Measure twice, shortlist once
Sauna room volume calculator.
Calculate the finished air volume of a rectangular sauna. Then add every manufacturer-specified heat penalty and use the current heater manual—not a generic web ratio—to make the final selection.
Finished room volume294 ft³8.33 m³
Planning tool, not an equipment specification. Vaults, recesses, glass, masonry, logs, climate, insulation, stone height, bench layout, and model design can change the answer. Your current manual, installer, and local authority control.