A single-speed pool pump is often the second-largest electrical load in a house after heating and cooling, and it is the one most people never think about.
Cost to run your pool pump: $500, ranging from $430 to $600.
Cost to run your pool pump
medium confidence
$500Per year, over a 6-month season
$430 lowhigh $600
United States average
Assumptions 2026.07.1
Why medium: no state was resolved, so national averages were used; the modeled range spans about 34% of the typical value; motor efficiency varies considerably between pumps, and real flow depends on plumbing and filter condition.
Quick facts
Per month in season
$84($71 – $100)
Electricity used
2,738 kWh(2,327 kWh – 3,285 kWh)
Power draw
1,875 WRuns at full speed whenever it is on.
Time for one full turnover
6.7 hoursCirculating all 18,000 gallons once. Most pools need one turnover a day, not continuous running.
A variable-speed pump would cost
$129Running 14 hours a day at lower speed for the same turnover.
Annual saving if upgraded
$373
Cost breakdown
Estimated cost of each component, with low, typical, and high values.
Component
Low
Typical
High
Pool pump electricity — single speedEnergy2,738 kWh over 6 months at $0.1834/kWh.
$430
$500
$600
Cost to run your pool pump
$430
$500
$600
The low and high columns above will not add up to the headline range. Each line has its own uncertainty, and every line landing at its worst case at the same time is unlikely, so the total combines them as partially independent rather than summing the extremes.
What moved your estimate
↑
Single-speed pump — increases the estimate
Single-speed pumps are frequently the largest electrical load in a home after heating and cooling. Because power falls with the cube of speed, a variable-speed pump doing the same turnover would cost roughly $129 a year instead of $502.
How this number was produced+
Power draw1.5 HP × 1250 W/HP × 1 speed factor1875 W
Annual hours8 hr/day × 183 days1,460 hours
Annual energywatts × hours ÷ 1,0002,738 kWh
Annual costkWh × $0.1834$502
Adjustments applied
Single speed×1.00
Runs at full speed whenever it is on. Power varies with the cube of speed, so halving speed uses about an eighth of the power.
6-month season×0.50
Estimated from your climate — Unweighted mean of state degree days (2021–2025 mean); no state resolved.
Electricity rate×1.00
United States residential average of $0.1834/kWh (EIA, June 2026).
Notes and sources2 notes, 1 source
Worth knowing
Horsepower on the nameplate is shaft output, not electrical input. A single-speed motor draws meaningfully more at the wall than its rating suggests, which is why the watts figure above exceeds 746 per horsepower.
This covers the circulation pump only. Pool heaters, cleaners, and salt chlorine generators are separate loads, and a gas or electric heater will usually dwarf the pump.
Sources
U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A — Average Price of Electricity to Ultimate Customers by End-Use Sector, by StateprimaryJune 2026retrieved 2026-09-11
The physics is unusually favourable to running slowly: pump power falls with the cube of speed, so halving the speed and doubling the run time uses about a quarter of the energy for the same water turnover.
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Methodology
How this calculator works
From horsepower to watts
One horsepower is 746 watts of shaft output, but a motor is not perfectly efficient, so a single-speed pool pump draws roughly 1,250 watts per nameplate horsepower at the wall. That gap is why nameplate ratings consistently understate what a pump costs to run.
Variable-speed pumps use permanent-magnet motors that are more efficient at any speed, and more importantly they run slowly. The affinity laws say flow is proportional to speed while power is proportional to speed cubed — so a pump at half speed moves half the water for an eighth of the power. Running twice as long at half speed achieves the same turnover for about a quarter of the energy.
Season length and turnover
Season length is estimated from your local cooling degree days: year-round in hot climates, about four months where summers are short. You can override it.
We also check whether your run time actually achieves one full turnover of your pool volume, which is the usual circulation target. Many pools run considerably longer than they need to, and that is the cheapest saving available — it costs nothing to change.
Location and data
Where the numbers come from
Location is optional, and we only ask for a ZIP code or a state — never a street address. A ZIP code is matched to its state using published postal prefix ranges, and that state is used to look up labor and price rows in the tables below. If you leave it blank, or your ZIP cannot be matched, the estimate falls back to a national average and says so on the result.
Nothing you enter is transmitted or stored. The calculation runs entirely in your browser, and the only place your inputs appear is in the page URL, so you can bookmark or share a result if you choose to.
primaryJune 2026v2026.06
U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A — Average Price of Electricity to Ultimate Customers by End-Use Sector, by State
Residential sector average retail price. State averages blend all utilities and rate classes in the state; an individual household bill can differ substantially, especially in deregulated markets and for customers on time-of-use tariffs.
These are the figures we chose rather than measured. For each one we record the range of values found across references, what we selected, and why — because an estimate you cannot interrogate is not much better than a guess. The 0 marked high risk are the ones most likely to be wrong and most consequential when they are.
Variable-speed pump power factor at typical run speedmedium confidence+
Observed range
0.1 — 0.3 (typical 0.16)share of full-speed power
Why this value
The affinity laws give power proportional to the cube of speed, so a pump at half speed draws one eighth the power. Real installations run between 40% and 60% of full speed depending on plumbing restriction and filter condition, giving 0.06 to 0.22; we selected 0.16 for variable speed and 0.28 for two-speed low. The comparison in the calculator also lengthens variable-speed runtime to deliver equal turnover, so the saving shown is not an artefact of comparing unequal work.
Applies to
Not regionally variable.
Known limits
No additional limitation recorded.
Sources
Recorded before the richer schema; see rationale for provenance
Last verified
2026-07-31 · reviewed biennial
Pool pump input watts per nameplate horsepowermedium confidence+
Observed range
1050 — 1450 (typical 1250)watts per HP
Why this value
One horsepower is 746 W of shaft output; an induction motor at 55-70% overall efficiency draws 1,050-1,350 W at the wall, and service-factor-rated motors draw more still. Permanent-magnet motors in variable-speed pumps are more efficient, so they use the lower 1,180 figure. This is the best-understood assumption in the registry because it follows from motor physics rather than market pricing.
Applies to
Not regionally variable.
Known limits
No additional limitation recorded.
Sources
Recorded before the richer schema; see rationale for provenance
Last verified
2026-07-31 · reviewed biennial
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Cost factors
What changes the price most
Pump type
The dominant factor. A variable-speed pump can cut running cost by 70% or more for the same turnover.
Run time
Directly proportional. Most pools need one turnover a day, not continuous circulation.
Motor size
An oversized pump costs more every hour it runs and rarely improves water quality.
Season length
A year-round pool in Florida costs roughly three times a four-month northern season.
Electricity rate
Pool pumps run for long hours, so rate differences compound heavily.
Plumbing restriction
Not modeled. Undersized pipes and dirty filters make the pump work harder for less flow.
Questions
Frequently asked
How much does it cost to run a pool pump?
+
A 1.5 HP single-speed pump running eight hours a day for a six-month season uses roughly 2,700 kilowatt-hours, about $490 at the national average rate. The same pool served by a variable-speed pump typically costs well under $200. In a year-round climate with expensive power, a single-speed pump can exceed $1,500 a year.
Is a variable-speed pool pump worth it?
+
Usually yes, and the payback is often two to four years. Power falls with the cube of speed, so running slowly for longer achieves the same turnover for a fraction of the energy. Federal efficiency standards now require variable speed for most new residential pumps anyway.
How many hours a day should I run my pool pump?
+
Enough for roughly one full turnover of the pool volume. For most residential pools with an appropriately sized pump that is six to eight hours in summer and less in cooler months. The turnover figure above tells you what your specific setup needs — many people run far longer than necessary.
Is it cheaper to run the pump at night?
+
If you are on a time-of-use tariff, substantially. Overnight rates can be a third of afternoon peak rates. Circulation does not care what time of day it happens, though running during daylight helps chlorine distribution in a salt pool, so split the schedule if you can.
Does a bigger pump clean the pool better?
+
Generally no. Beyond what the filter and plumbing can handle, extra horsepower produces more heat and noise rather than more filtration, and it costs more every hour. Right-sizing the pump to the pool and plumbing matters far more than raw power.