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Pool Cover Savings Calculator
Gallons and dollars a cover saves versus uncovered evaporation at your water rate.
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Pool & spa calculators
Volume, chemistry, heating, pumps, and pool costs, each with visible math.
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Backwash Water Loss Calculator
Gallons per backwash cycle and per month from filter GPM, minutes, and frequency, plus water cost.
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Pool Evaporation Calculator
Weekly and period water loss in gallons from surface area and bucket-test inches, plus refill cost.
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Pool Drain Time Calculator
Drain hours and days from gallons and pump or siphon GPM. Check local rules on where drain water may go.
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Pool Gallons by Dimensions Calculator
Gallons from length, width, shallow and deep ends with a sloped-floor average, plus fill cost.
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Freeform Pool Volume Calculator
Kidney and freeform gallons estimate from overall length, width, and average depth, plus fill cost.
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Round Pool Volume Calculator
Round pool gallons from diameter and depth, plus fill cost. Verify Intex and Bestway printed capacity before dosing.
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Oval Pool Volume Calculator
Oval above-ground gallons from longest axis, shortest axis, and depth, plus fill cost at your water rate.
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Alkalinity Adjustment Calculator
Baking soda in ounces, pounds, and 4-lb boxes to reach target TA. Fix alkalinity before touching pH.
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Pool Heater BTU Calculator
BTU output needed from gallons, temperature rise, and heat-up hours, plus the rated size to buy after efficiency.
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