Hot tub running-cost calculator.
Turn a daily energy-use figure into a cost you can compare. Your tariff, consumption and water-care allowance stay visible and editable.
Your assumptions
Build your estimate
Pre-filled with Ofgem’s GB Direct Debit average for 1 July to 30 September 2026. Your tariff and region may differ.
Calculated estimate
Your running-cost picture
This is arithmetic, not a performance claim. Weather, water temperature, cover fit, insulation, filtration, bathing and reheating all change consumption. Standing charges are excluded because you pay them for the property regardless of the hot tub.
How to get a more useful answer
The strongest input is measured kWh over a representative week, including normal bathing and filtration. A manufacturer estimate can be a starting point, but ask what air temperature, water temperature, cover use and test standard sit behind it.
What the calculator includes
Electricity is calculated as daily kWh × your pence-per-kWh rate. The monthly figure uses 365 ÷ 12 days. You can add a separate monthly allowance for chemicals, filters and routine consumables. It excludes finance, servicing, repairs, water and the household standing charge.
August 2026 electricity-rate source
The starting rate is Ofgem’s average Direct Debit electricity unit rate for Great Britain from 1 July to 30 September 2026. It includes VAT, but regional rates and individual tariffs differ. Check the official Ofgem table .