How to Estimate Your Monthly Gas Bill
This calculator uses approximate US residential natural gas rates: $1.50 per therm, a $15 fixed monthly charge, and 5% tax. One therm equals 100,000 BTU or approximately 29.3 kWh of energy. The average US household uses 40–80 therms per month in winter for heating, and 5–15 therms in summer for water heating and cooking.
Natural gas rates vary significantly by state and utility provider. States like Louisiana and Oklahoma typically have lower rates, while states like California and Hawaii have higher costs. Rates also change seasonally and with fluctuations in wholesale natural gas prices.
For accurate billing information, check your utility provider's website or your monthly statement. This tool is intended for estimation and planning purposes only.
Frequently Asked Questions
A therm is a unit of heat energy equal to 100,000 BTU (about 29.3 kWh). US gas utilities typically charge in therms or CCF (hundred cubic feet, roughly 1.02 therms).
These are approximate US averages. Actual rates vary by utility, state, and season. Check your utility bill or provider website for exact figures.
Lower your thermostat, improve insulation, and service your furnace. A programmable thermostat alone can cut heating costs by 10–15%.