Sauna & hot tub calculators
What does yours cost to run? What size heater does the room need? Put your own numbers in and find out.
- Sauna Electricity Cost Calculator
What one sauna session costs, and what that adds up to per month and per year.
- Hot Tub Electricity Cost Calculator
Split your running cost into keeping it hot, the circulation pump, and reheating.
- Hot Tub Heat-Up Time Calculator
How long from cold to ready, and what that one heat-up costs.
- Sauna Heater Size Calculator
Draw your sauna room and get the heater kW range that actually suits it.
Guides
- What a home sauna really costs to run
Why the common "kilowatts times hours" estimate is too high, what a session actually costs, and how to cut it.
- Where a hot tub's electricity goes
Standby heat loss, not bathing, is most of a hot tub's bill. Here's the split, and the three changes that measurably reduce it.
- How sauna heater sizing actually works
The 1 kW per cubic metre rule, why glass and stone break it, and how to read a manufacturer's chart without getting caught out.