Household Energy Tool

Natural Gas Bill Calculator

Estimate your monthly natural gas bill by calculating volumetric usage charges in therms or Mcf, adding fixed account fees, and analyzing all-in cost per unit.

Natural Gas Bill Calculator Inputs

Estimated Monthly Natural Gas Bill Summary

Volumetric Usage Charge

$140.00

Fixed Account Charge

$15.00

Taxes & Fees

$10.00

Estimated Total Monthly Bill

$165.00

Effective Cost per Therm

Your effective all-in cost is $2.0625 per therm ($165.00 total ÷ 80 therms).

Formula Assumptions & Calculation Limits

Formula: Usage Charge = Usage × Price per Unit. Total Bill = Usage Charge + Fixed Charge + Taxes & Fees.

Volumetric natural gas usage is calculated at 80 therms at $1.75 per therm.
Fixed customer account charge is set to $15.00 per billing cycle.
User-entered taxes and rider fees total $10.00.
Actual natural gas bills include local utility distribution rates, weather-normalization adjustments, and seasonal tariff tiers.
EIA state averages represent aggregate retail revenue divided by volume, not a specific local gas utility price schedule.
Gas heat content varies slightly by supplier region (typically 1.02 to 1.05 therms per Ccf / 10.2 to 10.5 therms per Mcf).

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MethodologyTransparent formulas, calculation assumptions, and estimate limitations at Energy Bill Lab.
Data SourcesOfficial U.S. EIA datasets, utility benchmarks, and state energy data sources used by Energy Bill Lab.