Radiant Heat Flooring Calculator

Estimate the total wattage, daily energy use, and monthly operating cost of an electric radiant heat floor system.

Monthly Cost
per month
At $0.13 per kWh.

Usage Tip

A floor thermostat with a timer cuts cost by heating only when the room is in use. Count only the actual heated area, not the whole room.

THE MATH
total watts = area × rating
daily kWh = total watts × hours ÷ 1000
monthly cost = daily kWh × 30 × $0.13
Electric radiant floor mats warm a room from the floor up.
Energy use is the system wattage times how long it runs, and cost follows from your electricity rate.
Enter the heated area, the system rating in watts per square foot (8 to 15 is typical), and daily run hours.
Cost assumes $0.13 per kWh; scale the result for your own rate.
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.