Sauna and Cold Plunge Calculators
Free calculators that show their math. Each cites where its rules and default numbers come from.
- SaunasSauna Heater Size CalculatorEnter your sauna room size, glass area and wall type to get the minimum heater kW using Harvia and HUUM's rule, with the math shown and matching heaters.
- SaunasSauna Running Cost CalculatorEstimate what your sauna costs to run per session, per month and per year from heater kW, sessions per week, preheat time and your local electricity rate.
Shopping now? Start with the home sauna buyer's guide or thecold plunge buyer's guide.