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Home Sauna Electricity Cost Calculator

Reviewed for 2026, updated September 8, 2026.

Estimates what each session, month and year of running an infrared or electric cabin sauna adds to a household electricity bill.

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Results update as you type.

Your estimate

Energy per session...
Cost per session...
Monthly electricity cost...
Annual electricity cost...

Estimates only. Assumptions are listed below, and you can change every input.

A heater rating on a spec sheet says very little about what a sauna costs to run. A 2 kW infrared cabin does not draw 2 kW for the whole session, warm-up can take ten minutes or the better part of an hour, and the answer depends entirely on how many evenings a week the sauna is actually used. Someone weighing a 5,000 USD infrared cabin against a 12,000 USD traditional room deserves a clearer figure than "pennies per session".

The calculator multiplies the heater rating by the minutes it runs flat out during warm-up, then adds the session itself at the duty cycle you specify, because most heaters cycle on and off once the cabin reaches temperature. Multiply by your sessions per week and the rate on your utility bill and you get a cost per session, per month and per year. It is an estimate rather than a meter reading: insulation, room temperature, door openings and the thermostat set point all move the real number.

How to use this tool

  1. Enter the heater rating in kW from the cabin spec sheet, then the warm-up time and session length you actually plan to use.
  2. Set the duty cycle to reflect how hard the heater works once the cabin is hot, and enter your sessions per week.
  3. Type the per kWh rate from your electricity bill and read the cost per session, per month and per year.

What the math assumes

  • The heater draws its full rated power for the entire warm-up period.
  • Once at temperature the heater draws power only for the duty cycle share of the session. The 60% default is a placeholder, not a measured figure; a well insulated cabin in a warm room will cycle less, a drafty one more.
  • The default rate of 0.17 USD per kWh is a placeholder. Replace it with the all-in rate from your own bill, including delivery and taxes.
  • Lighting, chromotherapy, audio and the controller are ignored because they draw a small fraction of what the heater does.
  • A month is treated as 52/12 weeks, so four sessions a week comes to about 17.3 sessions a month.

Frequently asked questions

Why does the calculator ask for a duty cycle instead of just using the heater rating?

Once a sauna reaches its set temperature the thermostat switches the heater off and on to hold it there, so the average draw is lower than the nameplate rating. The duty cycle lets you model that instead of overstating the cost.

Does an infrared sauna really cost less to run than a traditional electric cabin?

Usually the per session cost is lower because infrared cabins carry smaller heaters and need far less warm-up time, but the difference shrinks if you run long sessions or sit in a cold garage. Enter both configurations and compare the annual figures rather than trusting a rule of thumb.

Should I include the warm-up time if I sit inside while it heats?

Yes. The heater is at full power during warm-up whether or not you are inside, so count those minutes as warm-up and count only the time at temperature as the session.

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