Pool Running Cost Chart
Typical monthly pool running costs by pool size and pump type, single-speed versus variable-speed, plus chemicals. See why the pump dominates your pool bill.
Quick answer: Most pools cost $40 to $160 a month to run before heating. The pump drives 60 to 80% of that. A single-speed pump can cost $60 to $160 a month in power, while a variable-speed pump doing the same turnover often runs $15 to $45. Chemicals add another $20 to $50. See your real numbers with the Pool Cost Calculator.
Pool running costs come down to two big buckets: the electricity to circulate the water and the chemicals to keep it sanitary. Heating sits on top of that and varies so much by climate that it deserves its own conversation. The chart below shows realistic monthly ranges by pool size and pump type, assuming an 8-hour daily turnover and an electricity rate near the US average of about 15 cents per kilowatt-hour. The headline takeaway is simple: your pump choice matters more than your pool size.
Pool running cost chart by size and pump type
Ranges are estimates for circulation plus chemicals, excluding heating. Actual cost depends on your electricity rate, run time, climate, and how clean you keep the system.
| Pool size | Single-speed pump / mo | Variable-speed pump / mo | Chemicals / mo | Typical total (variable-speed) |
|---|---|---|---|---|
| Small (5,000 to 12,000 gal) | $40 to $70 | $10 to $20 | $20 to $35 | $30 to $55 |
| Medium (12,000 to 20,000 gal) | $60 to $110 | $15 to $30 | $25 to $45 | $40 to $75 |
| Large (20,000 to 30,000 gal) | $90 to $150 | $25 to $40 | $35 to $55 | $60 to $95 |
| Extra large (30,000+ gal) | $120 to $160+ | $30 to $45+ | $40 to $60 | $70 to $105+ |
Read the table by row, not by guessing a single number. A medium pool on an old single-speed pump might cost $60 to $110 in electricity, but the same pool on a variable-speed pump drops to $15 to $30. That gap is the whole story of pool running costs.
Why the pump dominates the bill
A pump motor uses energy in proportion to how hard it pushes water, and that relationship is steep. Doubling the speed of a pump can roughly multiply its power draw by a factor of eight. A single-speed pump only knows one setting, full blast, so every hour it runs costs the same high amount. A variable-speed pump can idle at a fraction of that speed and still complete a full turnover by simply running longer. Because the slow setting sips power, the longer run time costs far less overall. That is why the pump can swing your monthly bill by $100 or more while the pool size only nudges it.
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What drives chemical costs
Chemical spending tracks pool size, sun exposure, and how disciplined your routine is. Bigger pools need more chlorine, acid, and stabilizer. Strong sun burns off chlorine faster, especially when cyanuric acid is low, so under-stabilized pools quietly waste chlorine all summer. Saltwater pools shift much of the chlorine cost to electricity through the salt cell, then add a salt top-off now and then. The most expensive chemical habit is reactive dosing, where you fight cloudy water and algae after the fact instead of holding steady targets. Balanced water from the Chemical Dosing Cheat Sheet keeps that bucket small and predictable.
Levers that lower your monthly cost
Run slow and long
Use the Pump Turnover Chart to find the flow you actually need, then a variable-speed pump can deliver it at a low, cheap RPM. A long slow turnover also filters finer particles than a short fast one.
Cover the water
A solar or thermal cover slashes evaporation, which cuts both water top-off and the chemical loss that rides along with it. Covers also reduce heating costs sharply if you heat the pool.
Keep the system clean and balanced
A clogged filter or dirty cell forces the pump to work harder and longer. Balanced water means fewer corrective chemicals. Both keep the monthly number near the low end of the ranges above. Plug your own pool, pump, and electricity rate into the Pool Cost Calculator to see exactly where your money goes.
Frequently Asked Questions
How much does it cost to run a pool per month?
A typical residential pool costs roughly $40 to $160 a month to run, not counting heating. The single biggest variable is the pump. An older single-speed pump can cost $60 to $160 a month in electricity alone, while a variable-speed pump doing the same job often runs $15 to $45. Chemicals usually add $20 to $50 a month depending on pool size and climate.
What is the most expensive part of running a pool?
For most owners it is the pump, which can account for 60 to 80% of the running cost before any heating. A single-speed pump draws full power any time it runs, so eight hours a day adds up fast. Switching to a variable-speed pump and running it slower for longer is the single highest-impact way to cut a pool electric bill.
How much can a variable-speed pump save?
Because power use rises steeply with motor speed, running a variable-speed pump at a lower RPM for a longer schedule can cut pump energy use by 50 to 80% versus a single-speed pump on the same turnover. On a mid-size pool that often means dropping from around $90 a month to $20 to $30 a month, so the pump can pay for itself in a season or two.
Does pool size change the cost much?
It matters, but less than the pump type. A larger pool holds more water to circulate and treat, so both energy and chemical costs climb. Still, a big pool with a variable-speed pump can easily cost less to run than a small pool with an old single-speed pump. Pump efficiency, your electricity rate, and run time drive the bill more than gallons alone.
Do these costs include heating?
No. The ranges here cover circulation and chemicals only. Heating is a separate and often larger cost that depends entirely on your climate, target temperature, heater type, and whether you use a solar or thermal cover. A gas heater can add hundreds of dollars a month in cool weather, while a cover dramatically cuts both heating and evaporation losses.
How do I lower my pool running costs?
Start with the pump: install or program a variable-speed unit and run it slow for a long turnover instead of fast for a short one. Add a solar cover to cut evaporation and chemical loss, keep your filter clean so the pump works less, and balance your water so you are not chasing problems with extra chemicals. Right-sized run time beats brute force every time.
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