Analyze fuel prices, efficiency, and heat output side by side. Measure annual demand with confidence. Find the most economical heating option for your space.
| Fuel | Unit | Sample Price | Heat Value | Sample Efficiency | Emissions Factor |
|---|---|---|---|---|---|
| Natural Gas | Therm | 1.40 | 100,000 BTU | 92% | 5.30 kg |
| Heating Oil | Gallon | 4.25 | 138,500 BTU | 85% | 10.21 kg |
| Propane | Gallon | 2.75 | 91,500 BTU | 88% | 5.72 kg |
| Electricity | kWh | 0.16 | 3,412 BTU | 100% | 0.39 kg |
Useful BTU per unit = Heat Value per Unit × (Efficiency ÷ 100)
Gross Cost per MMBTU = Price per Unit ÷ (Heat Value per Unit ÷ 1,000,000)
Useful Cost per MMBTU = Price per Unit ÷ (Useful BTU per Unit ÷ 1,000,000)
Units Needed = Seasonal Heat Demand ÷ Useful BTU per Unit
Seasonal Cost = Units Needed × Price per Unit
Seasonal Emissions = Units Needed × Emissions Factor
Heating costs affect comfort and budgeting. Fuel prices move often. Equipment efficiency matters too. A lower sticker price does not always mean a lower heating bill. This calculator compares fuels using consistent energy math. It converts raw fuel input into useful delivered heat. That gives a fair basis for comparing common heating options.
Each fuel entry uses four core inputs. You enter fuel price, heat value, appliance efficiency, and emissions factor. The tool then calculates useful BTUs per unit, gross cost per million BTUs, and useful cost per million BTUs. If you add a seasonal heat demand, it also estimates units required, total seasonal cost, and total emissions. This creates a practical side by side fuel ranking.
Raw BTU content only shows potential energy. Real systems lose some of that energy during combustion, exhaust, cycling, or distribution. Useful heat is what actually warms the building. That is why a fuel with a lower price can still become expensive after efficiency losses. Comparing useful cost per million BTUs produces a stronger decision metric for real world heating analysis.
This page can support home energy reviews, rental property planning, and small building operating studies. You can compare natural gas, heating oil, propane, electricity, wood pellets, or other local fuels. Change inputs as prices change. Test higher efficiency equipment. Measure how much seasonal demand affects annual cost. Small efficiency gains can create meaningful savings over a full heating season.
The output is best used for planning, not final billing. Real costs may include taxes, delivery fees, meter charges, maintenance, weather swings, and regional supply limits. Emissions may also vary by supplier and grid mix. Use the calculator to narrow your options, then confirm the final numbers with current utility tariffs, supplier quotes, and equipment specifications before making a purchase decision today. Use it often during annual heating budget reviews.
Normalized comparison also improves communication. Contractors, property managers, and homeowners can discuss the same numbers clearly. When every fuel is converted to useful heat cost, tradeoffs become easier to explain, document, and review later.
Fuel price alone ignores energy content and system efficiency. Useful cost includes both. That makes the comparison fair across fuels with different heat values and equipment performance.
MMBTU means one million BTUs. It is a standard energy unit. It helps compare fuels on the same heat basis, even when they are sold in different units.
Yes. Enter electricity price per kWh, the heat value per kWh, and the equipment efficiency. The calculator converts everything into comparable useful heat figures.
Use an estimate from past utility bills, an energy audit, or a heating load study. A realistic seasonal demand improves the annual cost and emissions results.
No. The calculator focuses on direct fuel math. Add those extra costs into your price per unit manually if you want a closer estimate.
Each fuel has a different carbon intensity per unit. Electricity can also vary by grid source. The emissions factor field lets you use local or supplier specific values.
Yes. Blank rows are ignored. The calculator only processes rows that contain valid values. Use at least two completed rows for a meaningful comparison.
Yes. It helps compare old and new systems by changing efficiency assumptions. That makes it useful for upgrade studies, equipment replacement, and budget planning.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.