Check the gas appliances you use, pick your state, and see roughly what your monthly gas bill should look like — using real 2026 EIA state-average therm prices.
Furnace/boiler usage is a heating-season average — actual use swings hugely with climate, home size and insulation. Set it to 0 outside heating season.
Many utilities also use declining-block or seasonal rate tiers — this uses a single flat rate, so treat it as a solid ballpark, not a bill-exact prediction.
Add up the therms each gas appliance uses per month, multiply by your state's average price per therm, and add the fixed monthly charge most gas utilities bill regardless of usage. A therm is 100,000 BTU — the standard US residential gas billing unit — and a typical 80,000-BTU furnace burns roughly one therm per 75 minutes of continuous full-output operation.
EIA data for early 2026 put the US average residential price at roughly $1.45/therm, but state averages ranged from about $0.80/therm in Wyoming to $5.21/therm in Hawaii — a 6x spread. That gap comes mostly from each local distribution company's fixed pipeline and infrastructure costs, not from wholesale gas prices, which are broadly similar across the country.
A therm is 100,000 British Thermal Units (BTU), the standard billing unit for residential natural gas in the US. A typical 80,000-BTU furnace burns roughly one therm per 75 minutes of continuous full-output run time.
According to EIA data, US residential natural gas prices ranged from about $0.80/therm in Wyoming to $5.21/therm in Hawaii in early 2026 — a roughly 6x spread driven mainly by each local distribution company's fixed infrastructure costs, not wholesale gas prices, which are broadly similar nationwide.
Gas usage for heating varies enormously with climate, home size, insulation and thermostat settings, and most utilities also charge a fixed monthly customer charge on top of usage — this tool estimates usage-based cost only, as a ballpark, not a bill-exact prediction.