Pool Guides
Each calculator carries its own guide with the formula, a worked example and answers to the questions owners ask most. Pick the topic you are working on and the guide sits below the calculator on that page.
Volume & Size Tools
Work out how big your pool is and how much water it holds.
Pool Volume Calculator
Gallons = Surface Area (sq ft) x Average Depth (ft) x 7.48
Above Ground Pool Calculator
Gallons = Area (sq ft) x Water Depth (ft) x 7.48
Pool Gallons Calculator
Gallons = Length x Width x Average Depth x 7.48 x Shape Factor
Pool Size Calculator
Area = Length x Width. Perimeter = 2 x (Length + Width). Volume = Area x Depth x 7.48
Pool Capacity Calculator
Swimmers = (Shallow Area / 15) + (Deep Area / 20)
Pool Surface Area Calculator
Interior Area = Surface Area + (Perimeter x Average Depth)
Water Chemistry Tools
Get the dose right before you pour anything in the water.
Pool Salt Calculator
Pounds of Salt = Gallons x 8.34 x (Target ppm - Current ppm) / 1,000,000
Pool Chemical Calculator
Ounces = Gallons x ppm Increase x 0.0000834 / Product Strength x 16
Pool Shock Calculator
Pounds = (Target ppm - Current ppm) x Gallons x 8.34 / (1,000,000 x Strength)
Pool Chlorine Calculator
Dose = ppm Gap x (Gallons / 10,000) x Product Factor
Pool pH Calculator
Dose = pH Change x (Alkalinity / 100) x (Gallons / 10,000) x Product Rate
Pool Alkalinity Calculator
Baking Soda (lbs) = (Target TA - Current TA) / 10 x 1.5 x (Gallons / 10,000)
Pool Stabilizer (CYA) Calculator
Pounds = (Target CYA - Current CYA) x Gallons x 8.34 / 1,000,000
Muriatic Acid Calculator
Fluid Ounces = pH Drop / 0.4 x 26 x (Alkalinity / 100) x (Gallons / 10,000)
Equipment & Maintenance Tools
Size the gear that moves, filters and heats your water.
Pool Pump Size Calculator
GPM = Pool Gallons / (Turnover Hours x 60)
Pool Pump Run Time Calculator
Hours = (Gallons x Turnovers) / (Flow Rate x 60)
Pool Filter Size Calculator
Filter Area (sq ft) = Required GPM / Design Flow Rate
Pool Heater Size Calculator
BTU per Hour = (Gallons x 8.34 x Temp Rise) / Hours + (Surface Area x 12)
Pool Sand Calculator
Base Sand (tons) = Area (sq ft) x Depth (ft) x 100 / 2,000
Cost & Planning Tools
Plan the budget, the payments and the water you lose each week.
Pool Loan & Financing Calculator
Payment = P x r / (1 - (1 + r)^-n)
Pool Cost Calculator
Build Cost = Surface Area x Cost per Sq Ft + Extras
Pool Evaporation Calculator
Loss (lb/hr) = 0.1 x Area x (Pw - Pa) x Activity Factor
Pool Turnover Rate Calculator
Turnover Hours = Pool Gallons / (Pump GPM x 60)
Longer guides are on the way
Opening and closing checklists, algae recovery steps and winterizing costs are next. Until then, start with the Pool Volume Calculator and work outward from that number.