Pool & Spa Calculators
Move from measured water volume to circulation, chemistry, heating, salt systems, seasonal maintenance, and operating costs with tools grouped by pool-care workflow.
Pool & spa workflow
Volume & Circulation
Establish water volume, turnover, evaporation, pump demand, filter capacity, and coordinated equipment-sizing relationships.
6 calculators
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Pool & Spa Pool Volume Calculator
Calculate pool volume in gallons and liters for rectangular, oval, kidney, and circular pools. Essential for chemical dosing, equipment sizing, and maintenance planning.
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Pool & Spa Pool Turnover Rate Calculator
Calculate pool turnover hours, daily turnovers, and required GPM from volume, flow, runtime, and target circulation goals.
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Pool & Spa Pool Water Evaporation Calculator
Estimate pool evaporation loss in inches and gallons with monthly refill water cost projections.
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Pool & Spa Pool Pump Sizing Calculator
Estimate required pool pump flow rate, hydraulic horsepower, and practical pump class from turnover goals and total dynamic head.
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Pool & Spa Pool Filter Sizing Calculator
Estimate required filter area and recommended sizing for sand, cartridge, and DE pool filters using design flow and oversizing assumptions.
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Pool & Spa Pool Equipment Sizing Calculator
Estimate pump flow, practical pump class, filter area, and heater BTU requirements for coordinated pool equipment sizing.
Pool & spa workflow
Water Chemistry
Calculate entered adjustments for chlorine, pH, alkalinity, calcium hardness, cyanuric acid, salt, and broader chemical-dosing plans.
7 calculators
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Pool & Spa Pool Chlorine Calculator
Calculate chlorine needed for your pool. Determine liquid chlorine, granular chlorine, or tablet doses based on current and target free chlorine levels with cost comparison.
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Pool & Spa Pool pH Calculator
Calculate muriatic acid or soda ash dosing to move pool pH from current reading to target range with alkalinity-aware estimates.
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Pool & Spa Pool Alkalinity Calculator
Calculate pool total alkalinity adjustments using sodium bicarbonate or acid-treatment estimates with staged dosing guidance for stable water balance.
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Pool & Spa Pool Calcium Hardness Calculator
Estimate calcium chloride needed to raise calcium hardness and dilution percentage guidance when CH is above target.
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Pool & Spa Pool Cyanuric Acid Calculator
Estimate stabilizer additions for target CYA and dilution guidance for elevated cyanuric acid levels.
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Pool & Spa Pool Salt Calculator
Calculate pool salt additions in pounds, kilograms, bag count, and estimated cost for saltwater chlorine generator salinity targets.
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Pool & Spa Pool Chemical Dosing Calculator
Calculate chemical doses for pool water balance. Determine exact amounts of chlorine, pH adjusters, alkalinity increaser, and calcium hardness needed for perfect pool chemistry.
Pool & spa workflow
Heating, Salt Systems & Spas
Plan heater output, salt-cell runtime, and hot-tub chemical quantities using measured water and manufacturer-entered equipment information.
3 calculators
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Pool & Spa Pool Heater BTU Calculator
Estimate required pool heater BTU/hr, fuel therm use, and heating cost from pool volume, temperature rise, and heat-up goals.
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Pool & Spa Saltwater Pool Cell Runtime Calculator
Estimate required salt cell runtime and output settings from pool volume, daily chlorine demand, and generator capacity.
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Pool & Spa Hot Tub Chemical Calculator
Estimate sanitizer, pH correction, and alkalinity dosing requirements for hot tub and spa water maintenance.
Pool & spa workflow
Startup, Seasonal Care & Costs
Organize pool opening, plaster startup, winterizing, and entered ownership-cost assumptions into practical maintenance workflows.
4 calculators
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Pool & Spa Pool Opening Chemical Calculator
Estimate startup pool chemical doses for chlorine, pH, and alkalinity adjustments from current and target readings.
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Pool & Spa Pool Plaster Startup Calculator
Estimate startup chemistry corrections for pH, alkalinity, calcium hardness, and stabilizer during new plaster curing.
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Pool & Spa Pool Winterizing Chemical Calculator
Estimate pool closing chemical doses for winterizing, including shock, polyquat, and stain or scale treatment.
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Pool & Spa Pool Cost Calculator
Estimate annual pool ownership cost across chemicals, energy, service, and repair reserve categories for budgeting and planning.
About These Pool & Spa Calculators
Pool care starts with a reliable water-volume estimate, because dosing, circulation, heating, and operating costs all depend on it. The calculators in this directory are grouped to follow that chain: establish volume, evaluate circulation equipment, work through measured water chemistry, and plan seasonal tasks.
Water chemistry and equipment decisions require current test results, exact product labels, manufacturer instructions, and applicable public-health or electrical requirements. A calculated dose or equipment value cannot inspect water, verify a product concentration, diagnose a circulation problem, or replace professional service where electrical, gas, structural, or health risks are involved.