Propane vs Electric Heat Cost Calculator
Determine your potential heating costs and compare the affordability of propane and electric systems. This powerful propane vs electric heat cost calculator uses up-to-date energy values to give you an accurate financial picture for your home heating decisions.
Enter the current cost of one gallon of propane in your area.
Please enter a valid positive number.
Enter your cost per Kilowatt-hour from your utility bill.
Please enter a valid positive number.
Annual Fuel Utilization Efficiency. Modern furnaces are typically 90-98%.
Please enter a valid percentage (1-100).
Electric resistance heat is 100%. Heat pumps can be 200-400%.
Please enter a valid percentage.
Average for a 2000 sq ft home in a moderate climate is 50-80 MMBTU.
Please enter a valid positive number.
Propane Annual Cost
$0.00
Electric Annual Cost
$0.00
Propane Cost per MMBTU
$0.00
Electric Cost per MMBTU
$0.00
| Metric | Propane | Electric |
|---|---|---|
| Annual Cost | $0.00 | $0.00 |
| Cost per Million BTU (MMBTU) | $0.00 | $0.00 |
| Effective BTUs per Fuel Unit | 0 | 0 |
This table breaks down the core cost components for each heating source based on your inputs.
Visual comparison of the estimated annual heating costs.
What is a Propane vs Electric Heat Cost Calculator?
A propane vs electric heat cost calculator is a financial tool designed to help homeowners and property managers compare the operating expenses of two common heating systems: those powered by propane gas and those powered by electricity. The calculation hinges on a unit of heat energy called the British Thermal Unit (BTU). By analyzing the price per unit of fuel (gallons of propane vs. kilowatt-hours of electricity), the energy content of that fuel, and the efficiency of the heating appliance, the calculator provides an “apples-to-apples” cost comparison. This empowers users to make informed decisions based not just on fuel price, but on the true cost to generate a specific amount of heat in their home. Anyone considering a new HVAC system or looking to understand their current energy bills can benefit from using this type of energy cost calculator.
Propane vs Electric Heat: The Formula and Mathematical Explanation
To accurately compare heating costs, we can’t just look at the price per gallon versus the price per kilowatt-hour. We must determine the cost per a standard unit of heat, typically one million BTUs (MMBTU). The propane vs electric heat cost calculator automates this, but the underlying formula is straightforward.
Step-by-Step Derivation:
- Calculate Effective BTUs per Fuel Unit: This accounts for the appliance’s efficiency.
- Effective Propane BTUs = BTUs per Gallon × (AFUE / 100)
- Effective Electric BTUs = BTUs per kWh × (Efficiency / 100)
- Calculate Cost per Million BTUs (MMBTU): This is the key to a fair comparison.
- Propane Cost per MMBTU = (1,000,000 / Effective Propane BTUs) × Price per Gallon
- Electric Cost per MMBTU = (1,000,000 / Effective Electric BTUs) × Price per kWh
- Calculate Total Annual Cost: This applies the unit cost to your home’s heating needs.
- Annual Cost = Annual Heating Needs (in MMBTU) × Cost per MMBTU
Variables Table
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| BTU per Gallon | Energy content of propane. | BTU | ~91,500 |
| BTU per kWh | Energy content of electricity. | BTU | ~3,412 |
| AFUE | Annual Fuel Utilization Efficiency for propane furnaces. | Percentage (%) | 80 – 98 |
| Electric Efficiency | Efficiency of electric heaters (resistance or heat pump). | Percentage (%) | 100 – 400 |
| Heating Needs | Total heat required for a home over a year. | Million BTUs | 40 – 120 |
Practical Examples (Real-World Use Cases)
Example 1: Suburban Home with Moderate Climate
A family in a 2,200 sq. ft. home has a 96% AFUE propane furnace. Their annual heating need is 65 MMBTU. Propane costs $2.75/gallon, and electricity is $0.14/kWh.
- Propane Cost per MMBTU: $31.28
- Electric (Resistance) Cost per MMBTU: $41.03
- Annual Propane Cost: $2,033.20
- Annual Electric Cost: $2,666.95
Interpretation: In this scenario, using the propane furnace saves the family over $600 per year compared to standard electric resistance heating, making it the clear financial winner. Using a propane vs electric heat cost calculator confirms their choice.
Example 2: Rural Home with Cold Climate & Heat Pump
A homeowner in a colder region has an older home requiring 90 MMBTU annually. Propane is cheaper at $2.20/gallon. However, they are considering installing a new cold-climate heat pump with an average efficiency of 250%. Electricity is expensive at $0.20/kWh.
- Propane (90% AFUE) Cost per MMBTU: $26.70
- Electric (Heat Pump) Cost per MMBTU: $23.45
- Annual Propane Cost: $2,403.00
- Annual Electric Cost: $2,110.50
Interpretation: Despite the high electricity rate, the incredible efficiency of the modern heat pump makes it the cheaper option by nearly $300 per year. This demonstrates why appliance efficiency is as important as fuel price, a key takeaway from any HVAC cost analysis.
How to Use This Propane vs Electric Heat Cost Calculator
This tool is designed for simplicity and accuracy. Follow these steps to get a clear comparison:
- Enter Fuel Prices: Start by inputting your local price for propane ($/gallon) and electricity ($/kWh). Find this on your most recent utility bills.
- Input Appliance Efficiencies: Enter the efficiency rating for your propane furnace (AFUE) and your electric system. For standard electric baseboards, this is 100%. For heat pumps, it could be 200% or higher.
- Estimate Annual Heating Needs: Input your home’s estimated annual heating demand in Million BTUs (MMBTU). If you don’t know this, the default value is a reasonable starting point for an average home.
- Review the Results: The calculator instantly updates. The primary result highlights which fuel source is more economical. The intermediate values, table, and chart provide a detailed breakdown of the annual costs and cost per unit of heat.
Decision-making: Use the “Annual Cost” figures as your primary guide for budgeting. The “Cost per MMBTU” figures tell you the true, efficiency-adjusted cost of your energy, which is crucial when comparing different heating technologies like those in our HVAC sizing calculator.
Key Factors That Affect Heating Cost Results
The results from a propane vs electric heat cost calculator are influenced by several dynamic factors. Understanding them is key to managing your energy expenses.
- Local Fuel and Electricity Prices: This is the most significant factor. Propane prices can fluctuate based on supply and season, while electricity rates are set by utility commissions but can have tiered pricing.
- Appliance Efficiency: A 98% AFUE propane furnace is vastly more cost-effective than a 80% AFUE model. Similarly, a high-efficiency heat pump (250%+ efficient) fundamentally changes the calculation compared to 100% efficient electric baseboards.
- Climate and Weather Severity: The colder your climate, the higher your annual heating needs (MMBTU), amplifying the cost difference between the two fuel sources. Severe winters can strain supply lines, affecting prices.
- Home Insulation and Air Sealing: A well-insulated and sealed home requires fewer BTUs to heat, lowering the total cost regardless of the fuel source. This is a foundational concept in understanding BTU requirements.
- System Type (Resistance vs. Heat Pump): Lumping all “electric heat” together is a mistake. Electric resistance heating is always 100% efficient, but a heat pump doesn’t create heat—it moves it. This allows it to achieve efficiencies over 100%, making it far more competitive with propane.
- Maintenance and Lifespan: While not part of this calculator, the long-term cost includes maintenance and eventual replacement. Propane furnaces often have a longer lifespan than electric heat pumps.
Frequently Asked Questions (FAQ)
Yes, particularly when a high-efficiency electric heat pump is used. Even if the per-kWh electricity price is high, a heat pump with 250-350% efficiency can produce a lower cost per BTU compared to a propane furnace, as shown in our second example. Using a propane vs electric heat cost calculator is the only way to know for sure.
Modern high-efficiency propane furnaces have an AFUE rating of 90% to 98%. Anything below 90% is considered standard efficiency. Upgrading from an 80% to a 95% AFUE furnace can save a significant amount on fuel annually.
Look at your electricity bill for the “supply” or “generation” charge, often listed in cents per kWh. Be sure to add in delivery charges to get the total cost. For example, $0.08 (supply) + $0.07 (delivery) = $0.15/kWh total rate.
This depends on your home’s size, insulation, window quality, and local climate. A rough estimate is 25-50 BTUs per square foot of living space, but a professional energy audit or a dedicated HVAC sizing calculator provides a more accurate number.
Propane is a commodity, and its price is tied to crude oil and natural gas markets. Prices are also seasonal, often increasing in the winter due to higher demand and potential supply disruptions from weather.
The calculator’s accuracy is directly tied to the accuracy of your inputs. If you use the correct local fuel prices and the correct efficiency ratings for your appliances, the result will be a very reliable estimate of your relative heating costs.
Yes. To use it for a heat pump, enter the pump’s average efficiency in the “Electric Heater Efficiency” field. For example, a heat pump with a HSPF (Heating Seasonal Performance Factor) of 8.8 has an approximate average efficiency of 258% (8.8 / 3.412 * 100). Enter 258.
Absolutely. You can run different scenarios to see which heating system would be most cost-effective over the long term. This propane vs electric heat cost calculator is an essential planning tool before you commit to an HVAC installation.
Related Tools and Internal Resources
Continue exploring your home energy options with our suite of related calculators and guides.
- Gas vs. Electric Dryer Cost Calculator: Apply the same energy cost principles to your laundry room appliances.
- Home Energy Efficiency Guide: Learn actionable tips to reduce your overall energy consumption and save money.
- Electricity Cost Calculator: Get a detailed breakdown of what individual electric appliances cost to run.
- Guide to Propane Tank Sizes: Understand the different sizes of residential propane tanks and which one is right for your home.