Natural Gas Bill Calculator
Estimate a monthly natural-gas bill from therms, commodity and delivery prices, and fixed charges.
Estimate a monthly gas bill
How this calculator works
Gas bills can separate commodity supply, variable distribution, fixed customer charges, taxes, and riders. Enter per-therm prices only for charges that rise with therm use.
This flat-rate model does not reproduce tiered tariffs, weather normalization, budget billing, minimum bills, late charges, or every local rider.
At 60 therms, $0.70 supply, $0.55 delivery, $18 fixed charges, and 5% tax, the estimated monthly bill is $97.65.
How to get a more accurate estimate
- Use the billing-period therm total, not cubic feet unless converted by the utility.
- Separate per-therm charges from fixed service fees.
- Compare usage and weather, not only dollar totals, across months.
Frequently asked questions
What is a therm?
A therm is a unit of heat energy equal to 100,000 British thermal units.
Why are supply and delivery separate?
Supply covers the gas commodity while delivery supports local distribution and service.
Does this handle budget billing?
No. Budget plans smooth payments; compare the estimate with actual usage charges rather than the scheduled payment alone.
Results use the values you enter and the formula shown above. Real bills can include taxes, minimum charges, tiers, time-of-use pricing, cycling losses, and other adjustments. Use a recent bill or a plug-in energy meter when accuracy matters.