requirements below.
Water Capacity Dashboard
Adjust average water depth if your pool has a different wall height.
Average Water Depth4 feet
US Gallons
7,646
Total liquid capacity
Metric Liters
28,943
International standard
Water Weight
31.9 Tons
63,768 lbs total load
Chemical Dosage Starting Numbers for 7,646 Gallons
Salt to Reach 3,200 PPM
6 Bags (40-lb)
Cal-Hypo Routine Shock
0.8 lbs (68-73%)
Liquid Chlorine Shock
0.6 Gallons (12.5%)
18-Foot Round Pool Water & Chemical Specs
• Total Water Volume: ~7,650 Gallons (28,940 Liters)
• Salt to Reach 3,200 PPM: ~204 lbs (5 forty-pound bags)
• Weekly Shock: 1 one-pound bag of Cal-Hypo shock or 0.6 gal liquid chlorine.
Pump Flow Rate & Filtration Requirements
An 18ft pool requires a minimum pump turnover of 8 hours. At 7,650 gallons, your pump should deliver at least 1,000 to 1,500 GPH (gallons per hour) flow rate for crystal clear circulation.
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Frequently Asked Questions: 18 Foot Round Pool Volume Calculator
Using a standard garden hose running at 9 gallons per minute (540 gal/hour), filling an 18ft pool takes approximately 14 to 16 hours.
For initial fill sanitization, add 1.5 lbs of shock to raise Free Chlorine to 10 ppm, then maintain 2 to 4 ppm with 3-inch stabilized chlorine tablets.