Calculators

Focused sauna calculators — heater kW sizing, room volume, bench step geometry, stone replacement timing. Each answer is reproducible from the cited formula.

• Electric heater kW sizingFind the right kW heater for your sauna — instant sizing based on room volume, materials, and insulation.
• How big a sauna do I need for 4 peopleSizing guidance for a sauna that fits 4 people — bench length, room volume, and matching heater output.
• Bench step geometryBench step geometry calculator — safe, comfortable upper-bench heights, step depth, and clearance for your sauna.
• Stone replacement schedulerSchedule sauna stone replacement based on heater type, usage hours, and stone material — never let löyly quality drop.