About this calculator

Rule of thumb: 1 kW of heater per 1 m³ of well-insulated sauna, +2 kW per exterior wall or window. Load ~6 kg of peridotite stones per kW.

Frequently asked questions

What does the Sauna Heater kW Sizing do?

Kiuas (sauna heater) kW rating and stone weight from cabin volume. Rule of thumb: 1 kW of heater per 1 m³ of well-insulated sauna, +2 kW per exterior wall or window. Load ~6 kg of peridotite stones per kW.

Is the Sauna Heater kW Sizing free to use?

Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Sauna Heater kW Sizing?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified home sauna build professional before committing to a purchase or a job.

What inputs does the Sauna Heater kW Sizing need?

Enter values for: Length (m), Width (m), Height (m), Exterior walls / windows. Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Sauna Heater kW Sizing on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.