Sauna Design & Build Calculators
Free, practical tools for planning a home sauna — size a heater, plan bench space, order cladding, understand löyly, time a session, and weigh the build cost before you commit.
Sauna Heater Size Calculator
Turn your room's length, width, and height into a recommended heater output in kilowatts, with allowances added for glass walls and glass doors.
Sauna Bench-Space Planner
Work out the linear bench length you need from your bather count, seated or lounging style, and whether you're building one tier or two.
Cladding Board-Feet Calculator
Get the wall and ceiling surface area, minus the door, plus a waste allowance, converted into board feet of interior paneling to order.
Löyly Water-to-Steam Calculator
See how many ladles of water convert to steam on the hot rocks, and what share of your room's air volume that steam represents.
Sauna Session Timer
Set your rounds and heat/cool-down minutes to build a full session schedule, then run a live countdown through each phase.
Sauna Build Cost & ROI Calculator
Weigh your build cost and running electricity against what you'd pay for spa visits instead, to see the payback period and 5-year net.