Pool & spa calculators

Pump Electricity Cost Calculator

Pump watts times run hours times your all-in kWh rate, broken into daily, billing-period, and annual cost.

Outputs: Energy used (kWh) · Electricity cost · Cost per day (USD)

Pump Runtime Calculator

Hours per turnover from gallons and pump GPM, times your daily turnovers. Most pools need 1-2 turnovers a day.

Outputs: Hours per turnover (hrs) · Daily run time (hr)

Water Replacement Cost Calculator

Full or partial refill cost split into water and sewer portions, because many utilities bill sewer on water use.

Outputs: Water portion (USD) · Sewer portion (USD) · Water cost

Pool Fill Time Calculator

Pool gallons divided by hose GPM and hose count gives fill hours plus water cost. Time it with a bucket test first.

Outputs: Time to fill (hrs) · Water cost (USD)

Salt Addition Calculator

From current to target salinity: pounds of pool salt, 40-lb bags to buy, and total cost. Re-test 24 hours after adding.

Outputs: Pool salt needed (lbs) · Bags to buy · Salt cost (USD)

Chlorine Dose Calculator

Enter test-kit FC and jug strength to get liquid chlorine in fluid ounces, cups, gallons, and dose cost. Dose at dusk.

Outputs: Bleach needed (fl oz) · Bleach (gal) · Bleach (cups)

Spa Volume Calculator

Spa gallons from shell dimensions plus fill cost. Small volumes need teaspoon precision, not gallon guesses.

Outputs: Spa volume (gal) · Cost to fill (USD)

Pool Volume Calculator

Measure length, width, and average depth to get pool gallons, liters, fill cost, and water weight. Every chemical dose starts here.

Outputs: Pool volume (gal) · Volume in liters (L) · Cost to fill (USD)

Chlorine Cost Comparison (Liquid vs Tablet vs Salt)

Use this free Chlorine Cost Comparison (Liquid vs Tablet vs Salt) (liquid chlorine vs tablets cost). Enter your pool numbers and press Calculate —...