A pool pump is often one of the biggest electricity users in a home that has one. An older single-speed pump running 8 hours a day can easily cost $2 to $3 a day at average US electricity prices, while a well-programmed variable-speed pump can often do the same job for well under $1 a day. Here’s how to calculate your own cost and the simplest ways to bring it down.
Quick answer
| Pump setup (example) | Power | Hours/day | kWh/day | Cost/day at $0.18 | Cost/month |
|---|---|---|---|---|---|
| Single-speed, ~1.5 hp | 1,800 W | 8 | 14.4 | $2.59 | ~$78 |
| Single-speed, cut to 6 h | 1,800 W | 6 | 10.8 | $1.94 | ~$58 |
| Variable-speed, low speed | 250 W | 16 | 4.0 | $0.72 | ~$22 |
| Variable-speed, mixed schedule | 250 W × 14 h + 1,200 W × 2 h | 16 | 5.9 | $1.06 | ~$32 |
Wattages are illustrative examples; check your pump’s label. Electricity cost uses ~$0.18/kWh, close to the U.S. EIA’s mid-2026 average residential price. Your rate may differ.
The pool pump cost formula
Watts ÷ 1,000 × hours per day × price per kWh = cost per day
Step 1: Find your pump’s wattage
Look at the motor label. If it lists watts, use that. If it only lists volts and amps, multiply them for a rough estimate:
- 230 volts × 8 amps ≈ 1,840 W
The horsepower number on the label doesn’t translate neatly to electricity use, so volts × amps (or a watt figure) is more reliable. For the most accurate reading, many variable-speed pumps show live wattage on their control panel.
Step 2: Find your electricity rate
According to the U.S. EIA, the average US residential price was about 18 cents per kWh in mid-2026. Pool-heavy states can be above or below that. Divide your bill total by kWh used to get your real rate — our guide on how to read your electric bill shows where to find both numbers.
Step 3: Multiply
Example: 1,800 W pump, 8 hours a day, $0.18/kWh
- 1,800 ÷ 1,000 = 1.8 kW
- 1.8 kW × 8 h = 14.4 kWh/day
- 14.4 × $0.18 = $2.59/day
- × 30 = ~$78/month
- × 6-month season = ~$467/year
- × 12 months (year-round pools in warm states) = ~$934/year
Why variable-speed pumps use so much less
This is where pool pumps get interesting. A pump’s power use drops much faster than its speed. ENERGY STAR notes that reducing pump speed by one-half allows the pump to use just one-eighth as much energy.
At half speed, the pump moves about half as much water per hour, so you need to run it roughly twice as long to filter the same volume. But:
- 1/8 the power × 2 times the hours = about 1/4 of the energy
That’s why the best strategy with a variable-speed pump is usually low and slow: long run times at low speed, with short bursts of higher speed only when you need them (vacuuming, running a spa jet, some heaters or chlorinators).
Key takeaway: running a variable-speed pump on high all day wastes most of its advantage. Program it.
What ENERGY STAR says
According to ENERGY STAR, certified in-ground pool pumps use about 20% less energy than standard pool pumps and can save roughly $50 a year, paying for themselves in under 2 years; certified above-ground pumps use about 11% less energy and can save around $20 a year. Those comparisons are against today’s standard pumps. If you’re replacing an old single-speed pump, your savings can be much larger, as the examples above show.
Federal rules changed in 2021
Since July 19, 2021, U.S. Department of Energy efficiency rules have applied to most residential pool pumps (those rated up to 2.5 hydraulic horsepower, roughly 5 total horsepower). The rule doesn’t technically ban single-speed pumps, but pump makers note that most single- and two-speed pumps of about 1 hp and up struggle to meet it — so if your old pump fails, the replacement you’re offered will very likely be variable-speed.
How long should a pool pump run?
The aim is to circulate (or “turn over”) your pool’s full volume through the filter often enough to keep water clean and chemicals mixed. Many pool pros aim for at least one full turnover a day, and more in hot weather or heavy use. ENERGY STAR’s installer guidance is to set the lowest speed that still gives adequate circulation.
How to estimate your run time:
- Pool volume (gallons) — from the builder or an online calculator.
- Flow rate (gallons per minute) at your chosen speed — shown on many variable-speed controllers.
- Volume ÷ (GPM × 60) = hours for one turnover.
Example: 20,000 gallons ÷ (30 GPM × 60) = 20,000 ÷ 1,800 ≈ 11 hours.
Then watch the water. If it stays clear and balanced, try trimming run time or speed a little at a time. If it turns cloudy or green, you’ve gone too far.
7 ways to lower your pool pump cost
- Upgrade to a variable-speed pump if you still have a single-speed. Check your utility for rebates — many offer them for efficient pool pumps.
- Program low speed for filtering. Save high speed for short cleaning cycles.
- Shift run time off-peak. On a time-of-use plan, running overnight or outside peak hours can cut the cost per kWh. See time-of-use electricity rates explained.
- Keep baskets and filters clean. Clogged skimmer baskets, pump baskets and dirty filters make the pump work harder for the same flow.
- Use a pool cover. Less debris means less filtering, and a cover reduces evaporation and heat loss if you heat the pool.
- Right-size run time by season. Pools often need less circulation in cooler months than in peak summer.
- Watch your other pool equipment. Electric pool heaters and heat pumps can use far more electricity than the circulation pump. Our guide to what uses the most electricity at home puts pool equipment in context.
Is upgrading worth it? A quick payback check
Using the table examples:
- Single-speed at 8 h/day: ~$78/month
- Variable-speed, mixed schedule: ~$32/month
- Difference: ~$46/month
| Season length | Yearly savings (example) |
|---|---|
| 5 months | ~$230 |
| 8 months | ~$368 |
| 12 months | ~$552 |
Divide the installed price difference by your yearly savings to get a rough payback. For year-round pools in warm climates, the payback tends to be quickest. These are illustrations — your pump, plumbing, pool size and rates will change the result, so use your own numbers.
Frequently Asked Questions
How much does it cost to run a pool pump per month?
Using about $0.18/kWh, an older single-speed pump running 8 hours a day typically costs around $60–$80 a month, while a variable-speed pump on a low-speed schedule can often run for roughly $20–$35. Use your pump’s watts and your own rate for an exact figure.
Is it cheaper to run a pool pump at night?
Only if your utility charges less at night (a time-of-use plan). On a flat rate, the cost per kWh is the same any time. Some owners also run part of the cycle during the day when chlorine is used up fastest by sunlight.
Can I turn my pool pump off for a day?
Occasionally skipping a short period is unlikely to cause problems in well-balanced water, but long gaps can lead to cloudy water or algae, especially in heat. Reducing speed and hours gradually is safer than switching off.
Does a bigger pump clean better?
Not necessarily. An oversized pump can waste energy and push water faster than the filter works best. Matching the pump to your pool and plumbing matters more than raw horsepower.
How long does a variable-speed pump take to pay back?
ENERGY STAR says certified models pay for themselves in under 2 years compared with standard pumps. Against an older single-speed pump, the payback can be faster, depending on your run time and electricity rate.
The bottom line
To find your pool pump running cost, multiply its kilowatts by hours per day and your rate per kWh. With an older single-speed pump, that often lands around $2–$3 a day at today’s average US prices. The biggest savings come from running a variable-speed pump at low speed for longer, keeping filters clean and shifting run time off-peak where your utility rewards it. Savings vary by climate, pool, equipment and rates, but a few minutes with the formula above will show you exactly where your money is going.
Figures in this guide are estimates based on typical US prices at the time of writing. Savings vary by home, climate and utility rates — check your own bill before making a purchase.
