Hot Tub Cost Calculator

The average hot tub costs between $20 and $100 per month to run, depending on its size, insulation, your local electricity rate, and how often you use it. A well-insulated 6,000W hot tub used 1 hour daily at $0.17/kWh costs roughly $30–$50 per month. This calculator gives you a personalised estimate based on your actual inputs.

Hot tubs draw significant power — often 1.5 to 6+ kW — not just when you're soaking, but continuously to maintain water temperature. If your hot tub is poorly insulated, set to a high temperature, or located in a cold climate, it can consume 150–300 kWh per month, which can noticeably increase your bill. Adding a well-fitted insulating cover is one of the most effective ways to reduce standby energy use.

Check your hot tub's owner's manual or the specification label on the unit itself. Most standard acrylic hot tubs range from 3,000W to 7,500W, while large swim spas can exceed 10,000W. Inflatable hot tubs are typically lower, around 1,000–1,500W. Your electricity bill or a smart plug energy monitor can also measure actual consumption.

Your electricity rate (cost per kWh) is shown on your monthly utility bill — look for a line-item rate or the total kWh used divided into your energy charge. US rates average around $0.17/kWh but vary from $0.10 in some states to over $0.25/kWh in others. UK users average around £0.28/kWh and EU users around €0.30/kWh.

Yes. Hot tubs continuously consume electricity to maintain the set water temperature, run the filtration cycle, and power controls. This standby power draw is often 1,000–2,000W for a standard tub and can account for the majority of your monthly hot tub electricity cost, especially if you don't use it every day.

Key strategies include: using a high-quality insulating cover whenever the tub is not in use, lowering the set temperature by a few degrees (each degree saves roughly 10% in heating energy), scheduling heating during off-peak electricity hours, ensuring the tub's insulation is in good condition, and upgrading to a more energy-efficient model if your current tub is older.

Generally yes — larger tubs hold more water, which requires more energy to heat and maintain temperature. However, insulation quality, cover thickness, climate, and set temperature matter just as much as size. A large, well-insulated modern tub can sometimes cost less to run than an older, poorly insulated smaller model.

Hard-shell acrylic hot tubs with full-foam insulation and a tight-fitting cover are typically the most energy-efficient. Look for models certified by the California Energy Commission (CEC) or with an Energy Star rating. Inflatable hot tubs, while cheaper upfront, tend to lose heat faster and can cost more to run despite their lower wattage.