Hot tub running cost calculator

Estimate a hot tub's electricity cost for each operating day, the entered year and an average month. Choose measured daily electricity when you have a reading that covers the whole tub. Otherwise, enter heater power, enabled hours, heating-on share and pump use separately.

A whole-tub meter total already includes the equipment it measures. Do not add the heater and pump again in that mode. Check that a shared household meter has not included other appliances. Use records over several representative days if the tub's use changes from day to day.

In the power-and-time mode, the heating-on share is the fraction of enabled hours when the heater actually draws power. It allows for thermostat cycling. Enter the pump's electrical watts and its own hours. Finally, enter how many days the tub operates each year and the matching electricity price.

Daily electricity is the metered total, or heater kW × hours × heating-on share plus pump watts ÷ 1000 × hours. Yearly cost uses the entered number of operating days; the monthly average is the yearly cost divided by 12.

Convert heating-on share once: 50% means 0.5. For example, enabled hours are multiplied by that fraction before calculating heater energy. Pump watts are divided by 1000 to obtain kilowatts. Kilowatts describe power; kilowatt-hours, or kWh, describe the electricity used over time.

Multiply daily kWh by the electricity price in cents per kWh, then divide by 100 to obtain dollars. Multiply by your operating days for the annual total. Dividing that total by twelve gives an average month, even if the tub runs for only part of the year. The result shows the power-and-time or metered basis used.

These illustrative inputs are separate from your saved answers. Prices, use and performance are held constant for this worked scenario; they are not personal defaults.

Use consumption measured in conditions that match your scenario: water temperature, outdoor conditions, cover use and how often people use the tub. The calculator does not predict weather-related heat loss or apply a generic insulation factor.

Heater enabled time is not always heating time. Use an assessed heating-on share, or a measured average power with a 100% share. Reducing both power and heating-on share for the same cycling effect would undercount energy. Pump hours are counted independently because pumps may run when the heater is off.

The estimate holds daily use and price unchanged across the entered operating days. It excludes fixed supply charges, water, chemicals, maintenance, repairs and purchase cost. It is not a full ownership budget. Money is rounded only for display. Missing personal values do not become zero; enter zero explicitly where it applies. An incomplete edit preserves the last valid estimate with a warning.

The published electricity option uses EIA state residential averages for July 2026, released on 24 September 2026 and checked on 14 October 2026. These describe past average prices. They are not your supplier's offer or a promise of future prices. Choose your bill price for a personal comparison. Include the taxes and usage charges that change with consumption; keep fixed account charges separate.

Ask the tub maker or a qualified service technician to help identify electrical input and normal control schedules for your model. An energy adviser can help interpret meter readings that mix the tub with other household loads.

Use a qualified electrician or installer for supply, wiring or equipment changes. Keep water treatment and safe operating requirements separate from cost choices. The estimate does not check circuit capacity, electrical protection, water quality or whether reducing a pump schedule is suitable for your tub.