How does the Heating Cost Calculator work?
This calculator models electric heating equipment by converting total wattage and operating time into kWh, adjusting for duty cycle, and multiplying by your electricity rate. For a basic single-load calculation, the Electricity Cost Calculator uses fewer inputs.
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How should you estimate heating duty cycle?
Duty cycle is the share of scheduled time the equipment is modeled as drawing its entered power. Real cycling depends on weather, thermostat settings, insulation and equipment controls. To compare cooling loads using a similar method, use the Air Conditioner Energy Cost Calculator.
What does the monthly heating cost represent?
The main result is the modeled electricity charge for the entered period, not a complete utility bill. The Electricity Bill Calculator can add fixed charges, while the Home Energy Cost Calculator combines electricity and natural-gas spending.
What types of heating are not modeled directly?
This version is designed for electric heating input power. Natural gas, propane and heating oil use different fuel units and equipment-efficiency assumptions. Use actual fuel-bill data in the Home Energy Cost Calculator when you need a combined household view.
Worked example: Heating Cost
Enter the following values in the Heating Cost Calculator and calculate to reproduce this result.
- Power per heating unit: 1500
- Number of units: 1
- Scheduled hours per day: 6
- Days in period: 30
- Average duty cycle: 70
- Electricity rate: 0.18
Example result: $34.02. 1 heating unit use about 189 kWh over 30 days under the entered duty-cycle assumption.
Calculation used: cost = watts × units ÷ 1,000 × hours/day × days × duty cycle × rate
How to interpret this example
The entered duty cycle scales operating time; it is not a measurement of heating efficiency or building heat loss. Use actual consumption data where available. Comparing different fuels or heat pumps may require efficiency and tariff information not captured by a simple wattage model.
Frequently asked questions about Heating Cost
Yes. It estimates electricity use and cost from heating equipment wattage, quantity, operating time and duty cycle.
Yes. Enter the heater wattage, count, hours, days, duty cycle and electricity rate.
It can model measured or representative electrical input power, but heat-pump power varies with conditions and operating mode.
No. The formula is electricity-based.
It is the percentage of scheduled time the calculator assumes the heating equipment is drawing the entered electrical power.
No. It estimates the energy charge associated with the modeled heating load.
Weather, thermostat settings, building insulation, air leakage, equipment condition and utility rates can all change.
Yes. Keep the schedule and electricity rate constant and compare the power draw, quantity and duty-cycle assumptions.
Sources and methodology
The calculator uses the transparent formula described on this page and the values you enter. These authoritative U.S. resources provide context for electricity, home energy, solar, efficiency or safety topics related to this tool.