How to Use This Calculator
- Enter your House Type to help estimate your heating needs based on typical square footage.
- Specify the number of Heating Months Per Year that you actually use gas for (this varies by climate).
- Input your Average Daily Gas Usage in therms. If you don't know this, check your gas bill for average daily usage.
- Enter the current Gas Price per therm. This can vary by region and time of year.
- Adjust the Efficiency Factor if your heating system is older or less efficient (values above 1.0 indicate less efficient systems).
- Click the Calculate button to see your estimated monthly and annual gas costs.
Understanding the Results
The calculator provides three key insights:
- Daily Cost: Your estimated gas expense per day
- Monthly Cost: Your estimated gas expense for the current month
- Annual Cost: Your estimated yearly gas expense
Formula Explained
The calculator uses the following formula:
Monthly Cost = (Daily Usage × Heating Months × Gas Price) ÷ Efficiency Factor
This formula calculates your gas cost by multiplying your daily usage by the number of heating months and the cost per therm, then adjusting for system efficiency.
Practical Tips
Use this calculator to:
- Estimate your winter heating costs
- Compare different house types
- Identify potential savings from efficiency improvements
- Plan your budget for heating expenses