Water Heating · West
Cost to run a hot tub in Montana
At Montana’s average residential rate of 15.57¢ per kWh, a hot tub drawing 1500W for 24 hours a day, at a 25% duty cycle, costs about $42.66 per 30.44 use days. Change the numbers below to match how you actually use yours.
Hot Tub electricity cost calculator
Use watts and running time, or enter energy from a label, meter or completed load. Your inputs stay on this device.
Enter a number within each field’s limits to calculate your cost.
Your estimated energy cost
3,285 kWh across 365 use days per year
Power mode includes your selected duty cycle. The monthly figure assumes 30.44 use days; the annual total uses your selected use days. These are estimates at the entered rate.
Energy charges only. Fixed utility fees, purchase, installation and maintenance are excluded. See the calculation method and sources.
Why the cost differs in Montana
Montana has the 19th cheapest residential electricity of the 50 US states and Washington, DC we track, at 15.57¢ per kWh against a national average of 18.16¢. That is -14.3% compared with the national figure. Montana combines hydroelectric and wind generation with the lowest population density outside Alaska and Wyoming, which cuts both ways: cheap generation, but long transmission runs to few customers. Retail service is largely regulated. Winter heating dominates by a wide margin, and the heating season is long enough that space heating choices matter more here than almost anywhere.
For this appliance specifically, the difference works out to a saving of $85.08 a year against what the same hot tub would cost at the national average rate. Run the identical appliance in Hawaii and it would cost $1,550 a year; in Nevada it would cost $418. That spread of $1,132 is entirely down to location.
Reducing use by 100 kWh would save $15.57 in energy charges at Montana's average rate, compared with $18.16 at the US average. Whether a replacement appliance pays for itself also depends on its purchase price and the energy it actually saves.
Use the energy and delivery price that applies to your own utility plan in Montana. If your plan has time-of-use prices, calculate each period separately or use a rate weighted by the electricity used in each period. Fixed monthly fees are outside this appliance energy-cost estimate.
| Location | Rate | Per month | Per year |
|---|---|---|---|
| Montana this page | 15.57¢ | $42.66 | $511 |
| US average | 18.16¢ | $49.75 | $597 |
| Nevada cheapest state | 12.72¢ | $34.85 | $418 |
| Hawaii most expensive | 47.18¢ | $129 | $1,550 |
Montana electricity rate trend
Rates in Montana have moved from 14.64¢ to 15.57¢ per kWh between September 2025 and August 2026. The national residential average changed +3.4% from the same month a year earlier.
2025-09 to 2026-08 · cents per kWh
About running a hot tub
Maintaining temperature year-round makes a hot tub one of the most expensive appliances a household can own, often exceeding the refrigerator several times over. Cover quality is the dominant cost variable.
How we worked this out
The arithmetic is simple and we would rather show it than hide it. Divide watts by 1,000 to get kilowatts, multiply by hours of use and by the duty cycle to get kilowatt-hours, then multiply by your rate:
1500W ÷ 1000 × 24h × 25% = 9.000 kWh/day × 15.57¢ = $1.401 per day
One honest caveat: Montana’s figure is a state average published by the EIA. Your own utility’s tariff, any time-of-use pricing, fixed monthly service charges and local taxes all shift the real number. Put your actual per-kWh rate into the calculator above for a figure that reflects your bill.
How to estimate your hot tub electricity use
A hot tub can use energy for heating, circulation, filtration and jets. The heater rating alone does not describe total daily electricity use or how often the heater runs.
The preset does not model heat loss, climate or every pump. Water, chemicals and maintenance are excluded from this electricity estimate.
- Use whole-unit measured daily kWh if available. Otherwise estimate the heater and pumps separately and add their energy.
- For an illustrative 10 kWh/day at $0.20/kWh, the electricity cost is $2/day. This is a scenario, not a typical-use claim.
- Outdoor temperature, cover condition, set temperature and bathing use can change daily energy. A summer measurement is not automatically representative of winter.
- Initial heating after a refill differs from maintaining temperature. Include refill heating separately if estimating an annual total.
Calculation and data sources
Daily kWh = watts ÷ 1,000 × hours × duty cycle ÷ 100. Multiply kWh by your rate in dollars per kWh to get cost. The wattage, hours and duty cycle above are editable example assumptions, not EIA measurements of this appliance.
The US and state average prices come from the EIA for August 2026. A state average is a starting point; your bill is the better source for your tariff.
Questions about hot tub running costs
How much electricity does a hot tub use?
In this example, 1500 watts at a 25% duty cycle uses 0.375 kWh per scheduled hour. At 24.00 hours per day, that is 9.000 kWh per use day. Your model and operating conditions can differ.
How much does it cost to run a hot tub for an hour?
The default example costs $0.058 per scheduled hour at the Montana average of 15.57¢/kWh for August 2026. This includes the selected duty cycle. Enter your watts, duty cycle and electricity price for your own estimate.
Does the annual cost assume I use it every day?
The reference tables use 365 days at the stated daily hours; monthly figures use 30.44 days. These are comparison scenarios, not forecasts. For a heater used on 90 days, enter 90 use days per year in the calculator.
Why does electricity running cost vary by state?
For August 2026, the EIA state averages range from 12.72¢/kWh in Nevada to 47.18¢/kWh in Hawaii. Equal electricity use costs more at a higher rate. Your utility tariff can differ from the state average.
Should I enter rated watts or average watts?
Use the input that matches your measurement. Rated watts can represent maximum draw. If you know the average watts over the selected hours, enter that average and set duty cycle to 100%; do not reduce it again for cycling.
Does this include the purchase price?
No. This calculator estimates electricity at the entered usage-based rate. Purchase, installation, maintenance and fixed monthly utility charges are separate.
How do I estimate occasional use?
In watts-and-hours mode, enter the hours used on an active day, then select the number of use-days per year. The monthly figure remains a 30.44-day equivalent at that daily use; the annual figure uses your selected days.