Hot Tub Electricity Cost Calculator
A hot tub's electricity cost is dominated by one thing: keeping the water hot. The heater draws around 5,000 watts, and while it doesn't run constantly, it cycles on regularly to hold temperature — more often in cold weather and with an aging or poorly insulated cover. This calculator estimates what your hot tub costs to keep ready per day, month, and year, so you can see the real price of that standing invitation to soak.
watts × hours × duty ÷ 1000
at your state rate
this appliance
Results update live as you type. For planning and field-check estimates — always verify against applicable standards and equipment ratings.
Hot tub energy: where the costs hide
Unlike most appliances, a hot tub uses energy even when you're not using it — the heater maintains 100–104°F continuously. In mild climates (70°F ambient), a well-insulated 400-gallon tub might cycle the heater 20–25% of the time. In cold climates (20°F ambient), that can reach 60–80%, tripling the electricity cost.
The single best upgrade for hot tub efficiency is a quality insulated cover. A worn or thin cover can account for 30–50% of heat loss. After that, look at water temperature — reducing setpoint by even 2–3°F meaningfully cuts heater run time. Economy mode (dropping to 95°F when not in use and scheduling heat-up before use) can cut monthly costs by 15–25%.
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