Pool Running Cost Calculator
Estimate what it costs to run your pool each month. The pump is the biggest line, so enter your pump type, run hours, and electricity rate, and see how much a variable-speed pump could save you.
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estimated per month · about 0/year
Gear that lowers your monthly cost
The pump is the biggest line, so the best savings come from a more efficient pump and less evaporation.
These are estimates. Real costs vary with climate, local rates, how often you swim, and how warm you keep the water. The electricity line is calculated from your inputs; chemicals and top-up are typical averages.
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What It Costs to Run a Pool Each Month
A backyard pool has three recurring running costs: the electricity to run the pump, the chemicals to keep the water safe, and the fresh water you add to replace what evaporates. For most pools the total lands somewhere between 80 and 250 dollars a month, but the spread is wide because so much depends on your pump, your local rates, and your climate. The calculator above builds your estimate from your own pump type, run hours, electricity rate, pool size, and sanitizer, then sums them into a monthly range and an annual figure.
The Pump Is the Biggest Cost
The single largest running cost is almost always the pump, which can be the second-biggest electricity user in a home after air conditioning. The reason is simple: it runs for many hours a day, every day, all season. Monthly pump electricity is its wattage divided by 1,000 to get kilowatts, times the hours it runs per day, times 30 days, times your electricity rate. A single-speed pump pulling 1,800 watts for 8 hours a day at 16 cents per kilowatt-hour costs about 69 dollars a month just to circulate water.
Variable-Speed Pumps Change the Math
This is where pump choice matters most. A variable-speed pump moves water slowly over longer run times, and because power use drops sharply at lower speeds it averages closer to 400 watts for the same daily turnover. Run the same 8 hours at the same rate and the monthly electricity falls to roughly 15 dollars, a saving of more than 50 dollars a month against a single-speed pump on full blast. Most owners save 20 to 50 dollars or more per month after switching, and the higher purchase price usually pays back within a year or two. Many regions now require variable-speed pumps on new pool installs for exactly this reason.
Chemical Costs by Sanitizer
Your sanitizer choice sets your chemical bill. Chlorine tablets and liquid chlorine both run a few dollars per 5,000 gallons each month for routine dosing, so a 20,000-gallon pool spends a modest amount keeping free chlorine in range, plus occasional shock and balancing chemicals. A salt system has lower day-to-day chemical cost because the cell makes chlorine from the salt already dissolved in the water, so you buy far fewer jugs and tablets. The honest catch with salt is the cell itself, which wears out every 3 to 7 years and costs a few hundred dollars to replace. Spread over its life that adds a small monthly amount, which the calculator folds in so the comparison is fair.
Water Top-Up and Evaporation
Pools lose water to evaporation, splash-out, and backwashing the filter, so you top up with a hose from time to time. For most pools this is a small line, often just a few dollars a month, but it climbs in hot, dry, windy weather or if you backwash a sand or DE filter often. A pool cover is the easiest fix because the great majority of evaporation happens at the open surface. A cover also keeps heat in, so it lowers heating costs at the same time, which makes it one of the best-value purchases for any pool owner watching the monthly bill.
How to Cut Your Monthly Pool Bill
Because the pump dominates, that is where to start. Switch to a variable-speed model and run it only as long as you need to turn the water over once, which is often less time than a single-speed pump running flat out. Add a pool cover to cut both evaporation and heat loss. Keep your water balanced so you are not constantly buying chemicals to correct it, run the pump during off-peak electricity hours if your utility offers them, and clean the filter so the pump moves water with less effort. Small changes stack up into real monthly savings.
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Frequently Asked Questions
How much does it cost to run a pool per month?
For most backyard pools the monthly running cost lands somewhere between 80 and 250 dollars, with the pump being the largest single line. The exact figure depends on your pump type and run hours, your local electricity rate, the chemicals your sanitizer uses, and how much water you top up. A single-speed pump running 8 hours a day at 16 cents per kilowatt-hour costs roughly 69 dollars a month in electricity alone, while a variable-speed pump doing the same job can drop that to around 15 dollars.
What is the biggest cost of running a pool?
The pump is almost always the biggest running cost, often more than chemicals and water combined. A pool pump can be the second-largest electricity user in a home after air conditioning, because it may run many hours a day, every day. That is why pump type and run hours matter so much. Cutting the pump down to the hours you actually need for turnover, and choosing a variable-speed model, is the most effective way to lower a pool bill.
Do variable-speed pumps really save money?
Yes, and the savings are large. A single-speed pump draws roughly 1,800 watts, while a variable-speed pump averages closer to 400 watts for the same daily turnover because it moves water slowly over longer periods, and power use drops sharply at lower speeds. In practice owners commonly save 20 to 50 dollars or more per month after switching. The higher purchase price typically pays back within a year or two, which is why many regions now require variable-speed pumps on new installs.
Is a salt pool cheaper than a chlorine pool?
Salt pools usually have lower ongoing chemical costs because the salt cell makes chlorine from the salt already in the water, so you buy far fewer tablets or jugs of liquid chlorine. The catch is the salt cell itself, which wears out every 3 to 7 years and can cost a few hundred dollars to replace. Spread over its life that adds a modest monthly amount. Day to day a salt pool is cheaper to dose, but factor in cell replacement when you compare the true cost.
How can I cut my monthly pool costs?
Start with the pump, since it is the biggest cost. Switch to a variable-speed model and run it only as long as you need to turn the water over, often less than a single-speed pump on full blast. Add a pool cover to cut evaporation, which lowers both water top-up and heating costs. Keep your water balanced so you are not constantly correcting it, run the pump during off-peak electricity hours if your utility offers them, and clean the filter so the pump works less.
Why does a pool need water top-ups, and what do they cost?
Pools lose water to evaporation, splash-out, and backwashing the filter, so you periodically add fresh water with a hose. For most pools this is a small line on the monthly bill, often just a few dollars, but it climbs in hot, dry, windy weather or if you backwash often. A pool cover is the easiest fix because most evaporation happens at the open surface. Topping up also gently dilutes stabilizer and dissolved solids, which is generally healthy for the water.
Are these monthly cost estimates accurate for my pool?
They are solid estimates built from standard formulas, but your real numbers will vary with climate, local electricity and water rates, how often you swim, and how warm you keep the water. Electricity cost is calculated directly from your pump wattage, run hours, and rate, so that line is fairly precise. Chemical and top-up figures are rough averages that scale with your pool size and sanitizer type. Treat the total as a realistic range, then refine it with your own utility bills.